防屈曲支撑混凝土框架抗震性能非线性有限元分析

Nonlinear Finite Element Analysis on the Seismic Performance of Buckling Restrained Brace Concrete Frames

基于非线性有限元软件ABAQUS,对设置防屈曲支撑的混凝土框架在单向水平荷载作用下的骨架曲线进行了非线性有限元模拟分析,并与试验结果进行了对比。分析过程中混凝土采用损伤塑性模型,钢材采用硬化弹塑性模型,采用位移增量法进行控制加载。在试验基础上进行的非线性有限元分析,分析了结构内部受力过程、内力分配及重分配规律、改进内部配置、优化结构设计,可为进一步研发、改进内部构造提供模型基础等,弥补了试验试件不能过多,应变片被损坏等不理想情况。

Based on ABAQUS of the non-linear finite element models, the BRB-concrete frames under single lateral load are analyzed and compared with the experiment study. Damaged placity model is accepted for concrete, hard placity model is accepted for steel, and displacement incretement is used to load in the analysis. The paper is centralized in study of BRB-concrete frame using infinite element means on base of our experiment study. The paper includes that analysis of structure load-bearing capacity, stress-strain proceeding in the frames, inner force distribution and re-distribution, improve inner structure, optimize structure design; further more, it also supplies with model for the following research and inner structure＇ s optimization, compensating the experimental specimens not be too many and the instances of strain gauge destroyed.