半刚接柱脚低层规则钢框架损伤分布机理分析

针对低层规则钢框架损伤分布机理不明确,以钢框架的强柱系数、首层剪重比为主要研究参量,建立8个半刚接柱脚三层规则钢框架模型；通过弹塑性分析,研究半刚接柱脚低层规则钢框架损伤分布机理。结果如下：柱、梁均刚接的模型首层变形集中,为防止首层破坏,强柱系数要求在1.9以上；有轴力柱的模型各层层间位移分布较均匀,然而刚接梁端部和半刚接柱脚地震需求性能较大；随着强柱系数的增大,梁的延性比和累积塑性延性比均增大。

Damage distribution Mechanism Analysis for Low-layer Inerratic Steel Frame with Semi-rigid Column Base

Considering the unclear damage distribution mechanism of the low-layer inerratic steel frame, 8 semi-rigid column based inerratic steel frames of 3 layers are built with both the strong column coefficient and the first floor shear-weight ratio are included as the main parameters by the means of elasto-plastic analysis method for study the damage distribution mechanism of the low-layer inerratic steel frame. The results are: the deformation concentrates at the first flood with the rigid columns and beams connection style, in order to prevent damage to the first floor, the strong column factor should be controlled with the value more than 1.9; story drifts distribute more uniform within the model with the axis-column, and seismic demand performance needs more in the regions both of rigid beam-end and of semi-rigid column base; with the increase of strong column coefficient, both the beam ductility ratio and cumulative plastic ductility ration increase consequently.