CN111442822B - Method and device for detecting load of bridge passing vehicle - Google Patents
Method and device for detecting load of bridge passing vehicle Download PDFInfo
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- CN111442822B CN111442822B CN202010382956.8A CN202010382956A CN111442822B CN 111442822 B CN111442822 B CN 111442822B CN 202010382956 A CN202010382956 A CN 202010382956A CN 111442822 B CN111442822 B CN 111442822B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/03—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/52—Weighing apparatus combined with other objects, e.g. furniture
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Abstract
The invention provides a method and a device for detecting the load of a bridge passing through a vehicle, wherein a plurality of nodes are uniformly arranged on each beam according to the bridge span of a detected bridge, and a dynamic deflection sensor is arranged at each node at the bottom of each beam, wherein the number of the nodes arranged on each beam is the same as the positions of the nodes; processing the data collected by the dynamic deflection sensor to obtain the running speed of the vehicle of the detected bridge 1 on the detected bridge and the mid-span deflection of each beam, and processing to obtain the deflection time area of each beam; and (4) processing the time and the area of deflection of each beam based on the running speed of the vehicle to obtain the load of the vehicle. Aiming at the small and medium span reinforced concrete bridge, the load of the passing vehicle can be accurately measured based on the passing speed of the vehicle and the dynamic deflection of the bridge.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method and a device for detecting the load of a bridge passing through a vehicle.
Background
In the prior art, a sensor is generally used for detecting the strain generated when a vehicle passes through a small-and-medium-span reinforced concrete bridge, so that the load of the vehicle passing through the bridge is obtained. However, this detection method is generally applicable to steel bridges of uniform material quality.
For a reinforced concrete bridge, a main beam of the reinforced concrete bridge is usually made of reinforced concrete, and the lower edge of the reinforced concrete bridge is generally damaged by local cracks and the like, so that the local strain of the lower edge of the reinforced concrete beam is related to the load on the bridge and the distance from a detection point to a peripheral crack.
Disclosure of Invention
Based on the technical problems, the invention provides a method and a device for detecting the load of a passing vehicle of a bridge, and solves the technical problem that the load of the passing vehicle on a small and medium-span reinforced concrete bridge is difficult to accurately detect in the prior art.
A method for detecting the load of a bridge passing through a vehicle comprises the following steps:
step A1, uniformly arranging a plurality of nodes on each beam according to the bridge span of the detected bridge, and arranging a dynamic deflection sensor at each node at the beam bottom of each beam, wherein the number of the nodes arranged on each beam is the same as the positions of the nodes;
step A2, processing the data collected by the dynamic deflection sensor to obtain the running speed of the vehicle of the detected bridge 1 on the detected bridge and the mid-span deflection of each beam, and processing to obtain the deflection time area of each beam;
and step A3, obtaining the load of the vehicle based on the running speed of the vehicle and the deflection time area processing of each beam.
Further, in step a2, the process of acquiring the driving speed of the vehicle specifically includes the following steps:
step A21, acquiring the running time difference of the vehicle between two nodes through the detection data of the dynamic deflection sensors at two nodes on one beam;
step A22, processing to obtain the running speed of the vehicle based on the distance between two nodes and the running time difference;
and step A23, obtaining the deflection time area based on the running speed of the vehicle and mid-span deflection processing of each beam.
Further, in step a2, the midspan deflection of each beam involved in the vehicle is obtained through processing the detection data of the dynamic deflection sensor of the node 1/2 of the bridge span.
Further, in step a23, the deflection time area of each beam involved in the vehicle is obtained by the following formula:
wherein A is the deflection time area of each beam;
v is the running speed of the vehicle;
l is the bridge span of the detected bridge;
Further, for a vehicle passing through the detected bridge, the relationship between the load of the vehicle and the dynamic deflection of a single beam is shown as the following formula:
wherein E is the elastic modulus of the detected bridge;
i is the bending stiffness of each beam;
l is the bridge span of the detected bridge;
a is the moving distance of the vehicle;
p is the load of the vehicle;
further, in step a3, the load of the vehicle passing through the detected bridge on the single beam is calculated by the following formula:
wherein P is the load of the vehicle;
l is the bridge span of the detected bridge;
e is the elastic modulus of the detected bridge;
i is the bending stiffness of a single beam;
a is the deflection time area of a single beam;
v is the running speed of the vehicle.
Further, in step a3, when the vehicle passing through the detected bridge is a multi-axle vehicle, the load of the multi-axle vehicle on the plurality of beams is obtained by the following calculation formula:
wherein P is the load of the multi-axle vehicle;
Ajthe deflection time area of the jth beam is shown;
βjthe bending rigidity ratio of the jth beam to the middle beam is obtained;
i' is the bending stiffness of the center sill;
v is the running speed of the multi-axle vehicle;
l is the bridge span of the detected bridge;
e, detecting the elastic modulus of the bridge;
m is the number of beams.
Further, step a1 specifically includes: three nodes are uniformly arranged on each beam according to the bridge span of the detected bridge, and are respectively arranged at 1/4, 1/2 and 3/4 of the bridge span.
Further, step a21 specifically includes: acquiring the running time difference of the passing vehicle between two nodes at 1/4 and 3/4 of the bridge span through the detection data of the dynamic deflection sensors at 1/4 and 3/4 of the bridge span on one beam;
the step a22 specifically includes: and processing the distance and the time difference between the two nodes based on the 1/4 position and 3/4 position of the bridge span to obtain the running speed of the vehicle.
A vehicle load detection device is arranged on a detected bridge, is applied to the detection method for the load of a passing vehicle of the bridge, and is used for carrying out load detection on the passing vehicle of the bridge to be detected;
uniformly arranging a plurality of nodes on each beam of the bridge to be detected along the span of the bridge;
the vehicle load detection device specifically includes:
the dynamic deflection sensors are arranged on a node respectively, and each dynamic deflection sensor 2 is arranged on a node;
the data collection unit is respectively connected with each dynamic deflection sensor, receives the detection data of the dynamic deflection sensors in real time for collection,
the first processing unit is connected with the data collecting unit and used for processing detection data based on the dynamic deflection sensor to obtain the running speed of the vehicle passing through the bridge to be detected;
the second processing unit is connected with the data collecting unit and used for processing detection data based on the dynamic deflection sensor to obtain the midspan deflection of each beam related to the vehicle passing through the bridge to be detected;
the third processing unit is respectively connected with the first processing unit and the second processing unit and used for obtaining the deflection time area of each beam based on mid-span deflection processing of each beam according to the running speed of the vehicle;
and the fourth processing unit is respectively connected with the first processing unit and the third processing unit and is used for obtaining the load of the vehicle based on the running speed of the vehicle and the deflection time area processing of each beam.
The beneficial technical effects of the invention are as follows: the dynamic deflection sensors are arranged on different nodes of the detected bridge, so that the load passing through the vehicle can be accurately calculated based on the detection data of the dynamic deflection sensors, and the method is particularly suitable for small and medium-span reinforced concrete bridges.
Drawings
FIG. 1 is a diagram of a sensor arrangement in accordance with an embodiment of the method of the present invention;
FIG. 2 is a deflection curve test chart of test points of a single-beam single-pass vehicle in an embodiment of the method of the invention;
fig. 3 is a schematic view of a multi-axle vehicle load in an embodiment of the method of the present invention.
Fig. 4-5 are flow charts of the method steps of the present invention.
Fig. 6 is a schematic structural view of a bridge passing vehicle load detection device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The dynamic deflection of the reinforced concrete beam span is determined by the weight of the passing vehicle and the rigidity of the reinforced concrete beam, so that the influence of local unevenness of materials is extremely small, and the weight of the passing vehicle on the small and medium-span reinforced concrete bridge 1 can be accurately detected by detecting the dynamic deflection.
The invention provides a method for detecting the load of a bridge passing through a vehicle, which is characterized in that the mid-span deflection of a reinforced concrete bridge is related to the weight of the vehicle passing through the bridge and the rigidity of the bridge, and the influence of local nonuniformity of materials on the mid-span deflection of the bridge is very small.
Referring to fig. 1-5, the invention provides a method for detecting the load of a bridge passing through a vehicle, which is characterized by comprising the following steps:
step A1, uniformly arranging a plurality of nodes on each beam according to the bridge span of the detected bridge 1, and arranging a dynamic deflection sensor 2 at each node at the beam bottom of each beam, wherein the number of the nodes arranged on each beam is the same as the positions of the nodes;
step A2, processing the data collected by the dynamic deflection sensor 2 to obtain the running speed of the vehicle of the detected bridge 1 on the detected bridge 1 and the mid-span deflection of each beam, and processing to obtain the deflection time area of each beam;
and step A3, obtaining the load of the vehicle based on the running speed of the vehicle and the deflection time area processing of each beam.
Further, in step a2, the process of acquiring the driving speed of the vehicle specifically includes the following steps:
step A21, acquiring the running time difference of the vehicle between two nodes through the detection data of the dynamic deflection sensors 2 at two nodes on one beam;
step A22, processing to obtain the running speed of the vehicle based on the distance between two nodes and the running time difference;
and step A23, obtaining the deflection time area based on the running speed of the vehicle and mid-span deflection processing of each beam.
Further, in step a2, the midspan deflection of each beam involved in the vehicle is obtained through processing the detection data of the dynamic deflection sensor 2 of the node 1/2 of the bridge span.
Further, in step a23, the deflection time area of each beam involved in the vehicle is obtained by the following formula:
wherein A is the deflection time area of each beam;
v is the running speed of the vehicle;
l is the bridge span of the detected bridge 1;
In particular, V can be regarded as the average speed of the vehicle, assuming that the vehicle passes through the detected bridge 1 at a constant speed.
Further, for a vehicle passing through the detected bridge 1, the relationship between the load of the vehicle and the dynamic deflection of a single beam is shown as the following formula:
wherein E is the elastic modulus of the detected bridge 1;
i is the bending stiffness of each beam;
l is the bridge span of the detected bridge 1;
a is the moving distance of the vehicle;
p is the load of the vehicle;
further, in step a3, the load of the vehicle passing through the detected bridge 1 on the single beam is calculated by the following formula:
wherein P is the load of the vehicle;
l is the bridge span of the detected bridge 1;
e is the elastic modulus of the detected bridge 1;
i is the bending stiffness of a single beam;
a is the deflection time area of a single beam;
v is the running speed of the vehicle.
Further, in step a3, when the vehicle passing through the detected bridge 1 is a multi-axle vehicle, the load of the multi-axle vehicle on the plurality of beams is obtained by the following calculation formula:
wherein P is the load of the multi-axle vehicle;
Ajthe deflection time area of the jth beam is shown;
βjthe bending rigidity ratio of the jth beam to the middle beam is obtained;
i' is the bending stiffness of the center sill;
v is the running speed of the multi-axle vehicle;
l is the bridge span of the detected bridge 1;
e, detecting the elastic modulus of the bridge 1;
m is the number of beams.
The load of the multi-axle vehicle passing through the detected bridge 1 with a plurality of beams can be calculated by utilizing the superposition principle and the bridge transverse distribution principle.
Specifically, the detected bridge 1 is a plate girder structure.
Specifically, the multi-axle vehicle is 3 axles, and as shown in fig. 3, due to the weight of the vehicle head, the load of the wheels on each axle is different, and the load of the left and right wheels on the same axle is equally divided, for example, the load of the left and right wheels on the first axle is P1/2, the load of the left and right wheels on the first axle is P2/2, and the load of the left and right wheels on the first axle is P3/2. Further, step a1 specifically includes: three nodes are uniformly arranged on each beam according to the bridge span of the detected bridge 1, and the three nodes are respectively arranged at 1/4, 1/2 and 3/4 of the bridge span.
Further, step a21 specifically includes: acquiring the running time difference of the passing vehicle between two nodes at 1/4 and 3/4 of the bridge span through the detection data of the dynamic deflection sensors 2 at 1/4 and 3/4 of the bridge span on one beam;
the step a22 specifically includes: and processing the distance and the time difference between the two nodes based on the 1/4 position and 3/4 position of the bridge span to obtain the running speed of the vehicle.
Referring to fig. 6, the invention further provides a vehicle load detection device, which is installed on the detected bridge 1, and is applied to the detection method for detecting the load of the passing vehicle of the bridge, and is used for detecting the load of the passing vehicle of the bridge to be detected;
uniformly arranging a plurality of nodes on each beam of the bridge to be detected along the span of the bridge;
the vehicle load detection device specifically includes:
the dynamic deflection sensors 2 are arranged on a node respectively;
the data collection unit 3 is respectively connected with each dynamic deflection sensor 2, receives the detection data of the dynamic deflection sensors 2 in real time for collection,
the first processing unit 4 is connected with the data collecting unit 3 and used for processing the detection data of the dynamic deflection sensor 2 to obtain the running speed of the vehicle passing through the bridge to be detected;
the second processing unit 5 is connected with the data collecting unit 4 and used for processing detection data based on the dynamic deflection sensor 2 to obtain mid-span deflection of each beam related to the vehicle passing through the bridge to be detected;
the third processing unit 6 is respectively connected with the first processing unit 4 and the second processing unit 5 and is used for obtaining the deflection time area of each beam based on mid-span deflection processing of each beam according to the running speed of the vehicle;
and the fourth processing unit 7 is respectively connected with the first processing unit 4 and the third processing unit 6 and is used for obtaining the load of the vehicle based on the running speed of the vehicle and the deflection time area processing of each beam.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A method for detecting the load of a bridge passing through a vehicle is characterized by comprising the following steps:
step A1, uniformly arranging a plurality of nodes on each beam according to the bridge span of the detected bridge, and arranging a dynamic deflection sensor at each node at the beam bottom of each beam, wherein the number of the nodes arranged on each beam is the same as the positions of the nodes;
step A2, processing the data collected by the dynamic deflection sensor to obtain the running speed of the vehicle of the detected bridge on the detected bridge and the mid-span deflection of each beam, and processing to obtain the deflection time area of each beam;
step A3, processing the deflection time area of each beam based on the running speed of the vehicle to obtain the load of the vehicle;
in the step a2, the process of acquiring the driving speed of the vehicle specifically includes the following steps:
step A21, acquiring the running time difference of the vehicle between two nodes on a beam through the detection data of the dynamic deflection sensors at the two nodes;
step A22, processing to obtain the running speed of the vehicle based on the distance between the two nodes and the running time difference;
step A23, obtaining the deflection time area based on the running speed of the vehicle and mid-span deflection processing of each beam;
in step a23, the deflection time area of each beam involved in the vehicle is obtained by the following formula:
wherein A is the deflection time area of each beam;
v is the running speed of the vehicle;
l is the bridge span of the detected bridge;
for a vehicle passing through the detected bridge, the relationship between the load of the vehicle and the dynamic deflection of a single beam is shown as the following formula:
wherein E is the elastic modulus of the detected bridge;
i is the bending stiffness of each beam;
l is the bridge span of the detected bridge;
a is the distance the vehicle moves;
p is the load of the vehicle.
2. The method for detecting the load of the bridge passing through the vehicle as claimed in claim 1, wherein in the step A2, the midspan deflection of each beam involved in the vehicle is obtained through the detection data processing of the dynamic deflection sensor of the node at 1/2 of the bridge span.
3. The method for detecting the load of the bridge passing through the vehicle as claimed in claim 1, wherein in the step A3, the load of the vehicle passing through the detected bridge on a single beam is calculated by the following formula:
wherein P is the load of the vehicle;
l is the bridge span of the detected bridge;
e is the elastic modulus of the detected bridge;
i is the bending stiffness of a single beam;
a is the deflection time area of a single beam;
v is the running speed of the vehicle.
4. The method for detecting the load of a bridge passing through vehicles as claimed in claim 1, wherein in step A3, when the vehicle passing through the detected bridge is a multi-axle vehicle, the load of the multi-axle vehicle on a plurality of beams is obtained by the following calculation formula:
wherein P is the load of the multi-axle vehicle;
Ajthe deflection time area of the jth beam is shown;
βjthe bending rigidity ratio of the jth beam to the middle beam is obtained;
i' is the bending stiffness of the center sill;
v is the running speed of the multi-axle vehicle;
l is the bridge span of the detected bridge;
e, the elastic modulus of the detected bridge;
m is the number of beams.
5. The method for detecting the load of the bridge passing through the vehicle according to claim 1, wherein the step A1 is specifically as follows: and uniformly arranging three nodes on each beam according to the bridge span of the detected bridge, wherein the three nodes are respectively positioned at 1/4, 1/2 and 3/4 of the bridge span.
6. The method for detecting the load of the bridge passing through the vehicle according to claim 1, wherein the step A21 is specifically as follows: acquiring the running time difference of a passing vehicle between two nodes at 1/4 and 3/4 of a bridge span through detection data of dynamic deflection sensors at 1/4 and 3/4 of the bridge span on one beam;
the step a22 specifically includes: and processing the distance between two nodes based on 1/4 and 3/4 of the bridge span and the time difference to obtain the driving speed of the vehicle.
7. A vehicle load detection device, characterized in that the vehicle load detection device is installed on a detected bridge and applied to a bridge passing vehicle load detection method according to any one of claims 1-6, and is used for carrying out load detection on vehicles passing through the detected bridge;
uniformly arranging a plurality of nodes on each beam of the detected bridge along the span of the bridge;
the vehicle load detection device specifically includes:
the dynamic deflection sensors are respectively arranged on one node;
the data collection unit is respectively connected with each dynamic deflection sensor, receives the detection data of the dynamic deflection sensors in real time and collects the detection data,
the first processing unit is connected with the data collecting unit and used for processing the detection data of the dynamic deflection sensor to obtain the running speed of the vehicle passing through the detected bridge;
the second processing unit is connected with the data collection unit and used for processing detection data of the dynamic deflection sensor to obtain mid-span deflection of each beam related to the vehicle passing through the detected bridge;
the third processing unit is respectively connected with the first processing unit and the second processing unit and used for obtaining the deflection time area of each beam based on the running speed of the vehicle and mid-span deflection processing of each beam;
and the fourth processing unit is respectively connected with the first processing unit and the third processing unit and is used for processing the running speed of the vehicle and the deflection time and area of each beam to obtain the load of the vehicle.
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| CN115752676B (en) * | 2022-06-15 | 2023-09-22 | 东南大学 | Bridge dynamic weighing method based on mid-span deflection |
| CN117746346B (en) * | 2023-06-14 | 2024-06-28 | 宁波朗达科技有限公司 | Heavy vehicle load identification method |
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