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双重钢连柱钢支撑结构是由耗能段和支撑框架采用不同强度钢材构成的双重抗侧力体系。为了研究其在低周往复荷载作用下的滞回性能,设计了1组仅改变支撑框架钢材强度等级的连柱钢支撑试件。采用ABAQUS有限元分析软件建立有限元模型,并对试件进行了循环荷载作用下的非线性有限元分析。分析结果表明:提高支撑框架钢材强度等级,试件的极限承载力提高、剩余刚度增大、破坏程度减轻,有利于震后修复,但试件延性降低;耗能段可替换的层间侧移角下限基本不变,其上限提高明显。
Double-column steel column support structure is a dual anti-side force system composed of energy-consuming section and supporting frame made of different strength steel. In order to study its hysteretic behavior under low cycle reciprocating loads, a series of post-column steel support specimens that only change the strength level of the steel supporting the frame were designed. The finite element model was established by ABAQUS finite element analysis software, and the nonlinear finite element analysis of the specimen under cyclic loading was carried out. The results show that increasing the strength grade of the steel support frame increases the ultimate bearing capacity of the specimen and increases the residual stiffness and the degree of damage, which is in favor of post-earthquake repair, but the ductility of the specimen decreases; The lower limit of the angle is basically unchanged, and its upper limit is obviously increased.