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采用反应谱法和时程分析法,对位于首都机场的四机位机库进行了竖向、水平及其组合地震反应分析,考察地震作用对大跨度维修机库屋盖结构的影响。分析结果表明:屋盖杆件在竖向地震作用下的内力分布与在水平地震作用下的有明显的不同,也不同于一般四边支承的大跨度屋盖结构;屋盖结构的水平地震作用大于竖向地震作用;在三向地震作用下屋盖杆件的地震内力分布不同于任何单向地震作用情况,也不是三向地震的简单组合;网架与大门架、中梁桁架连接的部位,大门架、中梁桁架及网架静内力较小的杆件,中弦杆件及网架周边杆件是屋盖结构在地震作用下的薄弱环节。分析结果可供大跨度维修机库结构抗震设计参考。
Using response spectrum and time history analysis, the vertical and horizontal seismic response analysis of the four-position hangar at Capital Airport was carried out to investigate the effect of earthquake on the roof structure of long-span maintenance hangar. The analysis results show that the internal force distribution of roof bar under vertical earthquake is obviously different from that under horizontal earthquake and also different from that of the general long-span roof supported by four sides. The horizontal seismic action of roof is greater than Vertical seismic action; under the action of three-way earthquake, the seismic internal force distribution of the roof member is different from that of any unidirectional earthquake, nor is it a simple combination of three-direction earthquakes. The connection between the gantry and the gantry, The gantry, the truss girder and the smaller static internal force of the truss, the middle chord and the surrounding bar are the weak links of the roof structure under the earthquake. The results of the analysis can be used as reference for seismic design of hangar structure with long-span maintenance.