型钢混凝土异形柱框架非线性地震反应分析

Nonlinear seismic response analysis of steel reinforced concrete frame with special-shaped columns

为研究型钢混凝土(SRC)异形柱框架在输入地震动作用下的非线性反应,采用Opensees平台建立有限元模型进行数值模拟。经试验结果和Sap2000计算结果的验证,Opensees的计算结果较为合理。根据计算结果,给出SRC异形柱框架在El Centro波、Taft波和兰州波作用下的位移、加速度、基底剪力等时程曲线,并对其进行了分析。结果表明,SRC异形柱框架在地震作用下的变形整体上呈剪切型,位移曲线沿高度呈倒三角分布;随着输入地震动加速度峰值的增大,SRC异形柱框架的加速度反应动力放大系数逐渐减小,基底剪力的增长速度为先快后慢。

In order to study the nonlinear seismic response of steel reinforced concrete frame with special-shaped columns by input seismic wave,the finite element model was established using Opensees to conduct numerical simulation. Verified by test and Sap2000,the model was appropriate. According to the calculated results,the timehistory curves of displacement,acceleration and base shear are obtained and analyzed. The results show that the deformation of SRC frame with special-shaped columns by seismic action is shear-type and the curve of displacement along the height appears inverted triangular distribution. As the peak acceleration of input seismic waves increasing,the dynamic magnification of acceleration of SRC frame with special-shaped columns decreases,and the increasing speed of base shear is fast first and then slow.