错位转换高层建筑结构竖向地震作用下的抗震性能研究
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摘要
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,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。
A practical project of vertical aseismic analysis on high-rise building with stagger transfer stories was studied numerically with SAP2000V9 program. The effect of number of vertical modes on the internal forces in the upper and lower transfer beams and the axial-forces in main vertical components was considered. Vertical acceleration, vertical drift and vertical dynamic strain were computed, the dynamic responses at end points and supporting column points on the upper and lower transfer beams in different stories were calculated and compared between themselves when earthquake waves are input. The axial-forces in columns on upper and lower transfer beams, frame supported shear walls and columns supporting shear walls were calculated and compared with the values under representative gravity load. The result shows the basic vertical mode plays a very important role for effect on the internal forces in transfer beams and the axial-forces in main vertical components, while the modes above the 5th mode have little effect on them. The displacements and accelerations at the column points on the transfer beams are greater than those at the end points. The vertical strains in vertical components at the end points of the upper and lower transfer beams have sudden change in the stories which are just above the two transfer stories. The vertical strains in vertical components in the stories between two stagger transfer structures increase locally. The higher the location of the vertcial component is, the greater the proportion of the internal force calculated by the response spectrum method to that by the representative gravity load method. Under vertical earthquake, the axial forces in supporting shear wall in the top story and in frame supported shear wall in the three bottom stories will bear sudden change.
A practical project of vertical aseismic analysis on high-rise building with stagger transfer stories was studied numerically with SAP2000V9 program. The effect of number of vertical modes on the internal forces in the upper and lower transfer beams and the axial-forces in main vertical components was considered. Vertical acceleration, vertical drift and vertical dynamic strain were computed, the dynamic responses at end points and supporting column points on the upper and lower transfer beams in different stories were calculated and compared between themselves when earthquake waves are input. The axial-forces in columns on upper and lower transfer beams, frame supported shear walls and columns supporting shear walls were calculated and compared with the values under representative gravity load. The result shows the basic vertical mode plays a very important role for effect on the internal forces in transfer beams and the axial-forces in main vertical components, while the modes above the 5th mode have little effect on them. The displacements and accelerations at the column points on the transfer beams are greater than those at the end points. The vertical strains in vertical components at the end points of the upper and lower transfer beams have sudden change in the stories which are just above the two transfer stories. The vertical strains in vertical components in the stories between two stagger transfer structures increase locally. The higher the location of the vertcial component is, the greater the proportion of the internal force calculated by the response spectrum method to that by the representative gravity load method. Under vertical earthquake, the axial forces in supporting shear wall in the top story and in frame supported shear wall in the three bottom stories will bear sudden change.
引文
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[3]单蕴平.试论竖向地震作用是引起建筑物破坏的主要因素[J].江苏建筑,1996,15(1):30-33.
[4]陈天镭,高启贵.竖向地震对高柔结构的影响[J].甘肃冶金,2005,27(2):26-27.
[5]Bai Shaoliang,Li Zhengliang,Yuan Zhengqiang.Vertical seismicaction on megastructure systems of tall buildings[J].Journal ofChongqing Jianzhu University,1998,Vol.20(6):1-6.
[6]张永康,刘洪兵.巨型框架结构竖向地震作用下抗震性能研究[J].工程抗震与加固改造,2005,27(3):17-19.
[2]张硕英,张剑霄.多层框架结构竖向地震反应的反应谱分析法[J].西安建筑科技大学学报,1996,28(4):454-458.
[3]单蕴平.试论竖向地震作用是引起建筑物破坏的主要因素[J].江苏建筑,1996,15(1):30-33.
[4]陈天镭,高启贵.竖向地震对高柔结构的影响[J].甘肃冶金,2005,27(2):26-27.
[5]Bai Shaoliang,Li Zhengliang,Yuan Zhengqiang.Vertical seismicaction on megastructure systems of tall buildings[J].Journal ofChongqing Jianzhu University,1998,Vol.20(6):1-6.
[6]张永康,刘洪兵.巨型框架结构竖向地震作用下抗震性能研究[J].工程抗震与加固改造,2005,27(3):17-19.
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