错位转换高层建筑结构竖向地震作用下的抗震性能研究

关于错位转换高层建筑结构在竖向地震作用下的动力特性和受力特性的研究目前还鲜有文献，本文采用Sap2000V9有限元程序对一实际带错位转换高层结构竖向动力特性和动力反应进行了分析研究。研究了竖向振型数对上、下部转换梁内力和主要竖向受力构件轴力的影响；用反应谱法和时程分析法计算了竖向加速度、竖向层间位移及竖向动应变，分析了上部、下部转换梁梁端点及梁托柱点所在位置节点动力反应随楼层变化情况，并将转换梁端点的反应和梁托柱的反应进行了对比分析研究。还计算了上、下部转换层梁托柱、承托墙肢、框支剪力墙、框支柱等的轴力，并将其与重力荷载代表值下轴力比值进行了对比研究。研究分析表明，竖向基本振型对构件内力起主要作用，竖向第5阶以上振型对转换梁和各竖向主要构件轴力影响很小；梁托柱点竖向位移、竖向加速度远大于其梁端点的反应；上、下部转换梁端点处竖向构件竖向应变在转换层上一层发生突变；同时会使两错位转换层之间楼层竖向构件竖向应变局部增大；楼层越高，其相应竖向构件的反应谱法与重力荷载代表值、时程均值与重力荷载代表值内力比值就越大；竖向地震作用下承托墙肢顶部一层和框支剪力墙底部三层轴力会发生突变。

Vertical aseismic performance of high-rise building with stagger transfer stories

There are little literatures about vertical dynamic characteristic and seismic performance on high-rise building with stagger transfer stories, in this paper, one coming from practical project will be studied with SAP2000V9 program. The effect of number of vertical modes on the internal force of the upper, lower transfer beam and the axis-force of main vertical components are studied. Vertical acceleration, vertical drift and vertical dynamic strain are computed, the dynamic response at the end point, column point on the upper, lower transfer beams with different stories are researched and compared when earthquake waves and spectrum are input. The axis-force of the columns on the upper, lower transfer beams, supporting shear wall, shear wall supported by frames, columns supporting shear walls are calculated when earthquake waves and spectrum are input, and compared to the value under the representative gravity load. The result shows the basic vertical modal plays a very important role in effect on the internal force of transfer beams and the axis-force of main vertical components, the modals above the 5th modal have little effect on them; the displacement and acceleration at the column point on the transfer beam are greater than those at the end points of the upper, lower beams; the vertical strain of the vertical component at the end point of the upper, lower transfer beams have sudden change at the stories which are just above the two transfer stories respectively, simultaneously the vertical strain of the vertical components at the stories between two stagger transfer structures increase partially; the higher the location of the vertcial component is, the greater the versus between the internal force of it under the spectrum load and that under the representative gravity load; under the vertical earthquake, the axis force of supporting shear wall at the top story and that of shear wall supported by frames at the three bottom stories will occurs sharply change.