CN111428309A - Pile foundation uplift resistance-based high-rise structure anti-overturning performance design method with large height-width ratio - Google Patents
Pile foundation uplift resistance-based high-rise structure anti-overturning performance design method with large height-width ratio Download PDFInfo
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Abstract
A design method for the anti-overturning performance of a high-rise structure with a large height-width ratio based on the uplift resistance of a pile foundation. The method comprises the steps of checking and accepting the small earthquake weight ratio of the structure; analyzing the equivalent elasticity of the earthquake in the structure and calculating the uplift resistance of the pile foundation; calculating the uplift reinforcement of the pile foundation according to the uplift force of the pile foundation; and when the uplift resistance of the pile foundation is larger, additionally arranging technical measures of the shear wall and the pile foundation, recalculating uplift reinforcing bars of the pile foundation and the like. The design method for the anti-overturning performance of the high-rise structure with the large height-width ratio based on the uplift of the pile foundation can consider the middle earthquake effect, considers the contribution of the pile foundation to the anti-overturning capacity of the high-rise structure, and simultaneously improves the anti-overturning capacity of the high-rise structure under the action of strong earthquake by additionally arranging the underground anti-overturning wall body and the pile foundation.
Description
Technical Field
The invention relates to a design method for the anti-overturning performance of a high-rise structure with a large height-width ratio based on pile foundation uplift resistance, and belongs to the technical field of building engineering.
Background
For a high-rise or high-rise structure, the structure has a large height-width ratio due to large height and relatively small plane size, and the anti-overturning of the high-rise structure under the action of an earthquake is the safety guarantee of structural earthquake resistance. At present, the anti-overturning performance of a high-rise structure with a large height-to-width ratio mainly considers the limit value of the stiffness-to-weight ratio of the upper part of the structure under the action of small earthquake, so that the anti-overturning performance of the high-rise structure under the action of medium and large earthquake cannot be ensured; meanwhile, the current calculation method does not consider the influence of the bearing capacity of the structural pile foundation, and no structural foundation technical measures for improving the overturning resistance of the high-rise structure exist.
Disclosure of Invention
In order to solve the above problems, the present invention provides a design method for anti-overturning performance of a high-rise structure with a high aspect ratio based on pile foundation uplift, thereby providing a method and a measure for anti-overturning design of a high-rise or high-rise structure with a high aspect ratio.
In order to achieve the aim, the design method for the anti-overturning performance of the high-rise structure with the high aspect ratio based on pile foundation uplift provided by the invention comprises the following steps in sequence:
1) establishing a high-rise structure three-dimensional analysis model consisting of an upper structure, a basement and a pile foundation, then analyzing the small earthquake action of the high-rise structure to ensure that the structure stiffness-weight ratio meets the requirement of a limit value, preliminarily determining the diameter, the pile length and the number of the pile foundations on the high-rise structure according to the structure dead load action, and determining the specific arrangement form of the pile foundations;
2) establishing a high-rise structure three-dimensional model considering the pile foundation effect by using the concrete arrangement form of the pile foundation determined in the step 1), and then carrying out medium-seismic equivalent elastic analysis on the high-rise structure by using the model to obtain the constant load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEUplift resistance N of pile foundation under action of buoyancy of waterFThe three internal forces are used for calculating the total uplift force N of the pile foundation according to the three internal forcestotal；
3) Utilizing the total uplift force N of the pile foundation calculated in the step 2)totalAnd tensile strength f of the reinforcing baryDetermining the uplift reinforcement area A of the pile foundation considering the high-rise structure anti-overturning design under the action of the medium earthquakesAnd as the area of the pile foundation reinforcement, wherein the reinforcement is arranged along the length of the pile;
4) when the total uplift force N of the pile foundation determined in the step 2) is determinedtotalLarger to ensure that the pile foundation reinforcement area A determined in the step 3) is largersArea A of reinforcing bars for pile foundation compression resistancescWhen the total weight of the basement is 2-4 times, a shear wall is additionally arranged on the outer side surface of the basement along the direction of larger structural overturning force, and a shear wall pile foundation is additionally arranged below the shear wall as a technical measure;
5) performing middle-earthquake equivalent elasticity analysis on the high-rise structure of the basement after the shear wall and the shear wall pile foundation are additionally arranged, and obtaining the respective constant load axial force N of the pile foundation on the high-rise structure and the shear wall pile foundation under the structureG'Pulling resistance N under the action of earthquakeE'Uplift resistance N generated by water buoyancy on pile foundationF'And then respectively calculating the three internal forces to obtain the total uplift force N of the pile foundation and the shear wall pile foundation by adopting the three internal forces of the pile foundation and the shear wall pile foundationtotal'And according to the total pullout resistance Ntotal'And tensile strength f of the reinforcing baryCalculating to obtain the uplift reinforcement area A of the pile foundation and the shear wall pile foundations'。
In step 1), the method for establishing the high-rise structure three-dimensional analysis model formed by the upper structure, the basement and the pile foundation, then analyzing the small earthquake action of the high-rise structure to enable the structure stiffness-weight ratio to meet the limit value requirement, and preliminarily determining the diameter, the pile length and the number of the pile foundation on the high-rise structure according to the structure dead load action, thereby determining the concrete arrangement form of the pile foundation is as follows: determining the arrangement of an upper structure, a basement and a pile foundation of a high-rise structure according to the building functional layout and structural arrangement requirements, establishing a three-dimensional analysis model of the high-rise structure, and then carrying out small earthquake analysis on the high-rise structure by using the model to ensure that the stiffness-to-weight ratio of the high-rise structure meets the limit value requirement of the specification, so that the high-rise structure meets the anti-overturning requirement of small earthquake; and then determining the diameter and the length of the pile foundation to determine the bearing capacity of the single pile, and preliminarily determining the number of the pile foundations according to the structure dead load effect.
In the step 2), establishing a high-rise structure three-dimensional model considering the pile foundation effect by using the concrete arrangement form of the pile foundation determined in the step 1), and then performing medium-seismic equivalent elastic analysis on the high-rise structure by using the model to obtain the constant-load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEUplift resistance N of pile foundation under action of buoyancy of waterFThe three internal forces are used for calculating the total uplift force N of the pile foundation according to the three internal forcestotalThe method comprises the following steps: according to the concrete arrangement form of the pile foundation determined in the step 1), considering the buoyancy effect of underground water, carrying out medium-seismic equivalent elastic analysis on the high-rise structure, and calculating to obtain the constant load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEPile foundation uplift resistance N under the action of water buoyancyFThe total uplift resistance N of the pile foundation is calculated according to the three internal forces by using the following formulatota lThe calculation formula is as follows:
Ntotal＝NG-NE-NF。
in the step 3), the total uplift force N of the pile foundation calculated in the step 2) is utilizedtotalAnd tensile strength f of the reinforcing baryDetermining the uplift reinforcement area A of the pile foundation considering the high-rise structure anti-overturning design under the action of the medium earthquakesThe method for taking the area of the pile foundation reinforcement comprises the following steps: utilizing the total uplift force N of the pile foundation calculated in the step 2)totalAnd tensile strength f of the reinforcing baryCalculating the uplift reinforcement area A of the pile foundation of the high-rise structure anti-overturning design under the consideration of the medium-seismic effect through the following formulas：
As＝Ntotal/fy。
In the step 4), the pile foundation uplift resistance N determined in the step 3) istotalLarger reinforcement area AsArea A of reinforcing bars for pile foundation compression resistance sc2 times to 4 times of the total amount of the organic acid, at this timeThe method for additionally arranging the shear wall in the basement of the structure along the direction of larger structure overturning force and additionally arranging the pile foundation under the additionally arranged shear wall as a technical measure comprises the following steps: when the pile foundation uplift force N determined in the step 3) is determinedtotalLarger reinforcement area AsArea A of reinforcing bars for pile foundation compression resistancescAnd when the height of the pile foundation is 2 times to 4 times, the shear wall is added and arranged along the basement through height, and the pile foundation is arranged under the added shear wall.
In step 5), the total pullout resistance Ntotal'The calculation formula of (2) is as follows:
Ntotal'＝NG'-NE'-NF'
wherein N isG'The constant load axial force of the pile foundation or the shear wall pile foundation; n is a radical ofE'The uplift resistance of the pile foundation or the shear wall pile foundation under the earthquake action is realized; n is a radical ofF'The uplift resistance is generated by the water buoyancy on the pile foundation or the shear wall pile foundation;
the area A of the anti-pulling reinforcement bars'The calculation formula of (2) is as follows:
As'＝Ntotal'/fy。
the design method for the anti-overturning performance of the high-rise structure with the large height-width ratio based on the uplift of the pile foundation can consider the middle earthquake effect, considers the contribution of the pile foundation to the anti-overturning capacity of the high-rise structure, and simultaneously improves the anti-overturning capacity of the high-rise structure under the action of strong earthquake by additionally arranging the underground anti-overturning wall body and the pile foundation.
Drawings
FIG. 1 is a schematic representation of a three-dimensional structure of a high-rise structure using the method of the present invention.
Figure 2 is a top view of a high-level structure employing the method of the present invention.
Detailed Description
The method for designing the anti-overturning performance of the high-rise structure with the high aspect ratio based on pile foundation uplift provided by the invention is described in detail below with reference to the accompanying drawings and embodiments.
The design method for the anti-overturning performance of the high-rise structure with the large height-width ratio based on the pile foundation uplift comprises the following steps in sequence:
1) establishing a high-rise structure three-dimensional analysis model composed of an upper structure 1, a basement 2 and a pile foundation 3 as shown in figure 1, then analyzing the small earthquake action of the high-rise structure to enable the structure stiffness-weight ratio to meet the limit value requirement, and preliminarily determining the diameter, the pile length and the number of the pile foundations 3 on the high-rise structure according to the structure dead load action, thereby determining the specific arrangement form of the pile foundations 3;
the specific method comprises the following steps: determining the arrangement of an upper structure 1, a basement 2 and a pile foundation 3 of a high-rise structure according to the building functional layout and structural arrangement requirements, establishing a three-dimensional analysis model of the high-rise structure, and then carrying out minor earthquake analysis on the high-rise structure by using the model to ensure that the stiffness-to-weight ratio of the high-rise structure meets the limit value requirement of the specification, so that the high-rise structure meets the anti-overturning requirement of the minor earthquake; and then determining the diameter and the pile length of the pile foundation 3 to determine the bearing capacity of the single pile, and preliminarily determining the number of the pile foundations 3 according to the structure dead load effect.
2) Establishing a high-rise structure three-dimensional model considering the action of the pile foundation 3 by using the specific arrangement form of the pile foundation 3 determined in the step 1), and then carrying out medium-seismic equivalent elastic analysis on the high-rise structure by using the model to obtain the constant load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEUplift resistance N of pile foundation under action of buoyancy of waterFThe three internal forces are used for calculating the total uplift force N of the pile foundation according to the three internal forcestotal；
The specific method comprises the following steps: according to the concrete arrangement form of the pile foundation 3 determined in the step 1), considering the buoyancy effect of underground water, carrying out medium-seismic equivalent elasticity analysis on the high-rise structure, and thus calculating to obtain the constant load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEPile foundation uplift resistance N under the action of water buoyancyFThe total uplift resistance N of the pile foundation is calculated according to the three internal forces by using the following formulatotal：
Ntotal＝NG-NE-NF。
3) Utilizing the total uplift force N of the pile foundation calculated in the step 2)totalAnd tensile strength f of the reinforcing baryDetermining the uplift reinforcement area A of the pile foundation considering the high-rise structure anti-overturning design under the action of the medium earthquakesAnd as the area of the pile foundation reinforcement, wherein the reinforcement is arranged along the length of the pile;
the specific method comprises the following steps: utilizing the total uplift force N of the pile foundation calculated in the step 2)totalAnd tensile strength f of the reinforcing baryCalculating the uplift reinforcement area A of the pile foundation of the high-rise structure anti-overturning design under the consideration of the medium-seismic effect through the following formulas：
As＝Ntotal/fy
4) When the total uplift force N of the pile foundation determined in the step 2) is determinedtotalLarger to ensure that the pile foundation reinforcement area A determined in the step 3) is largersArea A of reinforcing bars for pile foundation compression resistancescWhen the total weight of the basement is 2 to 4 times, a shear wall 4 is additionally arranged on the outer side surface of the basement 2 along the direction of larger structural overturning force, and a shear wall pile foundation 5 is additionally arranged below the shear wall 4 as a technical measure;
the shear walls 4 are arranged along the through height of the basement 2, and the number of the shear walls 4 is required to meet the uplift reinforcement area A of the pile foundation 3 and the shear wall pile foundation 5 calculated in the step 5)s'Less than 3 compression-resistant reinforcement area A of pile foundation sc2 times of the total weight of the powder.
5) Performing middle-earthquake equivalent elasticity analysis on the high-rise structure of the basement 2 after additionally arranging the shear wall 4 and the shear wall pile foundation 5 to obtain the respective constant load axial force N of the pile foundation 3 and the shear wall pile foundation 5 on the high-rise structure under the structureG'Pulling resistance N under the action of earthquakeE'Uplift resistance N generated by pile foundation under action of buoyancy of waterF'And then respectively calculating the three internal forces of the pile foundation 3 and the shear wall pile foundation 5 to obtain the total uplift force N of the pile foundation 3 and the shear wall pile foundation 5total'And according to the total pullout resistance Ntotal'And tensile strength f of the reinforcing baryCalculating to obtain the uplift reinforcement area A of the pile foundation 3 and the shear wall pile foundation 5s'。
The total pulling resistance Ntotal'The calculation formula of (2) is as follows:
Ntotal'＝NG'-NE'-NF'
wherein N isG'The constant load axial force of the pile foundation 3 or the shear wall pile foundation 5; n is a radical ofE'The uplift resistance of the pile foundation 3 or the shear wall pile foundation 5 under the earthquake action is achieved; n is a radical ofF'The uplift resistance is generated on the pile foundation 3 or the shear wall pile foundation 5 by the water buoyancy;
the area A of the anti-pulling reinforcement bars'The calculation formula of (2) is as follows: as ═ Ntotal'/fy。
Claims (6)
1. A design method for the anti-overturning performance of a high-rise structure with a large height-width ratio based on pile foundation uplift is characterized by comprising the following steps: the method comprises the following steps which are carried out in sequence:
1) establishing a high-rise structure three-dimensional analysis model consisting of an upper structure (1), a basement (2) and a pile foundation (3), then analyzing the small earthquake action of the high-rise structure to ensure that the structure stiffness-weight ratio meets the limit value requirement, preliminarily determining the diameter, the pile length and the number of the pile foundations (3) on the high-rise structure according to the structure dead load action, and determining the specific arrangement form of the pile foundations (3);
2) establishing a high-rise structure three-dimensional model considering the action of the pile foundation (3) by utilizing the concrete arrangement form of the pile foundation (3) determined in the step 1), and then carrying out medium-seismic equivalent elastic analysis on the high-rise structure by utilizing the model to obtain the constant-load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEUplift resistance N of pile foundation under action of buoyancy of waterFThe three internal forces are used for calculating the total uplift force N of the pile foundation according to the three internal forcestotal；
3) Utilizing the total uplift force N of the pile foundation calculated in the step 2)totalAnd tensile strength f of the reinforcing baryDetermining the uplift reinforcement area A of the pile foundation considering the high-rise structure anti-overturning design under the action of the medium earthquakesAnd as the area of the pile foundation reinforcement, wherein the reinforcement is arranged along the length of the pile;
4) when determined in step 2)Pile foundation total uplift resistance NtotalLarger to ensure that the pile foundation reinforcement area A determined in the step 3) is largersArea A of reinforcing bars for pile foundation compression resistancescWhen the total weight of the basement is 2-4 times, a shear wall (4) is additionally arranged on the outer side surface of the basement (2) along the direction of larger structural overturning force, and a shear wall pile foundation (5) is additionally arranged below the shear wall (4) as a technical measure;
5) performing middle-earthquake equivalent elastic analysis on the high-rise structure of the basement (2) after the shear wall (4) and the shear wall pile foundation (5) are additionally arranged, and obtaining the respective constant-load axial force N of the pile foundation (3) and the shear wall pile foundation (5) on the high-rise structure under the structureG'Pulling resistance N under the action of earthquakeE'Uplift resistance N generated by water buoyancy on pile foundationF'And then respectively calculating the three internal forces of the pile foundation (3) and the shear wall pile foundation (5) to obtain the total uplift resistance N of the pile foundation (3) and the shear wall pile foundation (5)total'And according to the total pullout resistance Ntotal'And tensile strength f of the reinforcing baryCalculating to obtain the uplift reinforcement area A of the pile foundation (3) and the shear wall pile foundation (5)s'。
2. The pile foundation uplift-based high-aspect-ratio high-rise structure overturn-resistance performance design method according to claim 1, characterized in that: in the step 1), the method for determining the concrete arrangement form of the pile foundation (3) comprises the following steps of establishing a high-rise structure three-dimensional analysis model consisting of an upper structure (1), a basement (2) and the pile foundation (3), then analyzing the small earthquake action of the high-rise structure to enable the structure stiffness-weight ratio to meet the limit value requirement, and preliminarily determining the diameter, the pile length and the number of the pile foundation (3) on the high-rise structure according to the structure dead load action: determining the arrangement of an upper structure (1), a basement (2) and a pile foundation (3) of a high-rise structure according to building functional layout and structural arrangement requirements, establishing a three-dimensional analysis model of the high-rise structure, and then carrying out small earthquake analysis on the high-rise structure by using the model to ensure that the stiffness-to-weight ratio of the high-rise structure meets the limit value requirement of the specification and the high-rise structure meets the anti-overturning requirement of the small earthquake; and then determining the diameter and the pile length of the pile foundation (3) to determine the bearing capacity of the single pile, and preliminarily determining the number of the pile foundations (3) according to the structure dead load effect.
3. The pile foundation uplift-based high-aspect-ratio high-rise structure overturn-resistance performance design method according to claim 1, characterized in that: in the step 2), establishing a high-rise structure three-dimensional model considering the action of the pile foundation (3) by utilizing the concrete arrangement form of the pile foundation (3) determined in the step 1), and then carrying out medium-seismic equivalent elastic analysis on the high-rise structure by utilizing the model to obtain the constant-load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEUplift resistance N of pile foundation under action of buoyancy of waterFThe three internal forces are used for calculating the total uplift force N of the pile foundation according to the three internal forcestotalThe method comprises the following steps: according to the concrete arrangement form of the pile foundation (3) determined in the step 1), considering the buoyancy effect of underground water, carrying out medium-seismic equivalent elasticity analysis on the high-rise structure, and calculating to obtain the constant load axial force N of the pile foundationGPile foundation uplift resistance N under earthquake actionEPile foundation uplift resistance N under the action of water buoyancyFThe total uplift resistance N of the pile foundation is calculated according to the three internal forces by using the following formulatotalThe calculation formula is as follows:
Ntotal＝NG-NE-NF。
4. the pile foundation uplift-based high-aspect-ratio high-rise structure overturn-resistance performance design method according to claim 1, characterized in that: in the step 3), the total uplift force N of the pile foundation calculated in the step 2) is utilizedtotalAnd tensile strength f of the reinforcing baryDetermining the uplift reinforcement area A of the pile foundation considering the high-rise structure anti-overturning design under the action of the medium earthquakesThe method for taking the area of the pile foundation reinforcement comprises the following steps: utilizing the total uplift force N of the pile foundation calculated in the step 2)totalAnd tensile strength f of the reinforcing baryCalculating the uplift reinforcement area A of the pile foundation of the high-rise structure anti-overturning design under the consideration of the medium-seismic effect through the following formulas：
As＝Ntotal/fy。
5. The pile foundation uplift-based high-aspect-ratio high-rise structure overturn-resistance performance design method according to claim 1, characterized in that: in the step 4), the pile foundation uplift resistance N determined in the step 3) istotalLarger reinforcement area AsArea A of reinforcing bars for pile foundation compression resistancesc2 times to 4 times, at this moment, add shear force wall (4) in the basement of structure along the great direction of structure overturning force to add pile foundation (5) under adding shear force wall as the method of technical measure and be: when the pile foundation uplift force N determined in the step 3) is determinedtotalLarger reinforcement area AsArea A of reinforcing bars for pile foundation compression resistancescWhen the height of the basement is 2 to 4 times, the shear wall (4) is added and is arranged along the through height of the basement (2), and the pile foundation (5) is arranged under the added shear wall (4).
6. The pile foundation uplift-based high-aspect-ratio high-rise structure overturn-resistance performance design method according to claim 1, characterized in that: in step 5), the total pullout resistance Ntotal'The calculation formula of (2) is as follows:
Ntotal'＝NG'-NE'-NF'
wherein N isG'The constant load axial force of the pile foundation (3) or the shear wall pile foundation (5); n is a radical ofE'The uplift resistance of the pile foundation (3) or the shear wall pile foundation (5) under the earthquake action is realized; n is a radical ofF'The uplift resistance is generated on the pile foundation (3) or the shear wall pile foundation (5) by the water buoyancy;
the area A of the anti-pulling reinforcement bars'The calculation formula of (2) is as follows:
As'＝Ntotal'/fy。
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| CN113190907A (en) * | 2021-05-17 | 2021-07-30 | 云南省设计院集团有限公司 | Building structure equivalent height-width ratio calculation method based on lateral displacement deformation |
| CN114519228A (en) * | 2022-02-24 | 2022-05-20 | 四川省建筑设计研究院有限公司 | Method for rapidly calculating anti-overturning stress of large-height-to-width-ratio double-tower-structure skirt house floor slab |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112084635A (en) * | 2020-08-21 | 2020-12-15 | 山东电力工程咨询院有限公司 | Overturning stability verification method and system for power transmission pole foundation |
| CN112084635B (en) * | 2020-08-21 | 2023-09-01 | 山东电力工程咨询院有限公司 | Method and system for overturning stability verification of transmission pole foundation |
| CN113190907A (en) * | 2021-05-17 | 2021-07-30 | 云南省设计院集团有限公司 | Building structure equivalent height-width ratio calculation method based on lateral displacement deformation |
| CN113190907B (en) * | 2021-05-17 | 2023-10-20 | 云南省设计院集团有限公司 | Building structure equivalent height-width ratio calculation method based on lateral movement deformation |
| CN114519228A (en) * | 2022-02-24 | 2022-05-20 | 四川省建筑设计研究院有限公司 | Method for rapidly calculating anti-overturning stress of large-height-to-width-ratio double-tower-structure skirt house floor slab |
| CN114519228B (en) * | 2022-02-24 | 2023-09-22 | 四川省建筑设计研究院有限公司 | Anti-overturning stress rapid calculation method for skirt house floor slab with large height-width ratio double-tower structure |
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