【摘要】 近年来,随着经济的快速发展,为了追求建筑效果,大跨空间结构得到广泛的应用,平面布置不规则的情况占大多数。目前针对大跨空间结构地震响应分析中,地震动的输入方向一般只以两个坐标轴为输入方向,对于结构体型复杂、扭转效应明显的结构,地震动的输入角度对结构的地震响应将产生很大的影响。本文以某待建三边支承的大跨度高支承飞艇库为研究对象,利用SAP2000有限元分析软件,分别采用反应谱法和弹性时程分析方法,研究了其在不同输入角度下水平双向地震响应。结果表明,采用反应谱分析时,随着输入角度增加,结构的地震响应呈增加趋势,但是幅度不大;采用弹性时程分析方法时,结构的地震响应随输入角度的增加增幅较大。因此,有必要在抗震分析与设计中考虑不同输入角度的影响。更多还原

【Abstract】 In recent years,with the rapid development of economy,the new long-span space structure were built in order to pursue the construction effect,and the irregular layout situations is also majority.At present,for seismic response analysis of long span structure,the input direction of ground motion is generally along the two axes.For the structure which have complex shape and clear reverse effects,the input angle of ground motion will produce greatly effect to the seismic response.In this paper,take a long span-high supported airship shed to be built as the study example,the software of SAP2000 is used,the mode-superposition response spectrum method analysis and elastic time history analysis are carried out respectively to study the earthquake response under two-way horizontal earthquake with different input angle.The results show that: when using the mode-superposition response spectrum analysis,with the input angle increased,the seismic response is increased,but amplitude is little;when using the elastic time-history analysis method,the seismic response increased largely with the input angle increased.Therefore,it is necessary to consider the different input angles in seismic analysis and design.更多还原