An experimental study of the seismic performance of composite frames consisting of reinforced concrete (RC) columns and steel beams (S) is presented in this paper. Three frame specimens—one bare composite RCS frame without slab and two composite RCS frames with slab—were tested under cyclic loading. The test results indicate that two frame specimens with small‐scale steel beams exhibited better ductile behavior and dissipated energy, and the strength and stiffness degradation of the postelastic stage was not obvious. The results indicate that using a slab in the frame is not a good way to improve structural bearing capacity when the linear stiffness of steel beams is large. A plastic limit analysis method is proposed to calculate the lateral ultimate bearing capacity of an RCS frame under seismic action. The calculated results agree well with the test. Three RCS frame specimens were simulated using ABAQUS finite element analysis software. A comparison of the results of the numerical study with the experimental results demonstrates that the finite element model can accurately predict the structural behavior.

中文翻译：

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复合RCS框架抗震性能的试验研究与数值分析

本文对钢筋混凝土（RC）柱和钢梁（S）组成的复合框架的抗震性能进行了试验研究。在循环载荷下测试了三个框架样本（一个不带平板的裸复合RCS框架和两个带平板的复合RCS框架）。试验结果表明，两个小尺寸钢梁框架试样具有较好的延性和耗散能量，后弹性阶段的强度和刚度退化不明显。结果表明，当钢梁的线性刚度较大时，在框架中使用平板不是提高结构承载力的好方法。提出了一种塑性极限分析方法来计算RCS框架在地震作用下的侧向极限承载力。计算结果与试验结果吻合良好。使用ABAQUS有限元分析软件模拟了三个RCS框架标本。数值研究结果与实验结果的比较表明，有限元模型可以准确地预测结构行为。