水平地震下钢混结构梁柱抗震性能试验研究

Experimental study on seismic performance of steel-concrete structure beam and column under horizontal earthquake

设计不同腹板厚度与宽度的钢混结构梁柱试件,利用电液伺服拟动力加载系统模拟水平地震,研究水平地震作用下钢混结构梁柱抗震性能,分析钢材安装方式与钢材腹板形状等因素对梁柱剪切变形与耗能能力等抗震性能的影响。试验结果表明:斜向安装扩大十字形钢混结构梁柱的剪切变形较小、耗能能力较优;在钢混结构梁柱处安装加强板的试件滞回曲线未出现捏缩现象,剪切变形较小,有效延缓梁柱刚度及强度退化现象,提升抗震性能;轴压比与梁柱强度、刚度退化程度呈正比;腹板厚度越厚,梁柱的受剪承载力越大,抗震性能越佳。腹板宽度对梁柱受剪承载力影响较小,通过缩短腹板宽度缩减钢材尺寸,确保梁柱抗震性能较优。

The specimens with different web thicknesses and widths were designed,and the electro-hydraulic servo pseudo dynamic loading system was used to simulate horizontal earthquakes,and the seismic performance of steel composite beams and columns under horizontal earthquakes was studied.The effects of steel structure installation mode and steel web shape on the seismic performance of beam-columns,such as shear deformation and energy dissipation capacity,are analyzed.The test results show that the shear deformation of the beam-column of the extended cross steel composite structure is small and the energy dissipation capacity is good.There is no clamping phenomenon in the hysteretic curve of the specimens of steelconcrete structure beams and columns,and the shear deformation is small,which effectively delays the stiffness and strength degradation of the beams and columns,and improves the seismic performance.The axial compression ratio is proportional to the degradation degree of the strength and stiffness of the beam and column.The thicker the web thickness is,the greater the shear bearing capacity and the better the seismic performance of the beam-column.Web width has little influence on the shear strength of the beam-column,and the steel size can be reduced by shortening the web width to ensure better seismic performance of the beam-column.