Analysis of the Forces in the Whole Construction Process of the Inclined Column Steel Structure of the Prestressed Beam Foundation

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Analysis of the Forces in the Whole Construction Process of the Inclined Column Steel Structure of the Prestressed Beam Foundation

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[1]LIANG Yan,ZHAO Zhenghao,DU Xiaoxi,et al.Analysis of the Forces in the Whole Construction Process of the Inclined Column Steel Structure of the Prestressed Beam Foundation[J].Journal of Zhengzhou University (Engineering Science),2022,43(05):78-83.[doi:10.13705/j.issn.1671-6833.2022.05.011]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43 Number of periods: 2022 05 Page number: 78-83 Column: Public date: 2022-08-22

Title:: Analysis of the Forces in the Whole Construction Process of the Inclined Column Steel Structure of the Prestressed Beam Foundation

Author(s):: LIANG Yan, ZHAO Zhenghao, DU Xiaoxi, LU Aoqi; School of Civil Engineering， Zhengzhou University, Zhengzhou 450001, China

Keywords:: steel structure; prestressed foundation beam; finite element analysis; structural stress; displacement of pile head

CLC:: N39；TU753. 3

DOI:: 10.13705/j.issn.1671-6833.2022.05.011

Abstract:: In order to study the force change of the inclined column steel structure of the prestressed tie beam foundation during the construction process, a finite element analysis model was established by Midas Gen based on the entire construction process of a large site protection building. The calculated results of the model displacement were close to the measured data, which verified the correctness of the model. Through the real-time tracking calculation of the changes of internal force and foundation horizontal displacement in each stage of the structure, the analysis of the influence of the number of foundation beams, section size and prestress on the stress of the superstructure and the horizontal displacement of pile top, this study provided a reasonable scheme for foundation displacement control. The results showed that the number of foundation beams and section size had little effect on the stress of the upper structure; the horizontal displacement of the pile top decreased with the increase of the number of foundation beams, and the maximum reduction was about 60% of the design control value，but the reduction range of displacement decreased with the further increase of the number of tie beams; The change of the tie beam section diameter had little effect on pile top displacement. Increasing the thickness of beam could effectively reduce the pile top displacement. The pre-stress has a greater influence on the control structure stress and foundation displacement, the maximum reduction of critical section stress of inclined column was 20%; the foundation deformation would develop to the center of multi pile cap after prestressed tensioning, and the maximum change of foundation displacement was 140%, the prestress scheme could significantly reduce the risk of pile shear failure, and there would be more conducive to displacement control and structural safety.

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Last Update: 2022-08-23