CN116108548B - BIM-based road bridge structural strength analysis method and system - Google Patents
BIM-based road bridge structural strength analysis method and system Download PDFInfo
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Abstract
The invention relates to the field of road bridge structure monitoring, and provides a road bridge structure strength analysis method and system based on BIM. The method can comprehensively analyze the structural strength of the road and bridge without manual calculation and judgment, coordinates the stress distribution of each part of the model in the structural strength analysis process, screens out the low-strength area in the road and bridge model, intuitively displays the weaker position in the road and bridge by highlighting the low-strength area, reduces loopholes and errors in the design and construction process in the road and bridge actual construction or maintenance link, and improves the structural safety and stability of the road and bridge.
Description
Technical Field
The invention relates to the field of road and bridge structure monitoring, in particular to a road and bridge structure strength analysis method based on BIM.
Background
Road and bridge structures are vital components of the transportation infrastructure that need to withstand external forces from traffic loads, wind loads, temperature changes, etc. In order to ensure the safety and reliability of the road bridge structure, it is necessary to conduct a strength analysis to evaluate its ability to withstand external forces and predict the possibility of structural failure.
In the past, the strength analysis of road and bridge structures is generally based on empirical formulas and test data, and the method has defects such as insufficient consideration of the actual condition of structural stress, difficulty in predicting structural damage and the like. Along with the development of computer technology, the use of a numerical analysis method to analyze the strength of road and bridge structures is becoming an important research direction. At present, building Information Models (BIMs) based on Computer Aided Design (CAD) and Computer Aided Engineering (CAE) techniques are widely used in road and bridge structural strength analysis. BIM can accurately model three-dimensional structure by converting building structure into digital model, and can conveniently conduct various analysis and optimization. The BIM enables the analysis of the structural strength of the road and bridge to be more accurate, efficient and reliable, greatly improves the design and construction efficiency, and simultaneously ensures the safety and reliability of the structure.
Therefore, the BIM-based road bridge structural strength analysis method has become an indispensable part in modern road bridge structural design and construction. The method can improve the design efficiency and quality, can reduce the engineering cost and risk, and has wide application prospect.
Disclosure of Invention
The invention aims to provide a road bridge structural strength analysis method based on BIM, which aims to solve one or more technical problems in the prior art and at least provides a beneficial selection or creation condition.
The invention relates to the field of road bridge structure monitoring, and provides a road bridge structure strength analysis method based on BIM. The method can comprehensively analyze the structural strength of the road and bridge without manual calculation and judgment, coordinates the stress distribution of each part of the model in the structural strength analysis process, screens out the low-strength area in the road and bridge model, intuitively displays the weaker position in the road and bridge by highlighting the low-strength area, reduces loopholes and errors in the design and construction process in the road and bridge actual construction or maintenance link, and improves the structural safety and stability of the road and bridge.
To achieve the above object, according to an aspect of the present disclosure, there is provided a road bridge structural strength analysis method based on BIM, the method including the steps of:
s100, acquiring a building information model of a road bridge;
s200, carrying out finite element analysis on the building information model of the road bridge to obtain structural strength data of the road bridge;
s300, calculating the base change limit of the road bridge through the structural strength data of the road bridge;
s400, screening out a low-intensity area in the building information model of the road bridge according to the basic variable limit of the road bridge.
Further, in step S100, the method for obtaining the building information model of the road bridge specifically includes: in the Revit software, building information models of roads and bridges are built according to the design drawings of the roads and bridges; or, scanning the road and bridge through the unmanned aerial vehicle to obtain two-dimensional images of a plurality of road and bridge, and establishing a building information model of the road and bridge through a three-dimensional modeling technology by using the two-dimensional images of the road and bridge; or scanning the road and bridge by a laser scanner to obtain point cloud data of the road and bridge, and generating a building information model of the road and bridge according to the point cloud data of the road and bridge, wherein the road and bridge is any one of roadbed, road surface, bridge, culvert and tunnel.
Further, in step S200, the method for obtaining structural strength data of the road bridge by performing finite element analysis on the building information model of the road bridge specifically includes: loading the building information model of the road bridge into finite element analysis software, and sequentially completing a modeling stage, a calculation stage and a post-processing stage for the building information model of the road bridge in the finite element analysis software;
performing unit division for a road and bridge building information model in a modeling stage to obtain a plurality of units (or called structure dispersion and grid division), setting load information and boundary conditions in a calculation stage, and solving the stress and strain suffered by each unit; in the post-processing stage, outputting a stress value and a strain value to which each unit is subjected; the stress value and the strain value received by the units are used as the structural strength data of the road bridge.
Further, in step S300, the method for calculating the base change limit of the road bridge according to the structural strength data of the road bridge specifically includes:
s301, in the structural strength data of the road and bridge, recording the number of a plurality of units as N (the units are polygonal in geometric structure, such as quadrangle, hexagon and the like), and taking the N units as N structural units;
s302, representing the ith unit in the N structural units by sn (i), representing the stress value received by the ith unit in the N structural units by sts (i), wherein i is a sequence number, i=1, 2, … and N, creating a blank array sts, sequentially storing N values sts (1), sts (2), … and sts (N) into the array sts, recording sts (j) as the jth element in the array sts, j=1, 2, … and N, recording the element with the smallest element value in the array sts as sts (a), recording the a-th unit (sn (a)) in the N structural units as an inner unit, creating a blank sequence Seq, adding the sequence number a into the sequence Seq, and turning to S303;
s303, in the N structure units, forming a first unit domain by the inner units and all units connected with the inner units, using U1 (k 1) to represent the stress magnitude of the kth 1 unit in the first unit domain, wherein k1 is a sequence number, k1=1, 2, …, U1, U1 is the number of all units in the first unit domain, recording sv (k 1) =ABS (U1 (k 1) -sts (a)), ABS () represents taking absolute value to the number in () and traversing sequence number k1 in the formula sv (k 1) =ABS (U1 (k 1) -sts (a)) to obtain U1 values sv (1), sv (2), …, sv (U1), sv (2), …, sv (U1) to form a set U1{ } and recording m1 as the sequence number, m 1E [ 1] in the first unit domain, namely, the sequence number is set 304, and the sequence number is set outside the first unit domain;
wherein, the definition of the unit connected with the inner unit is: for any unit Un in the N structure units, when any side of the unit Un is overlapped with any side of the inner unit, the unit Un is called as a unit connected with the inner unit;
s304, if the number of elements in the current sequence Seq is not more than 2, taking the current external unit as an internal unit and turning to S303; if the number of elements in the current sequence Seq is greater than 2, then go to S305;
s305, representing the kth 2 element in the sequence Seq with Seq (k 2), k2 being the sequence number, k2=1, 2, …, N1 being the number of all elements in the current sequence Seq, and forming sn (Seq (1)), sn (Seq (2)), …, sn (Seq (N1-1)) in the N structural unit into an N1 structural unit;
if a unit sn (Seq (S)) connected to sn (Seq (N1)) exists in the N1 structural unit, the process proceeds to S306;
if no connection exists between sn (Seq (N1)) and any of the N1 structural units, taking the current sn (Seq (N1)) as an internal unit and proceeding to S303;
among these, the method for judging whether or not a unit sn (Seq (s)) connected to sn (Seq (N1)) exists in the N1 structural unit is as follows: setting an integer variable i1, wherein the initial value of the integer variable i1 is 1, the value range of the integer variable i1 is [1, N1-1], and starting traversing the variable i1 in the value range of the integer variable i1: when any one side of sn (Seq (N1)) overlaps with any one side of current sn (Seq (i 1)), the value of current variable i1 is recorded as s, sn (Seq (s)) is expressed as a unit connected with sn (Seq (N1)), s is a sequence number, s epsilon [1, N1-1];
s306, in the N structural unit, sn (Seq (S)), sn (Seq (s+1)), …, sn (Seq (N1)) are formed into a superimposed domain; when the number of all units in the superposition domain exceeds half of the number of all units in the N structural units, then the base variation limit in the superposition domain is calculated, and the process goes to S307; when the number of all units in the superimposed domain is less than half of the number of all units in the N structural units, then deleting the superimposed domain in the N structural units (i.e., removing sn (Seq (S)) in the N structural units, sn (Seq (s+1)), …, sn (Seq (N1)) the N1 units, taking the N structural units from which the superimposed domain was deleted as new N structural units and going to S302;
s307, the base variation limit in the superposition domain is used as the base variation limit of the road bridge.
The beneficial effects of this step are: when the road bridge bears loads such as vehicles and pedestrians, internal stress and deformation can be generated, the stress and the deformation can cause deformation such as bending, torsion, elongation or shrinkage of components of the road bridge, so that the geometric shape and structural stability of the road bridge are affected, meanwhile, in the use environment of the road bridge, such as temperature change or structural strength change of the road bridge caused by internal force factors such as shearing force and axial force, the stress distribution of a model is obtained by utilizing a finite element analysis step, the stress distribution of the model is obtained by calculating the stress magnitude of each unit, a superposition domain in the road bridge structural model is screened out, the superposition domain is the region with the lowest stability in the road bridge structural model, the basic change limit in the superposition domain is used as the basic change limit of the road bridge, the basic change limit reflects the strength of different regions in the whole road bridge relative to the whole road bridge model, the region with lower structural strength in the road bridge model can be found out by utilizing the basic change limit, the position of the low structural strength is reinforced, the road bridge structure cannot exceed the structural strength range of the road bridge when the road bridge is subjected to extreme load, the safety is greatly improved, the safety of the road bridge is further improved, the material is selected, the service life is fully prolonged, and the material is sufficiently used.
Further, the calculation method of the base variation limit in the superposition domain comprises the following steps: the base change limit in the superimposed domain is noted as basel= [ ave { overspixel }/max { overspixel } ] sum (Pixel); where ave { overspixel } represents an average value of stress values received by all cells in the overlay domain, max { overspixel } represents a stress value of a cell in the overlay domain that receives a maximum stress value, sum (Pixel) represents a sum of stress values received by all cells in the N2 structural unit, and the N2 structural unit is composed of all cells in the N1 structural unit after the current overlay domain is deleted (i.e., all cells in the overlay domain are deleted from the N structural unit, and all remaining cells in the N structural unit are composed of the N2 structural unit).
Further, in step S400, the method for screening the low-intensity area in the building information model of the road bridge according to the basic variation limit of the road bridge specifically includes: randomly selecting one unit from the N structural units and marking the unit as sn (x), forming a second unit domain by the sn (x) and all units connected with the sn (x), and marking the second unit domain as a low-intensity area in the building information model when the base variable value in the second unit domain is larger than the base variable limit base L of the road bridge (namely, the second unit domain is an area with lower structural intensity); wherein the base variable value in the second cell domain is equal to the sum of the stress values experienced by all cells in the second cell domain; the definition of the cell that interfaces with sn (x) is: for any one unit Um in the N structure unit, when any one side of the unit Um is overlapped with any one side of sn (x), the unit Um is called as a unit connected with the inner unit.
Further, in step S400, the low-intensity area in the building information model of the road bridge is screened out according to the basic variation limit of the road bridge, and the method further includes: and (3) highlighting all low-intensity areas in the building information model of the road bridge, and outputting the building information model of the road bridge after highlighting to a display.
Because the low-structural-strength position of the road and bridge is generally in a regional block shape, the overall structural strength of the region is under the combined action of the stress magnitude suffered by each unit in the region, the basic change of the road and bridge is often not accurate enough only from the whole stress, the structural strength analysis result is affected, the structural strength analysis accuracy is improved at the same time, and the basic change limit calculation method in the superposition region can also be as follows:
s3011, using fie (j 1) to represent the stress value received by the jth 1 unit in the overlapped domain, where j1 is a sequence number, j1=1, 2, …, M is the number of all units in the overlapped domain, fie _a is an average value of the stress values received by all units in the overlapped domain, bell (j 1) = fie (j 1) -fie _a, traversing the sequence number j1 in the formula bell (j 1) = fie (j 1) -fie _a to obtain M values bell (1), bell (2), …, bell (M), sorting bell (1), bell (2), …, bell (M) in ascending order to obtain asc (1), asc (2), …, asc (M), and forming asc (1), asc (2), …, asc (M) into a set asc { and turning to S3012;
s3012, creating a blank array ord, initializing variables k3, wherein the initial value of k3 is 1, k3 epsilon [1, M ], traversing k3 from the initial value of k3, and turning to S3013;
s3013, using asc (n 1) to represent elements in the set asc { and the current bell (k 3) value equal to each other, adding the current n1 into the array ord, and turning to S3014;
s3014, if the value of the variable k3 is smaller than M, increasing the value of the variable k3 by 1, and turning to S3013; if the value of variable k3 is equal to M, go to S3015;
s3015, recording the base variable limit BaseL in the superposition domain as:
in ln []Representation pair []The number in the method is obtained by natural logarithmic operation, fie (j 1) represents the stress value size received by the j1 st unit in the superposition domain, ord (j 1) represents the j1 st element in the array ord, sum (Pixel) represents the sum of the stress values received by all units in an N2 structural unit, and the N2 structural unit consists of all units in the N1 structural unit after deleting the current superposition domain; k (K) 0 Represents the sum of all elements with negative values in the set asc { }, K 0 I represents the pair K 0 Taking the absolute value.
The beneficial effects of this step are: in the process of calculating the change limit of the road bridge foundation, the change limit of the foundation in the superposition domain is commonly influenced by the stress of each unit in the superposition domain, the stress of each unit can be balanced by the method of the step, and the coefficient in the change limit formula is modified by calculating the influence weights of different units in different positions on the change limit of the foundation in the superposition domain, so that the screening accuracy of a low-structural-strength region is effectively improved, and the region with lower deflection resistance and load bearing capacity in the road bridge model is accurately reflected.
The disclosure also provides a road bridge structural strength analysis system based on BIM, the road bridge structural strength analysis system based on BIM includes: the method comprises the steps of a BIM-based road and bridge structural strength analysis method, wherein the BIM-based road and bridge structural strength analysis system can be operated in a desktop computer, a notebook computer, a mobile phone, a portable phone, a tablet computer, a palm computer, a cloud data center and other computing devices, and the operable system can comprise, but is not limited to, a processor, a memory and a server cluster, and the processor executes the computer program to operate in the following units:
the model acquisition unit is used for acquiring a building information model of the road bridge;
the model analysis unit is used for carrying out finite element analysis on the building information model of the road bridge to obtain the structural strength data of the road bridge;
the data calculation unit is used for calculating the basic change limit of the road bridge through the structural strength data of the road bridge;
and the model screening unit is used for screening out a low-intensity area in the building information model of the road bridge according to the basic change limit of the road bridge.
The beneficial effects of the invention are as follows: the method can comprehensively analyze the structural strength of the road and bridge without manual calculation and judgment, coordinates the stress distribution of each part of the model in the structural strength analysis process, screens out the low-strength area in the road and bridge model, intuitively displays the weaker position in the road and bridge by highlighting the low-strength area, reduces loopholes and errors in the design and construction process in the road and bridge actual construction or maintenance link, and improves the structural safety and stability of the road and bridge.
Drawings
The above and other features of the present disclosure will become more apparent from the detailed description of the embodiments illustrated in the accompanying drawings, in which like reference numerals designate like or similar elements, and which, as will be apparent to those of ordinary skill in the art, are merely some examples of the present disclosure, from which other drawings may be made without inventive effort, wherein:
FIG. 1 is a flow chart of a method for analyzing road and bridge structural strength based on BIM;
fig. 2 is a system configuration diagram of a road bridge structural strength analysis system based on BIM.
Detailed Description
The conception, specific structure, and technical effects produced by the present disclosure will be clearly and completely described below in connection with the embodiments and the drawings to fully understand the objects, aspects, and effects of the present disclosure. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Fig. 1 is a flowchart of a method for analyzing road and bridge structural strength based on BIM according to the present invention, and a method for analyzing road and bridge structural strength based on BIM according to an embodiment of the present invention will be described with reference to fig. 1.
The disclosure provides a road bridge structural strength analysis method based on BIM, which comprises the following steps:
s100, acquiring a building information model of a road bridge;
s200, carrying out finite element analysis on the building information model of the road bridge to obtain structural strength data of the road bridge;
s300, calculating the base change limit of the road bridge through the structural strength data of the road bridge;
s400, screening out a low-intensity area in the building information model of the road bridge according to the basic variable limit of the road bridge.
Further, in step S100, the method for obtaining the building information model of the road bridge specifically includes: in the Revit software, building information models of roads and bridges are built according to the design drawings of the roads and bridges; or, scanning the road and bridge through the unmanned aerial vehicle to obtain two-dimensional images of a plurality of road and bridge, and establishing a building information model of the road and bridge through a three-dimensional modeling technology by using the two-dimensional images of the road and bridge; or scanning the road and bridge by a laser scanner to obtain point cloud data of the road and bridge, and generating a building information model of the road and bridge according to the point cloud data of the road and bridge, wherein the road and bridge is any one of roadbed, road surface, bridge, culvert and tunnel.
Further, in step S200, the method for obtaining structural strength data of the road bridge by performing finite element analysis on the building information model of the road bridge specifically includes: loading the building information model of the road bridge into finite element analysis software, and sequentially completing a modeling stage, a calculation stage and a post-processing stage for the building information model of the road bridge in the finite element analysis software;
performing unit division for a road and bridge building information model in a modeling stage to obtain a plurality of units (or called structure dispersion and grid division), setting load information and boundary conditions in a calculation stage, and solving the stress and strain suffered by each unit; in the post-processing stage, outputting a stress value and a strain value to which each unit is subjected; the stress value and the strain value received by the units are used as the structural strength data of the road bridge.
Further, in step S300, the method for calculating the base change limit of the road bridge according to the structural strength data of the road bridge specifically includes:
s301, in the structural strength data of the road and bridge, recording the number of a plurality of units as N (the units are polygonal in geometric structure, such as quadrangle, hexagon and the like), and taking the N units as N structural units;
s302, representing the ith unit in the N structural units by sn (i), representing the stress value received by the ith unit in the N structural units by sts (i), wherein i is a sequence number, i=1, 2, … and N, creating a blank array sts, sequentially storing N values sts (1), sts (2), … and sts (N) into the array sts, recording sts (j) as the jth element in the array sts, j=1, 2, … and N, recording the element with the smallest element value in the array sts as sts (a), recording the a-th unit (sn (a)) in the N structural units as an inner unit, creating a blank sequence Seq, adding the sequence number a into the sequence Seq, and turning to S303;
s303, in the N structure units, forming a first unit domain by the inner units and all units connected with the inner units, using U1 (k 1) to represent the stress magnitude of the kth 1 unit in the first unit domain, wherein k1 is a sequence number, k1=1, 2, …, U1, U1 is the number of all units in the first unit domain, recording sv (k 1) =ABS (U1 (k 1) -sts (a)), ABS () represents taking absolute value to the number in () and traversing sequence number k1 in the formula sv (k 1) =ABS (U1 (k 1) -sts (a)) to obtain U1 values sv (1), sv (2), …, sv (U1), sv (2), …, sv (U1) to form a set U1{ } and recording m1 as the sequence number, m 1E [ 1] in the first unit domain, namely, the sequence number is set 304, and the sequence number is set outside the first unit domain;
wherein, the definition of the unit connected with the inner unit is: for any unit Un in the N structure units, when any side of the unit Un is overlapped with any side of the inner unit, the unit Un is called as a unit connected with the inner unit;
s304, if the number of elements in the current sequence Seq is not more than 2, taking the current external unit as an internal unit and turning to S303; if the number of elements in the current sequence Seq is greater than 2, then go to S305;
s305, representing the kth 2 element in the sequence Seq with Seq (k 2), k2 being the sequence number, k2=1, 2, …, N1 being the number of all elements in the current sequence Seq, and forming sn (Seq (1)), sn (Seq (2)), …, sn (Seq (N1-1)) in the N structural unit into an N1 structural unit;
if a unit sn (Seq (S)) connected to sn (Seq (N1)) exists in the N1 structural unit, the process proceeds to S306;
if no connection exists between sn (Seq (N1)) and any of the N1 structural units, taking the current sn (Seq (N1)) as an internal unit and proceeding to S303;
among these, the method for judging whether or not a unit sn (Seq (s)) connected to sn (Seq (N1)) exists in the N1 structural unit is as follows: setting an integer variable i1, wherein the initial value of the integer variable i1 is 1, the value range of the integer variable i1 is [1, N1-1], and starting traversing the variable i1 in the value range of the integer variable i1: when any one side of sn (Seq (N1)) overlaps with any one side of current sn (Seq (i 1)), the value of current variable i1 is recorded as s, sn (Seq (s)) is expressed as a unit connected with sn (Seq (N1)), s is a sequence number, s epsilon [1, N1-1];
s306, in the N structural unit, sn (Seq (S)), sn (Seq (s+1)), …, sn (Seq (N1)) are formed into a superimposed domain; when the number of all units in the superposition domain exceeds half of the number of all units in the N structural units, then the base variation limit in the superposition domain is calculated, and the process goes to S307; when the number of all units in the superimposed domain is less than half of the number of all units in the N structural units, then deleting the superimposed domain in the N structural units (i.e., removing sn (Seq (S)) in the N structural units, sn (Seq (s+1)), …, sn (Seq (N1)) the N1 units, taking the N structural units from which the superimposed domain was deleted as new N structural units and going to S302;
s307, the base variation limit in the superposition domain is used as the base variation limit of the road bridge.
Further, the calculation method of the base variation limit in the superposition domain comprises the following steps: the base change limit in the superimposed domain is noted as basel= [ ave { overspixel }/max { overspixel } ] sum (Pixel); where ave { overspixel } represents an average value of stress values received by all cells in the overlay domain, max { overspixel } represents a stress value of a cell in the overlay domain that receives a maximum stress value, sum (Pixel) represents a sum of stress values received by all cells in the N2 structural unit, and the N2 structural unit is composed of all cells in the N1 structural unit after the current overlay domain is deleted (i.e., all cells in the overlay domain are deleted from the N structural unit, and all remaining cells in the N structural unit are composed of the N2 structural unit).
Further, in step S400, the method for screening the low-intensity area in the building information model of the road bridge according to the basic variation limit of the road bridge specifically includes: randomly selecting one unit from the N structural units and marking the unit as sn (x), forming a second unit domain by the sn (x) and all units connected with the sn (x), and marking the second unit domain as a low-intensity area in the building information model when the base variable value in the second unit domain is larger than the base variable limit base L of the road bridge (namely, the second unit domain is an area with lower structural intensity); wherein the base variable value in the second cell domain is equal to the sum of the stress values experienced by all cells in the second cell domain; the definition of the cell that interfaces with sn (x) is: for any one unit Um in the N structure unit, when any one side of the unit Um is overlapped with any one side of sn (x), the unit Um is called as a unit connected with the inner unit.
Further, in step S400, the low-intensity area in the building information model of the road bridge is screened out according to the basic variation limit of the road bridge, and the method further includes: and (3) highlighting all low-intensity areas in the building information model of the road bridge, and outputting the building information model of the road bridge after highlighting to a display.
Because the low-structural-strength position of the road and bridge is generally in a regional block shape, the overall structural strength of the region is under the combined action of the stress magnitude suffered by each unit in the region, the basic change of the road and bridge is often not accurate enough only from the whole stress, the structural strength analysis result is affected, the structural strength analysis accuracy is improved at the same time, and the basic change limit calculation method in the superposition region can also be as follows:
s3011, using fie (j 1) to represent the stress value received by the jth 1 unit in the overlapped domain, where j1 is a sequence number, j1=1, 2, …, M is the number of all units in the overlapped domain, fie _a is an average value of the stress values received by all units in the overlapped domain, bell (j 1) = fie (j 1) -fie _a, traversing the sequence number j1 in the formula bell (j 1) = fie (j 1) -fie _a to obtain M values bell (1), bell (2), …, bell (M), sorting bell (1), bell (2), …, bell (M) in ascending order to obtain asc (1), asc (2), …, asc (M), and forming asc (1), asc (2), …, asc (M) into a set asc { and turning to S3012;
s3012, creating a blank array ord, initializing variables k3, wherein the initial value of k3 is 1, k3 epsilon [1, M ], traversing k3 from the initial value of k3, and turning to S3013;
s3013, using asc (n 1) to represent elements in the set asc { and the current bell (k 3) value equal to each other, adding the current n1 into the array ord, and turning to S3014;
s3014, if the value of the variable k3 is smaller than M, increasing the value of the variable k3 by 1, and turning to S3013; if the value of variable k3 is equal to M, go to S3015;
s3015, recording the base variable limit BaseL in the superposition domain as:
in ln []Representation pair []The number in the stack is obtained by natural logarithm operation, fie (j 1) represents the stress value size of the j1 th unit in the superposition domain, ord (j 1) represents the th unit in the array ordj1 elements, sum (Pixel) represents the sum of stress values received by all units in an N2 structural unit, wherein the N2 structural unit consists of all units in the N1 structural unit after deleting the current superposition domain; k (K) 0 Represents the sum of all elements with negative values in the set asc { }, K 0 I represents the pair K 0 Taking the absolute value.
The road bridge structural strength analysis system based on BIM comprises: the steps in the above-mentioned embodiments of the method for analyzing road and bridge structural strength based on BIM are implemented when the processor executes the computer program, and the system for analyzing road and bridge structural strength based on BIM may be operated in a computing device such as a desktop computer, a notebook computer, a mobile phone, a tablet computer, a palm computer, a cloud data center, etc., and the operable system may include, but is not limited to, a processor, a memory, and a server cluster.
As shown in fig. 2, a road bridge structural strength analysis system based on BIM provided by an embodiment of the present disclosure includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, the steps in one embodiment of a BIM-based road bridge structural strength analysis method being implemented when the processor executes the computer program, the processor executing the computer program to run in units of the following system:
the model acquisition unit is used for acquiring a building information model of the road bridge;
the model analysis unit is used for carrying out finite element analysis on the building information model of the road bridge to obtain the structural strength data of the road bridge;
the data calculation unit is used for calculating the basic change limit of the road bridge through the structural strength data of the road bridge;
and the model screening unit is used for screening out a low-intensity area in the building information model of the road bridge according to the basic change limit of the road bridge.
The road bridge structural strength analysis system based on BIM can be operated in computing equipment such as desktop computers, notebook computers, palm computers and cloud data centers. The road bridge structural strength analysis system based on BIM comprises, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the examples are merely examples of a method and a system for analyzing bridge structural strength based on BIM, and are not limited to a method and a system for analyzing bridge structural strength based on BIM, and may include more or fewer components than examples, or may combine some components, or different components, for example, the system for analyzing bridge structural strength based on BIM may further include an input/output device, a network access device, a bus, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete component gate or transistor logic devices, discrete hardware components, or the like. The general processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor is a control center of the BIM-based road bridge structural strength analysis system, and various interfaces and lines are used to connect the various sub-areas of the whole BIM-based road bridge structural strength analysis system.
The memory may be used to store the computer program and/or module, and the processor may implement the various functions of the BIM-based road and bridge structural strength analysis method and system by running or executing the computer program and/or module stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The invention provides a road bridge structural strength analysis method based on BIM, which comprises the steps of obtaining a building information model of a road bridge, carrying out finite element analysis on the building information model of the road bridge to obtain structural strength data of the road bridge, calculating a basic variation limit of the road bridge through the structural strength data of the road bridge, and screening out a low-strength area in the building information model of the road bridge according to the basic variation limit of the road bridge. The method can comprehensively analyze the structural strength of the road and bridge without manual calculation and judgment, coordinates the stress distribution of each part of the model in the structural strength analysis process, screens out the low-strength area in the road and bridge model, intuitively displays the weaker position in the road and bridge by highlighting the low-strength area, reduces loopholes and errors in the design and construction process in the road and bridge actual construction or maintenance link, and improves the structural safety and stability of the road and bridge. Although the description of the present disclosure has been illustrated in considerable detail and with particularity, it is not intended to be limited to any such detail or embodiment or any particular embodiment so as to effectively cover the intended scope of the present disclosure. Furthermore, the foregoing description of the present disclosure has been presented in terms of embodiments foreseen by the inventor for the purpose of providing a enabling description for enabling the enabling description to be available, notwithstanding that insubstantial changes in the disclosure, not presently foreseen, may nonetheless represent equivalents thereto.
Claims (6)
1. The road bridge structural strength analysis method based on BIM is characterized by comprising the following steps of:
s100, acquiring a building information model of a road bridge;
s200, carrying out finite element analysis on the building information model of the road bridge to obtain structural strength data of the road bridge;
s300, calculating the base change limit of the road bridge through the structural strength data of the road bridge;
s400, screening out a low-intensity area in a building information model of the road bridge according to the basic variable limit of the road bridge;
in step S300, the method for calculating the base change limit of the road bridge according to the structural strength data of the road bridge specifically includes:
s301, in the structural strength data of the road and the bridge, recording the number of a plurality of units as N, and taking the N units as N structural units;
s302, representing the ith unit in the N structural units by sn (i), representing the stress value received by the ith unit in the N structural units by sts (i), wherein i is a sequence number, i=1, 2, … and N, creating a blank array sts, sequentially storing N values sts (1), sts (2), … and sts (N) into the array sts, recording sts (j) as the jth element in the array sts, j=1, 2, … and N, recording the element with the smallest element value in the array sts as sts (a), recording the a th unit in the N structural units as an inner unit, creating a blank sequence Seq, adding the sequence number a into the sequence Seq, and turning to S303;
s303, in the N structure units, forming a first unit domain by the inner units and all units connected with the inner units, using U1 (k 1) to represent the stress magnitude of the kth 1 unit in the first unit domain, wherein k1 is a sequence number, k1=1, 2, …, U1, U1 is the number of all units in the first unit domain, recording sv (k 1) =ABS (U1 (k 1) -sts (a)), ABS () represents taking absolute value to the number in () and traversing sequence number k1 in the formula sv (k 1) =ABS (U1 (k 1) -sts (a)) to obtain U1 values sv (1), sv (2), …, sv (U1), sv (2), …, sv (U1) to form a set U1{ } and recording m1 as the sequence number, m 1E [ 1] in the first unit domain, namely, the sequence number is set 304, and the sequence number is set outside the first unit domain;
wherein, the definition of the unit connected with the inner unit is: for any unit Un in the N structure units, when any side of the unit Un is overlapped with any side of the inner unit, the unit Un is called as a unit connected with the inner unit;
s304, if the number of elements in the current sequence Seq is not more than 2, taking the current external unit as an internal unit and turning to S303; if the number of elements in the current sequence Seq is greater than 2, then go to S305;
s305, representing the kth 2 element in the sequence Seq with Seq (k 2), k2 being the sequence number, k2=1, 2, …, N1 being the number of all elements in the current sequence Seq, and forming sn (Seq (1)), sn (Seq (2)), …, sn (Seq (N1-1)) in the N structural unit into an N1 structural unit;
if a unit sn (Seq (S)) connected to sn (Seq (N1)) exists in the N1 structural unit, the process proceeds to S306;
if no connection exists between sn (Seq (N1)) and any of the N1 structural units, taking the current sn (Seq (N1)) as an internal unit and proceeding to S303;
among these, the method for judging whether or not a unit sn (Seq (s)) connected to sn (Seq (N1)) exists in the N1 structural unit is as follows: setting an integer variable i1, wherein the initial value of the integer variable i1 is 1, the value range of the integer variable i1 is [1, N1-1], and starting traversing the variable i1 in the value range of the integer variable i1: when any one side of sn (Seq (N1)) overlaps with any one side of current sn (Seq (i 1)), the value of current variable i1 is recorded as s, sn (Seq (s)) is expressed as a unit connected with sn (Seq (N1)), s is a sequence number, s epsilon [1, N1-1];
s306, in the N structural unit, sn (Seq (S)), sn (Seq (s+1)), …, sn (Seq (N1)) are formed into a superimposed domain; when the number of all units in the superposition domain exceeds half of the number of all units in the N structural units, then the base variation limit in the superposition domain is calculated, and the process goes to S307; when the number of all units in the superposition domain is less than half of the number of all units in the N structural units, deleting the superposition domain in the N structural units, taking the N structural units with the deleted superposition domain as new N structural units, and transferring to S302;
s307, taking the base variation limit in the superposition domain as the base variation limit of the road bridge;
in step S400, the method for screening the low-intensity area in the building information model of the road bridge according to the basic change limit of the road bridge specifically includes: randomly selecting one unit from the N structural units and marking the unit as sn (x), forming a second unit domain by the sn (x) and all units connected with the sn (x), and marking the second unit domain as a low-intensity area in the building information model when the base variable value in the second unit domain is larger than the base variable limit base L of the road bridge; wherein the base variable value in the second cell domain is equal to the sum of the stress values experienced by all cells in the second cell domain; the definition of the cell that interfaces with sn (x) is: for any one unit Um in the N structure unit, when any one side of the unit Um is overlapped with any one side of sn (x), the unit Um is called as a unit connected with the inner unit.
2. The method for analyzing the structural strength of a road and bridge based on BIM according to claim 1, wherein in step S100, the method for obtaining the building information model of the road and bridge specifically includes: in the Revit software, building information models of roads and bridges are built according to the design drawings of the roads and bridges; or, scanning the road and bridge through the unmanned aerial vehicle to obtain two-dimensional images of a plurality of road and bridge, and establishing a building information model of the road and bridge through a three-dimensional modeling technology by using the two-dimensional images of the road and bridge; or scanning the road and bridge by a laser scanner to obtain point cloud data of the road and bridge, and generating a building information model of the road and bridge according to the point cloud data of the road and bridge, wherein the road and bridge is any one of roadbed, road surface, bridge, culvert and tunnel.
3. The method for analyzing the structural strength of a road and a bridge based on BIM according to claim 1, wherein in step S200, the method for analyzing the building information model of the road and the bridge to obtain the structural strength data of the road and the bridge specifically comprises the following steps: loading the building information model of the road bridge into finite element analysis software, and sequentially completing a modeling stage, a calculation stage and a post-processing stage for the building information model of the road bridge in the finite element analysis software;
performing unit division for the road and bridge building information model in a modeling stage to obtain a plurality of units, setting load information and boundary conditions in a calculation stage, and solving the stress and strain suffered by each unit; in the post-processing stage, outputting a stress value and a strain value to which each unit is subjected; the stress value and the strain value received by the units are used as the structural strength data of the road bridge.
4. The road bridge structural strength analysis method based on BIM according to claim 1, wherein the basic transformation limit in the superposition domain is calculated by the following method: the base change limit in the superimposed domain is noted as basel= [ ave { overspixel }/max { overspixel } ] sum (Pixel); wherein ave { overspixel } represents an average value of stress values received by all cells in the superimposed domain, max { overspixel } represents a stress value of a cell having a largest stress value received in the superimposed domain, sum (Pixel) represents a sum of stress values received by all cells in an N2 structural unit, and the N2 structural unit is composed of all cells in the N1 structural unit from which the current superimposed domain is deleted.
5. The method for analyzing the structural strength of a bridge based on BIM according to claim 1, wherein in step S400, a low-strength area in a building information model of the bridge is selected according to a base variation limit of the bridge, and further comprising: and (3) highlighting all low-intensity areas in the building information model of the road bridge, and outputting the building information model of the road bridge after highlighting to a display.
6. The road bridge structural strength analysis system based on BIM is characterized by comprising: a processor, a memory and a computer program stored in the memory and running on the processor, wherein the processor implements the steps in a BIM-based road and bridge structural strength analysis method according to any one of claims 1 to 5 when the computer program is executed, and the BIM-based road and bridge structural strength analysis system is running in a computing device of a desktop computer, a notebook computer, a palm computer or a cloud data center.
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