竖向框排架结构中排架柱抗震性能研究

Seismic behavior of bent frame column in vertical frame-bent structure

为研究竖向框排架结构中排架柱的抗震性能,选取一榀典型竖向框排架结构作为研究对象,完成了缩尺比为1∶5的结构模型的拟静力试验,并采用ABAQUS有限元软件对其进行了数值模拟。对竖向框排架结构中排架柱的破坏特征、骨架特性、延性、耗能能力、层间位移角等进行了分析,研究了长细比和轴压比对排架柱抗震性能的影响。结果表明:排架柱的破坏模式为弯曲破坏;由于偏心距较大,不同加载方向下的排架柱的水平承载能力存在较大差别;排架柱的延性和耗能能力随长细比和轴压比的增加显著降低,建议将同类结构的排架柱长细比和轴压比分别控制在45和0.2以下。

In order to study the seismic behavior of bent frame column in vertical frame-bent structure, some representative components of a vertical frame-bent structure were selected as the research objects and the quasi-static test of a 1/5 scaled model and ABAQUS analysis were conducted. The study focused on the failure patterns, hysteretic characteristics, ductility, energy dissipation capacity and inter-story drift ratio of the specimen. On this basis, the seismic performance of bent frame column under different slenderness ratios and axial compression ratios were studied according to numerical simulation. Results show that the main failure mode of the specimen is bending failure, which occurs at the bottom of bent frame column. The horizontal bearing capacity is obviously different under loading in different directions with significant eccentricity. The ductility and energy dissipation capacity reduce significantly with the increase of slenderness ratio and axial compression ratio of bent frame column. It is suggested that the slenderness ratio should be less than 45 and the axial compression ratio should be less than 0.2.