中文摘要：

采用绝对位移直接求解的虚拟激励法，利用ANSYS有限元分析软件的谐响应分析模块，对某大跨度高位连体结构进行竖向一致、行波激励下的地震响应随机振动分析。结果表明：大跨度高位连体桁架竖向地震作用系数明显比《建筑抗震设计规范》给出的屋架竖向地震作用系数大，平均增幅达50％左右；竖向行波激励能减小连体桁架的动力响应，设计时不需考虑竖向地震行波效应。

英文摘要：

Large-span connected trusses in high position of a connected structure are analyzed by pseudo exci- tation method based on solving absolute displacement in ANSYS harmonic response analysis program, considering vertical uniform and wave-passage earthquake excitations. The results showed that the coefficients of vertical earth- quake action of large-span truss in high position are larger than the coefficients of large-span roof truss provided by national code for seismic design of buildings, and the amplitudes of the coefficients of vertical earthquake action may be increased by 50% in average. The axial forces of members of large-span truss have been decreased when consid- ering the wave-passage effect, so the vertical wave-passage effect can be ignored in structure design.