[1]梁 岩,赵正豪,杜晓溪,等.预应力系梁基础斜柱钢结构施工全过程受力分析[J].郑州大学学报(工学版),2022,43(05):78-83.[doi:10.13705/j.issn.1671-6833.2022.05.011]
　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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预应力系梁基础斜柱钢结构施工全过程受力分析()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
43
期数:
2022年05期
页码:
78-83
栏目:
出版日期:
2022-08-22

文章信息/Info

Title:
Analysis of the Forces in the Whole Construction Process of the Inclined Column Steel Structure of the Prestressed Beam Foundation
作者:
梁 岩;  赵正豪;  杜晓溪;  卢奥奇
郑州大学土木工程学院;

Author(s):
LIANG Yan;  ZHAO Zhenghao;  DU Xiaoxi;  LU Aoqi
School of Civil Engineering， Zhengzhou University, Zhengzhou 450001, China
关键词:
Keywords:
steel structure;  prestressed foundation beam;  finite element analysis;  structural stress;  displacement of pile head
分类号:
N39；TU753. 3
DOI:
10.13705/j.issn.1671-6833.2022.05.011
文献标志码:
A
摘要:
为研究施工过程中预应力系梁基础斜柱钢结构受力变化,基于某大型遗址保护建筑,采用 Midas Gen 建立施工全过程精细化有限元模型。 模型位移计算结果与实测数据相近,证明了模型的正确性,进而通过对结构各阶段内力和基础水平位移变化进行实时跟踪计算,分析基础系梁数量、截面尺寸、 施加预应力对上部结构应力及桩顶水平位移的影响,为基础位移控制提供合理方案。 结果表明:基础系 梁数量、系梁截面尺寸对上部结构应力影响较小;桩顶位移随基础系梁数量增加而减小,最大减小量约 为设计限值( 2 mm)的 60%,但随着系梁数量进一步增加,位移减小幅度逐渐降低;基础系梁截面直径变化对桩顶位移影响较小,增加系梁截面厚度能有效减小桩顶位移,但位移控制效果随厚度增大而减小; 预应力对结构应力及基础位移影响较大,斜柱关键截面应力最大降低 20%,且基础位移向多承台中心发展,基础位移与预应力张拉前相比最大变化 140%,采用预应力方案可显著降低桩体剪切破坏风险,更有利于位移控制及保障结构安全。
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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更新日期/Last Update: 2022-08-23