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正确认识梁式托柱结构的抗震性能,是对此类型转换层结构进行合理抗震设计的基础。以某多层带梁式托柱转换层的钢筋混凝土框架为研究背景,分别建立了3种不同柱截面尺寸的梁式托柱转换层结构有限元模型,采用Pushover方法对结构进行静力弹塑性分析,分别对小震和大震下具有不同柱截面尺寸的梁式托柱转换层结构的层间位移反应和塑性铰分布状态进行了分析比较,评价了梁式托柱转换层结构的抗震性能,并给出有益的设计建议。结果表明:小震作用下,柱截面尺寸变化对转换层下部结构的位移响应影响较小,转换层上部结构的层间位移角发生突变,且随着上托柱截面尺寸的增大,层间位移角表现出减小的趋势;大震作用下,柱截面尺寸变化对梁式托柱结构的层间位移角影响更大。此外,在转换层处和底层框架中易出现“强梁弱柱”现象。
A correct understanding of the seismic behavior of beam-column structures is the basis for a reasonable seismic design of this type of transition layer structure. Taking the reinforced concrete frame of a multi-storey girder with ply conversion layer as the research background, three kinds of finite element models of beam-ply conversion layer structure with different column cross-sectional dimensions were established respectively. Pushover method was used to simulate the static and elastic deformation of the structure, Analyzes and compares the layer displacement response and the plastic hinge distribution of the beam-ply transfer layer structure with different column cross-sections under small and large earthquakes respectively, and evaluates the seismic performance of the beam-ply transition layer structure , And give useful design suggestions. The results show that under the action of minor earthquakes, the variation of the cross section of column has less influence on the displacement response of the substructure of the transfer layer, and the layer displacement angle of the superstructure of the transfer layer changes suddenly. With the increase of the section size of the upper support column, The displacement angle shows a decreasing tendency. Under the action of large earthquake, the variation of the cross section of column has a greater influence on the drift angle of beam-column structure. In addition, “strong beam weak column ” appears easily in the conversion layer and the bottom frame.