多维多点激励下老山自行车馆屋盖结构的地震反应分析
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摘要
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.
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.
引文
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[2]刘洪兵,朱唏.大跨度斜拉桥多支承激励地震响应分析[J].土木工程学报,2001,34(6):38-44 Liu Hongbing,Zhu Xi.Seismic response analysis of long-span cable-stayed bridges under multi-support excitation[J].China Civil Engineering Journal,2001,34(6):38-44(in Chinese.)
[3]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.Pan Danguang,Lou Menglin,Fan Lichu.Status of seismic response analysis of long-span structures under multiple support excitations[J].Journal of Tongji University2,001,29(10):1213-1219(in Chinese.)
[4]蓝天,张毅刚.大跨度屋盖结构抗震设计[M].北京:中国建筑工业出版社,2000.Lan Tian,Zhang Yigang.Seismic Design of Long-Span Roof Structures[M].Beijing:China Architecture and Building Press,2000(in Chinese.)
[5]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.Cao Zi,Xue Suduo.Seismic Analysis and Design of Spatial Structures[M].Beijing:Science Press,2005(in Chinese.)
[6]丁阳,王波.大跨空间网格结构在地震行波作用下的响应[J].地震工程与工程振动2,002,22(5):71-76.Ding Yang,Wang Bo.Seismic response of long-span spatial lattice structure considering traveling-waves effects[J].Earthquake Engineering and Engineering Vibration,2002,22(5):71-76(in Chinese.)
[7]罗尧治,王荣.索穹顶结构动力特性及多维多点抗震性能研究[J].浙江大学学报,2005,39(1):39-45.Luo Yaozhi,Wang Rong.Study on dynamic characteristics and behavior of cable dome subjected to multi-dimensional and multi-point seismic excitations[J].Journal of Zhejiang University,2005,39(1):39-45(in Chinese.)
[8]林家浩,张亚辉,赵岩.大跨度结构抗震分析方法及近期进展[J].力学进展,2001,31(3):350-360.Lin Jiahao,Zhang Yahui,Zhao Yan.Seismic analysis methods of long-span structures and recent advances[J].Advances in Mechanics,2001,31(3):350-360(in Chinese.)
[9]周全智.大跨空间结构考虑行波效应的弹塑性地震反应分析[D].天津:天津大学建筑工程学院,2007.Zhou Quanzhi.Elasto-Plastic Earthquake Response of Large-span Spatial Structure under Wave Propagation Effect[D].Tianjin:School of Civil Engineering,Tianjin University,2007(in Chinese.)
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