大跨度机库结构多点输入地震反应分析

Seismic response analysis of two long-span hangars under multiple support excitations

采用时程分析法,对位于首都机场的北京A380机库和西安飞机总装厂房两个大跨度维修机库结构进行考虑行波效应的多点输入地震反应分析,并与一致输入的结果进行对比,考察多点输入以及不同视波速和不同地震波对两个机库屋盖杆件内力的影响。分析结果表明:多点输入对屋盖杆件内力的影响与结构本身的形式关系较大;行波效应大的杆件主要分布在网架中弦的长边跨中附近;不同地震波作用下,行波效应影响系数较大的杆件位置有所不同,但杆件数量分布规律基本相同。分析结果对于大跨度机库结构抗震设计考虑行波效应有指导意义。

Multiple support earthquake excitation time history analyses of Beijing A380 hangar structure at Capital International Airport and the general assembly building structure at Xi＇an Airplane were performed. The results were compared with these of the uniform support excitation. The effects of multiple support excitation, wave propagation velocity and earthquake input on the internal force of roof structural elements were evaluated. The results indicate： the structure form has a substantial effect on the member internal forces under multiple support excitation; chord members at the middle story of the roof space frame have large wave traveling effect factor; under the different earthquake input, the locations of members with relatively large wave traveling effect factor are not always the same, but the distribution pattern of the member number is about the same. The analysis results are significant for taking account of the effects of multiple support excitations in the earthquake resistant design of the long-span hangar structures.