多维多点激励下老山自行车馆屋盖结构的地震反应分析

Seismic Response of the Roof Structure of Laoshan Cycling Gymnasium Under Multi-Dimensional and Multi-Point Excitation

采用有限元动力时程法,分析了老山自行车馆在多遇地震及罕遇地震下的反应,考虑了地震运动的多维性,并研究了地震行波效应对结构的影响.将静力等效方法应用于大跨度结构抗震设计中,把复杂的地震作用转化为结构静力荷载,为大跨度空间结构考虑行波效应时的抗震概念设计提供简单易行的方法.结果表明:地震行波对网壳边缘处的杆件影响不大,对网壳中部杆件内力影响较大,且波速越小中部杆件内力越大;行波效应对大跨度空间结构影响显著,设计时应予考虑;在类似结构初步设计中,罕遇地震静力等效系数可取2.0,多遇地震静力等效系数可取1.27。

The seismic response of the roof structure of Laoshan cycling gymnasium under normal and infrequent earthquakes with multi-dimensional was analyzed by transient dynamic finite element method and the influence of wave propagation effect on structures was also investigated. The method converting the earthquake action into static load was applied to the anti-seismic design of large-span spatial structures. The results indicate that seismic wave propagation effect on rim member bars is not great, but on the central member bars is obviously great. When the wave velocity decreases, the internal force of central member bars increases. The wave propagation effect on large-span spatial structure is obvious, which should be taken into account. The recommended static load factor is 2.0 under infrequent earthquake and 1.27 under normal earthquake for designing such structures.