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为研究实腹式型钢混凝土十字形截面柱的抗震性能,以1榀3层2跨异形柱中框架为原型,通过拟静力试验预先获得不同轴压比下对比柱的基本受力性能。构建了Open Sees-Open Fresco-MTS抗震混合试验系统,取底层十字形截面中柱作为试验单元,并利用四连杆设备进行加载,其余部分作为计算单元,基于Open Sees软件进行模拟,将模拟结果作为目标位移进行加载,观察各试件的受力过程及破坏特征,获得了试件的滞回曲线和骨架曲线,对比分析了承载力、延性、耗能及刚度退化等。研究结果表明:随着轴压比的增大,各试件的力学特征值均降低,但弹性刚度不变;与拟静力试验中各对比试件相比,地震作用的随机性对混合试验中各构件的抗震性能影响较大,导致其某一方向承载力和刚度大大降低;历经混合试验的震后损伤试件仍然具有对比试件75%的承载能力。
In order to study the seismic behavior of CFRP cross-section columns, the basic mechanical properties of the RC columns under different axial compression ratios were obtained in the quasi-static test by taking the 1/3-story and 2-beam special-shaped columns as the prototype. The Open Sees-Open Fresco-MTS earthquake-resistant hybrid test system was constructed. The bottom cross-section column was used as the test unit and loaded with four-bar linkage. The rest was used as the calculation unit and simulated by Open Sees software. As the target displacement, the loading process and failure characteristics of each specimen were observed. The hysteresis curve and skeleton curve of the specimen were obtained. The bearing capacity, ductility, energy consumption and stiffness degradation were compared. The results show that with the increase of axial compression ratio, the mechanical characteristic value of each specimen decreases, but the elastic stiffness does not change. Compared with the test specimens in the quasi-static test, the randomness of the quake effect on the mixing test The seismic performance of each component has a greater impact, resulting in a significant reduction of the bearing capacity and stiffness in one direction. After the hybrid test, the damage specimen still has the bearing capacity of 75% of the comparative specimen.