底层自复位框架结构抗震性能分析  

Seismic Performance Analysis of Bottom-Storey Self-Centering Frame Structure

作　　者：许势然 李培振[1] 何胤龙 XU Shiran;LI Peizhen;HE Yinlong(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾减灾全国重点实验室,上海200092

出　　处：《结构工程师》2024年第3期68-75,共8页Structural Engineers

基　　金：国家自然科学基金项目(51978524)。

摘　　要：采用有限元软件ABAQUS,以8度(0.2g)设防的地区为例,建立多层多跨的普通框架结构和底层自复位框架结构三维有限元模型。选取4条地震动,分别以0.07g、0.4g的峰值加速度输入结构,进行弹塑性时程分析,对比两个结构在地震作用下的动力响应及破坏模式。数值模拟结果表明:自复位框架结构的层间位移角与普通框架结构相近,均在规范限值内;罕遇地震作用下,损伤主要集中于底部两层的梁端。底层自复位结构的柱脚损伤小于普通框架结构,其残余位移角小于普通框架结构。A three-dimensional finite element model is established for both a multi-storey conventional frame structure and a bottom-storey self-centering frame structure in an area designed for an 8-intensity seismic fortification(0.2g),modelled using the finite element software ABAQUS.Four ground motion records are selected and amplified to the peak accelerations of 0.07g and 0.4g,respectively,to conduct elastic-plastic time history analysis.The dynamic responses and damage patterns of the two structures under seismic actions are compared.Numerical simulation results indicate that the inter-storey drift ratio of the self-centering frame structure is similar to those of the conventional frame structure and is within the specified limits in the standard.Under severe seismic loads,the damage is mainly propagated on the beam ends of the bottom two storeys.The damage to the column bases of the bottom-storey self-centering structure is lighter than that of the conventional frame structure.The residual displacement of the self-centering frame structure is much smaller than that of the conventional frame structure.

关 键 词：底层自复位框架结构 ABAQUS 弹塑性时程分析 抗震性能 

分 类 号：TU352.11[建筑科学—结构工程]