内嵌式防屈曲支撑钢框架加固既有混凝土框架结构抗震性能分析

Seismic Performance Analysis of the Concrete Frames Rretrofitted with In-filled Steel Frames-BRBs

针对既有混凝土框架结构存在承载力、抗震性能不足等问题,本文在内嵌钢框架-防屈曲支撑加固既有框架的试验基础上,对两榀经该方法加固的框架-支撑结构、一榀纯框架结构进行有限元非线性分析,以便深入研究合理的加固参数。用ABAQUS建模,钢材采用硬化弹塑性模型,混凝土采用塑性损伤模型,采用单调水平加载位移增量控制方式进行有限元模拟分析,得出骨架曲线并与试验结果比对。在此基础上分析结构内部受力过程,内力重分配规律,研究钢框架-支撑及节点连接处工作状态,为以后采用类似加固方法进一步改进内部配置、优化结构设计提供科学依据。

The capacity of load bearing and seismic resistance performance on the existing frames are not enough to meet requirement.On the basis of an experimental study about reinforced concrete frames retrofitted with in-filled steel frames-BRBs,the non-linear finite element analysis on three models to get further reasonable retrofitting parameters is carried out. Two of them are retrofitted with in-filled steel frames BRBs（ BRBCF）,and the other one is an ordinary frame. During the finite element simulation process by ABAQUS,the load is applied with the method of displacement increment,and the model of steel is hardening elastic-plastic model,and the concrete＇s model is damaged plastic model. The skeleton curves which are obtained by numerical simulation are compared with the experiments.The procedure of structure inner load-bearing capacity,inner force re-distribution and the mechanical performance of joints are analyzed. It can supply with scientific basis for the following research with in-filled steel frames BRBs to improve inner structure,optimize structure design.