地震动差动作用下大跨度空间网壳结构的反应分析
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摘要
选取100 m跨度的双层柱面网壳结构为研究对象,采用时程分析法,分别进行了结构在单向和三向地震行波输入作用下的反应分析,并针对多种视波速情况进行了研究,考查了地震动不同输入情况下结构杆件内力的分布特点,对其进行了对比分析,为大跨网壳结构的抗震设计提供了理论依据。研究表明,考虑行波效应会使结构部分构件内力有一定程度的提高,多维地震作用比单维地震作用下结构的杆件内力大。由此得出结论:对于大跨度空间网壳结构,应该进行多维非一致输入下的地震反应分析;为保证抗震安全,应对可能出现的地面视波速进行全面分析。
A double-layer cylindrical reticulated shell of 100m span was selected as a research object to analyze its dynamic behaviors subjected to seismic excitations of one and three-dimensional wave passage effects with the time history method,including many cases of apparent wave velocities.The characteristics of the distribution of element forces under those seismic motions have been examined to compare and contrast the different situations,which provides a theoretic foundation for the ascismic design of long-span structures.The results show that the stresses of some members increase if considering the wave passage effect,and the internal forces of structural members under the multi-dimensional seismic excitation are larger than that under one-dimensional seismic excitation.Some conclusions have been drawn that the seismic analysis with non-uniform excitations of multi-dimensional seismic motions must be performed for the long-span spatial reticulated shell structures,and a comprehensive analysis should be carried out for possible traveling wave velocities to make ensure the seismic safety.
A double-layer cylindrical reticulated shell of 100m span was selected as a research object to analyze its dynamic behaviors subjected to seismic excitations of one and three-dimensional wave passage effects with the time history method,including many cases of apparent wave velocities.The characteristics of the distribution of element forces under those seismic motions have been examined to compare and contrast the different situations,which provides a theoretic foundation for the ascismic design of long-span structures.The results show that the stresses of some members increase if considering the wave passage effect,and the internal forces of structural members under the multi-dimensional seismic excitation are larger than that under one-dimensional seismic excitation.Some conclusions have been drawn that the seismic analysis with non-uniform excitations of multi-dimensional seismic motions must be performed for the long-span spatial reticulated shell structures,and a comprehensive analysis should be carried out for possible traveling wave velocities to make ensure the seismic safety.
引文
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[2]李宏男.结构多维抗震理论[M].北京:科学出版社, 2006. Li H N.Earthquake Resistant Theory of Structures to Multi-Dimensional Excitations[M].Beijing:Science Press,2006.
[3]项海帆.斜张桥在行波作用下的地震反应分析[J].同济大学学报,1983,11(2):1-9. Xiang H F.Earthquake response analysis of cablestayed bridges under the action of traveling waves[J]. Journal of Tongji University,1983,11(2):1-9.
[4]梁嘉庆,叶继红.多点输入下大跨度空间网格结构的地震响应分析[J].东南大学学报(自然科学版),2003, 33(5):625-630. Liang J Q,Ye J H.Seismic response analysis of longspan space lattice structures under multiple-support excitation[J].Journal of Southeast University(Natural Science Edition),2003,33(5):625-630.
[5]Su L,Dong S L,Kato S.Seismic design for steel trussed arch to multi-support excitations[J].Journal of Constructional Steel Research,2007,63(6):725- 734.
[6]Loh C H,Ku B D.An efficient analysis of structural response for multiple-support seismic excitations[J]. Engineering Structures,1995,17(1):15-26.
[7]李建俊,林家浩,张文首,等.大跨度结构受多点随机地震激励的响应[J].计算结构力学及其应用,1995,12 (4):445-452. Li J J,Lin J H,Zhang W S,et al.Responses of longspan structures subjected to arbitrarily coherent multi -point stationary random seismic excitations[J]. Computational Structural Mechanics and Applications, 1995,12(4):445-452.
[8]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 T,Zhang Y G.Seismic Design of Long-span Roof Structures[M].Beijing:China Architecture & Building Press,2000.
[9]Clough R W,Penzien J.结构动力学[M].北京:科学出版社,1981. Clough R W,Penzien J.Dynamics of Structures[M]. Beijing:Science Press,1981.
[10]陈幼平,周宏业.斜拉桥地震反应的行波效应[J].土木工程学报,1996,29(6):61-68. Chen Y P,Zhou H Y.Seismic behavior of cablestayed bridges under traveling wave excitation[J]. China Civil Engineering Journal,1996,29(6):61-68.
[11]张锦虹,陈扬骥.双层圆柱面网壳的抗震性能研究[J].同济大学学报,1998,26(5):498-502. Zhang J H,Chen Y J.Studies on dynamical earthquake performances of double-layer cylindrical latticed shell[J].Journal of Tongji University,1998,26(5): 498-502.
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