型钢混凝土框架-核心筒结构罕遇地震作用下非线性响应分析

Nonlinear response analysis of SRC frame-core wall structures under rare earthquake

以一栋高层办公建筑结构为例,分别采用型钢混凝土框架-核心筒结构方案与钢筋混凝土框架-核心筒结构方案,进行罕遇地震作用下非线性响应对比研究。采用通用有限元分析软件平台ABAQUS建立分析模型,基于用户自定义材料接口引入混凝土损伤本构关系反映混凝土的开裂、压碎等非线性行为。在此基础上,对两种结构方案分别进行罕遇地震作用下的结构非线性时程分析。结果表明:采用型钢混凝土梁、柱构件并非总能达到改善结构整体罕遇地震作用下非线性性能的目的,在El Centro地震波作用下,采用型钢混凝土框架-核心筒结构方案较采用钢筋混凝土框架-核心筒结构方案的位移响应明显减小,而Chi Chi地震波作用下两方案位移响应差别不大,Taft地震波作用下结构采用型钢混凝土框架-核心筒方案时位移响应反而变大。

Two structural plans including the steel reinforced concrete( SRC) frame-core wall structure and the regular reinforced concrete frame-core wall structure for a high-rise office building were developed. The nonlinear seismic simulations for both structural plans were carried out under rare earthquakes. The finite element analysis platform ABAQUS was adopted for the numerical modelling,using the damage constitutive models to describe the cracking and crushing of concrete with the user defined materials. The structural displacement responses and the structural damage evolutions through the whole process were compared. Results show that under rare earthquakes the SRC beams and columns do not improve the nonlinear seismic performance of structures at all times. There is obvious reduction of displacement response of the SRC frame-core wall plan compared to the RC frame-core wall plan under El Centro seismic wave action. But the former showed almost the same displacement responses as the latter when Chi Chi seismic wave act on them and larger displacement response under Taft seismic wave.