大跨弦支穹顶结构的动力反应分析
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摘要
采用大型有限元软件ANSYS对大跨弦支穹顶结构的自振特性和地震响应进行了计算分析.考虑了不同初始状态对结构频率分布及振型特征的影响,比较了弦支穹顶结构和单层网壳结构自振特性的差异.计算了多点地震动波速输入下,大跨弦支穹顶结构的动力反应.研究结果表明,行波效应对大跨弦支穹顶结构的地震响应影响显著,特别是当多点输入相位差较大时,结构的内力和位移峰值都会有明显的增大,当场地土土质较软时不能忽略行波时滞的影响;常遇地震输入下,大跨弦支穹顶结构的位移和内力变化都较小,计算中可以不考虑几何和材料的非线性.
Dynamic characteristics and earthquake response of long span suspend-dome structure have been analyzed with large scale finite element software ANSYS.The influence of various initial states on the structural frequency distribution and mode shape characteristics has been investigated and self-vibration characteristics of suspend-dome structure and latticed shell structure have been compared.The dynamic responses of long span suspend-dome structure to different wave speeds of the ground motion have been calculated.Research results show that traveling wave effect has much influence on the seismic response of long span suspend-dome structure.With a bigger multipoint input phase difference,the structural internal force and peak displacement increase significantly.Delay of the traveling wave cannot be ignored when the ground soil is soft.Displacement and internal force changes of long span suspend-dome are small under the condition of frequent earthquake,so the nonlinearity of geometry and materials can be ignored in calculation.
Dynamic characteristics and earthquake response of long span suspend-dome structure have been analyzed with large scale finite element software ANSYS.The influence of various initial states on the structural frequency distribution and mode shape characteristics has been investigated and self-vibration characteristics of suspend-dome structure and latticed shell structure have been compared.The dynamic responses of long span suspend-dome structure to different wave speeds of the ground motion have been calculated.Research results show that traveling wave effect has much influence on the seismic response of long span suspend-dome structure.With a bigger multipoint input phase difference,the structural internal force and peak displacement increase significantly.Delay of the traveling wave cannot be ignored when the ground soil is soft.Displacement and internal force changes of long span suspend-dome are small under the condition of frequent earthquake,so the nonlinearity of geometry and materials can be ignored in calculation.
引文
[1]尹越,韩庆华,谢礼立,等.一种新型杂交空间网格结构——弦支穹顶[J].工程力学,2001,1(增):772-776.Yin Yue,Han Qinghua,Xie Lili,et al.A new style of space grid structure:Suspend-dome[J].Engineering Mechanics,2001,1(Suppl):772-776(in Chinese).
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[3]Kawaguchi Mamoru,Abe Masaru,Tatemichi Ikuo.De-sign,tests and realization of suspend-dome system[J].Journal of IASS,1999,40(131):179-192.
[4]Kawaguchi Mamoru,Abe Masaru,Tatsuo Hatato,et al.Structural tests on a full-size suspend-dome structure[C]//Proceedings of IASS Symposium.Atlanta,1994:383-392.
[5]Kawaguchi Mamoru,Tatemichi Ikuo,Chen Pei Shan.Optimum shapes of a cable dome structure[J].Engineer-ing Structures,1999,21(8):719-725.
[6]Loh C H,Ku B D.An efficient analysis of structural response for multi-support seismic excitation[J].Engi-neering Structures,1995,17(1):15-26.
[7]崔晓强,郭彦林.弦支穹顶结构的抗震性能研究[J].地震工程与工程振动,2005,25(1):67-75.Cui Xiaoqiang,Guo Yanlin.Seismic behaviors of sus-pend-dome structure[J].Earthquake Engineering and Engi-neering Vibration,2005,25(1):67-75(in Chinese).
[8]张志宏,张明山,董石麟.弦支穹顶结构动力分析[J].计算力学学报,2005,22(6):646-650.Zhang Zhihong,Zhang Mingshan,Dong Shilin.Dynamic analysis of suspend-dome[J].Journal of Computational Mechanics,2005,22(6):646-650(in Chinese).
[9]邸龙,楼梦麟.单层柱面网壳在多点输入下的地震反应[J].同济大学学报:自然科学版,2006,34(10):1293-1298.Di Long,Lou Menglin.Seismic response analysis of single layer cylindrical reticulated shell under multi-support excitations[J].Journal of Tongji University:Natural Science,2006,34(10):1293-1298(in Chinese).
[10]Morris N F.Dynamic analysis of cable-stiffened structures[J].J Struct Div,1974,100(5):971-981.
[2]李禄.基于张拉整体理论的弦支穹顶结构的理论和试验分析[D].天津:天津大学建筑工程学院,2000.Li Lu.Suspend-Dome Structure Theory and Experimen-tal Analysis Based on the Tensegrity Theory[D].Tianjin:School of Civil Engineering,Tianjin University,2000(in Chinese).
[3]Kawaguchi Mamoru,Abe Masaru,Tatemichi Ikuo.De-sign,tests and realization of suspend-dome system[J].Journal of IASS,1999,40(131):179-192.
[4]Kawaguchi Mamoru,Abe Masaru,Tatsuo Hatato,et al.Structural tests on a full-size suspend-dome structure[C]//Proceedings of IASS Symposium.Atlanta,1994:383-392.
[5]Kawaguchi Mamoru,Tatemichi Ikuo,Chen Pei Shan.Optimum shapes of a cable dome structure[J].Engineer-ing Structures,1999,21(8):719-725.
[6]Loh C H,Ku B D.An efficient analysis of structural response for multi-support seismic excitation[J].Engi-neering Structures,1995,17(1):15-26.
[7]崔晓强,郭彦林.弦支穹顶结构的抗震性能研究[J].地震工程与工程振动,2005,25(1):67-75.Cui Xiaoqiang,Guo Yanlin.Seismic behaviors of sus-pend-dome structure[J].Earthquake Engineering and Engi-neering Vibration,2005,25(1):67-75(in Chinese).
[8]张志宏,张明山,董石麟.弦支穹顶结构动力分析[J].计算力学学报,2005,22(6):646-650.Zhang Zhihong,Zhang Mingshan,Dong Shilin.Dynamic analysis of suspend-dome[J].Journal of Computational Mechanics,2005,22(6):646-650(in Chinese).
[9]邸龙,楼梦麟.单层柱面网壳在多点输入下的地震反应[J].同济大学学报:自然科学版,2006,34(10):1293-1298.Di Long,Lou Menglin.Seismic response analysis of single layer cylindrical reticulated shell under multi-support excitations[J].Journal of Tongji University:Natural Science,2006,34(10):1293-1298(in Chinese).
[10]Morris N F.Dynamic analysis of cable-stiffened structures[J].J Struct Div,1974,100(5):971-981.
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