带内隔板的方钢管混凝土柱-翼缘削弱型钢梁节点抗震性能研究

Research on Seismic Behavior of Connections with Reduced Beam Section (RBS) to Square Concrete-filled Steel Tubular Column with Internal Diaphragm

梁柱节点作为结构受力的关键部件,对结构体系的受力和抗震性能至关重要。在合理选取混凝土及钢材材料模型的基础上,本文采用ABAQUS有限元软件建立了方钢管混凝土柱-翼缘削弱型钢梁(RBS)内隔板式节点数值分析模型,分别进行了单调加载和往复加载下滞回性能的数值模拟,并将有限元模型计算结果与已有试验结果进行了对比,总体上吻合良好。基于此数值模型,对该类节点在低周往复荷载作用下的滞回性能进行了分析对比,并研究了翼缘削弱深度对RBS节点抗震性能的影响。结果表明,对梁翼缘进行削弱,不仅符合"强柱弱梁"的设计要求,还能明显改善普通钢管混凝土柱-钢梁内隔板式节点的延性,提高其抗震性能。并根据计算结果,本文对翼缘削弱深度的取值给出了初步建议。

As the key parts in the structures, the mechanical and seismic behavior of beam-column connections are significant. Based on logical material model of concrete and steel, finite element model （FEM） of the reduced beam sections （RBS） to square concrete- filled steel tubular （CFST） column connections with the inner-diaphragm is established using ABAQUS. The hysteretic behaviors of this connections are analyzed using the FEM under monotonic loading and low cycle cyclic loading scenario, the agreement between test results and predicted results is acceptable, the influence of the flange weaken depth to the seismic performance of connections are studied. The research results show that RBS connections not only can correspond to the strong column-weak beam design but also can improve the RBS to square CFST column connections with the inner-diaphragm＇ s ductility and seismic performance obviously. According to the research results of this paper, a preliminary recommendations about select parameter values are given.