轴压比对空间异形柱框架抗震性能的影响

Influence to aseismic performance of 3D-frame with special-shaped columns by axial compression ratio

针对空间异形柱框架特点,运用非线性有限元计算程序,对在不同方向水平荷载作用下异形柱框架结构进行推覆分析,研究不同轴压比异形柱框架的破坏过程、承载力、延性、侧向位移、扭转、滞回性能及刚度退化等方面的抗震性能特点。结果显示,轴压比的增大对抗震性能有很大影响,尤其会降低框架的延性。

According to the features of 3D-frame with special-shaped columns, the calculation program for the structure＇s nonlinear finite analysis is used to study the aseismic performance of the 3D-frame with special-shaped columns such as failure process, bearing capacity, ductility, lateral displacement, torsion, hysteretie performance and stiffness degeneracy. The influence regularity on aseismic performance of the 3D-frame by axial compression ratio is discovered after the 3D-frame was analyzed by pushover under horizontal loading with various directions. Results show, the increment of axial compression ratio affects the aseismic performance of the frame obviously, especially for reducing the ductility of the frame.