CN-119442425-B - Design method of polygonal asymmetric pile foundation bearing platform

Abstract

The invention relates to the technical field of constructional engineering, in particular to a design method of a polygonal asymmetric pile foundation pile cap, which comprises the steps of collecting information data of a polygonal asymmetric pile foundation pile cap engineering site, establishing a three-dimensional finite element model of the polygonal asymmetric pile foundation pile cap according to the collected information data, carrying out numerical simulation by utilizing the three-dimensional finite element model to obtain a stress-strain distribution cloud picture of the polygonal asymmetric pile foundation pile cap, identifying key areas in the stress-strain distribution cloud picture under different working conditions, judging a main damage mode of the polygonal asymmetric pile foundation pile cap according to the stress and strain distribution characteristics of the identified key areas, selecting a corresponding design model according to the main damage mode, and recalculating the number of reinforcing bars and the arrangement mode of the polygonal asymmetric pile foundation pile cap according to the selected design model.

Inventors

• WANG FENG

Assignees

• 中国五冶集团有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (3)

1. 1. The design method of the polygonal asymmetric pile foundation bearing platform is characterized by comprising the following steps of: Step S1, collecting information data of the polygonal asymmetric pile foundation bearing platform engineering site, and establishing a three-dimensional finite element model of the polygonal asymmetric pile foundation bearing platform according to the collected information data, wherein the information data comprises geological and anti-seismic conditions, upper load conditions and existing pile position arrangement; S2, performing numerical simulation by using the three-dimensional finite element model to obtain a stress strain distribution cloud picture of the polygonal asymmetric pile foundation bearing platform, and identifying key areas in the stress strain distribution cloud picture under different working conditions, wherein the key areas comprise a maximum bending moment area and a shearing stress concentration area; Step S3, judging a main failure mode of the polygonal asymmetric pile foundation bearing platform according to the stress and strain distribution characteristics of the identified key area, and selecting a corresponding design model according to the main failure mode; s4, recalculating the number of reinforcing bars required by the polygonal asymmetric pile foundation bearing platform and the arrangement mode of the reinforcing bars according to the selected design model; And S5, performing simulation verification on the recalculated number and arrangement mode of the required reinforcing bars of the polygonal asymmetric pile foundation pile cap by using the three-dimensional finite element model.
2. 2. The method for designing a polygonal asymmetric pile cap according to claim 1, wherein in the step S1, a three-dimensional finite element model of the polygonal asymmetric pile cap is built based on the collected information data using engineering calculation software.
3. 3. The method according to claim 1, wherein in the step S3, if the main failure mode is determined to be bending failure, a beam system design model is selected, and if the main failure mode is determined to be punching failure, a tension-compression bar design model is selected.

Description

Design method of polygonal asymmetric pile foundation bearing platform Technical Field The invention relates to the technical field of constructional engineering, in particular to a design method of a polygonal asymmetric pile foundation bearing platform. Background In modern construction engineering, pile caps are widely used in various engineering fields. The bearing platform is used as a structural member for supporting the upper and lower parts, and the load transmitted by the upper structure is transmitted to the piles and then transmitted to the foundation by the piles, so that the bearing platform has enough bearing capacity. Generally, the planar size and shape of pile caps are determined by the number and arrangement of piles, and are generally rectangular and circular. However, in actual engineering, irregularly shaped platforms, such as polygonal asymmetric platforms, may occur due to topography, geology, or design changes. At present, the prior art has more researches on the regular pile foundation bearing platform, but less researches on the calculation model, the force transmission mechanism, the damage mode and the calculation method of the irregular pile foundation bearing platform, so how to solve the problems of difficult design and calculation of the irregular pile foundation bearing platform in the prior art has become a technical problem to be solved by the technicians in the field. Disclosure of Invention Aiming at the problems, the invention discloses a design method of a polygonal asymmetric pile foundation pile cap, which aims to solve the problems of difficult design and calculation of the polygonal asymmetric pile foundation pile cap in the prior art. A design method of a polygonal asymmetric pile foundation bearing platform comprises the following steps: Step S1, collecting information data of the polygonal asymmetric pile foundation pile cap engineering site, and establishing a three-dimensional finite element model of the polygonal asymmetric pile foundation pile cap according to the collected information data; s2, performing numerical simulation by using the three-dimensional finite element model to obtain a stress strain distribution cloud picture of the polygonal asymmetric pile foundation bearing platform, and identifying key areas in the stress strain distribution cloud picture under different working conditions; Step S3, judging a main failure mode of the polygonal asymmetric pile foundation bearing platform according to the stress and strain distribution characteristics of the identified key area, and selecting a corresponding design model according to the main failure mode; and S4, recalculating the number of reinforcing bars required by the polygonal asymmetric pile foundation bearing platform and the arrangement mode of the reinforcing bars according to the selected design model. In some of these embodiments, the information data includes geological and seismic conditions, upper loading conditions, and existing pile placement. In some of these embodiments, in the step S1, engineering calculation software is used to build a three-dimensional finite element model of the polygonal asymmetric pile cap according to the collected information data. In some of these embodiments, the plastic behaviour of the concrete and the elastic plastic deformation of the steel reinforcement are taken into account in the creation of the three-dimensional finite element model of the polygonal asymmetric pile cap. In some of these embodiments, in the step S2, the critical area includes a maximum bending moment area and a shear stress concentration area. In some embodiments, in the step S3, if the main failure mode is determined to be bending failure, a beam system design model is selected, and if the main failure mode is determined to be punching failure, a tension-compression bar design model is selected. In some of these embodiments, the design method further comprises: And S5, performing simulation verification on the recalculated number and arrangement mode of the required reinforcing bars of the polygonal asymmetric pile foundation pile cap by using the three-dimensional finite element model. Compared with the prior art, the invention has at least one of the following advantages or beneficial effects: the invention provides a design method of a polygonal asymmetric pile foundation pile cap, which overcomes the limitation of the traditional design method in processing the polygonal asymmetric pile foundation pile cap, improves the bearing capacity and the safety of the pile foundation pile cap, effectively controls the material cost and realizes the structural optimization. Drawings The invention and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout. The drawings may not be to scale, emphasis instead being placed upon illustrating th