抱箍式托换节点隔震加固的施工过程仿真分析

Simulation analysis of construction process of seismic-isolation retrofit with hoop-type underpinning joints

采用抱箍式托换节点进行隔震加固时,各施工步骤对应的结构约束条件会随时发生变化.同时,由于该节点施工需要分批分段进行,施工过程中不同施工步骤、不同顶升机械的控制机制均会对结构造成影响.对一个既有框架结构,采用抱箍式托换节点隔震加固的施工过程进行有限元模拟,分析不同施工步骤、顶升机械不同步时引起的结构内力及变形变化规律,并由此给出抱箍式托换节点隔震加固的相关施工建议及施工过程控制条件.研究结果对隔震加固的实际施工起到指导作用,并且提出有数值依据的参考意见,可保证施工安全.

Due to seismic-isolation retrofit with hoop-type underpinning joints,the constraints of the structure changes during the construction process.Meanwhile,the construction is carried out in batches and sections,the differences of the construction steps and the jacking machine control mechanisms affect the structure.Thus,finite element method is adopted to simulate the construction process of the seismic-isolation retrofit the existed frame building with the hoop-type underpinning joints.The internal force and the deformation of the structure are discussed for different construction steps and caused by the nonsynchronous jacking machine control mechanisms.Some construction process suggestions and the jacking machine control mechanisms condition are given based on the rule of the internal force and deformation.This study will play a guiding role in the actual construction of seismic-isolation retrofit project,and put forward the reference opinions with numerical basis to ensure the construction safety.