基于Abaqus的托换结构受力性能分析

Mechanical performance analysis of underpinning structure based on Abaqus

为探讨建筑物顶升纠倾托换结构连梁对上部结构受力和变形的影响,采用Abaqus软件对托换节点进行静力加载分析,对比托换节点模拟与试验的破坏模式和载荷-应变关系,验证有限元模型的有效性。设计3组托换结构,研究不同连梁高度对托换结构破坏形态、连梁受力状态和载荷-变形曲线的影响。结果表明:连梁高度的增加可提高结构的极限承载力;连梁在加载过程中产生较大负弯矩,连梁上部纵筋出现较大变形,因此合理选择连梁纵筋配置有利于提高托换结构的承载力。

To explore the influence of coupling beam of building jacking rectification underpinning structure on the stress and deformation of upper structure,the static loading of underpinning joints is analyzed using Abaqus software.The effectiveness of the finite element model is verified by the comparison of failure mode and load-strain relation of underpinning joint between the simulation and test.Three groups of underpinning structures are designed to study the effect of different coupling beam height on the failure mode,stress state and load-deformation curve of underpinning structure.The results show that the ultimate bearing capacity of the structure can be improved by increasing the coupling beam height.The coupling beam produces large negative bending moment during the loading,and the longitudinal reinforcement of the coupling beam has large deformation.The reasonable selection of the longitudinal reinforcement configuration of the coupling beam is conducive to improve the bearing capacity of the underpinning structure.