【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。更多还原

【Abstract】 Large-span connected trusses in high position of a connected structure are analyzed by pseudo excitation 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 earthquake 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 considering the wave-passage effect,so the vertical wave-passage effect can be ignored in structure design.更多还原