摘要
为研究型钢混凝土异形柱框架的抗震性能,对1/4缩尺空间框架模型进行了地震模拟振动台试验,观察了模型在不同烈度地震作用下的破坏情况。采用OpenSees程序建立有限元模型进行动力分析,通过模型的动力特性、加速度反应及位移反应的对比,计算结果与试验结果吻合较好,进而对结构的楼层位移和层间位移角沿高度的分布及构件的应变和弯矩-曲率滞回曲线进行了分析。结果表明:型钢混凝土异形柱空间框架地震破坏时梁端先于柱端形成塑性铰,整体变形呈剪切型;与L形角柱及十形中柱相比,T形边柱受力更为不利;与中框架梁相比,边框架梁受力更为不利。
In order to investigate the seismic performance of the steel reinforced concrete(SRC)frame with special shaped columns,a 1/4 scale model was tested on the shaking table.The damage pattern of the frame was observed under seismic waves of different intensities.The finite element model of the frame was established using OpenSees program to conduct dynamic analysis.Compared with the test results,including the dynamic characteristics,acceleration response and displacement response,it is shown that the calculation results are reliable.The maximum floor displacements,the maximum inter-story drift ratios of the frame,as well as the strain and moment-curvature hysteretic curves of the beams and columns were analyzed.The results show that under earthquake,the plastic hinges form earlier at the beam ends than at the column ends.The integral lateral displacement of the frame is shearing-type.Compared with the L-shaped corner column and the cross-shaped middle column,the Tshaped exterior column is in the worst mechanical state.Beams of the exterior frame are in the worse mechanical state than that of the middle frame.
引文
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