大跨度高位连体桁架竖向地震响应随机振动分析
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摘要
采用绝对位移直接求解的虚拟激励法,利用ANSYS有限元分析软件的谐响应分析模块,对某大跨度高位连体结构进行竖向一致、行波激励下的地震响应随机振动分析。结果表明:大跨度高位连体桁架竖向地震作用系数明显比《建筑抗震设计规范》给出的屋架竖向地震作用系数大,平均增幅达50%左右;竖向行波激励能减小连体桁架的动力响应,设计时不需考虑竖向地震行波效应。
Large-span connected trusses in high position of a connected structure are analyzed by pseudo excitation method based on solving absolute displacement in ANSYS harmonic response analysis program,considering vertical uniform and wave-passage earthquake excitations.The results showed that the coefficients of vertical earthquake action of large-span truss in high position are larger than the coefficients of large-span roof truss provided by national code for seismic design of buildings,and the amplitudes of the coefficients of vertical earthquake action may be increased by 50% in average.The axial forces of members of large-span truss have been decreased when considering the wave-passage effect,so the vertical wave-passage effect can be ignored in structure design.
Large-span connected trusses in high position of a connected structure are analyzed by pseudo excitation method based on solving absolute displacement in ANSYS harmonic response analysis program,considering vertical uniform and wave-passage earthquake excitations.The results showed that the coefficients of vertical earthquake action of large-span truss in high position are larger than the coefficients of large-span roof truss provided by national code for seismic design of buildings,and the amplitudes of the coefficients of vertical earthquake action may be increased by 50% in average.The axial forces of members of large-span truss have been decreased when considering the wave-passage effect,so the vertical wave-passage effect can be ignored in structure design.
引文
[1]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
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[3]李永华,李思明.绝对位移直接求解的虚拟激励法[J].振动与冲击,2009,28(10):185-190.
[4]李永华,桂国庆.相对运动法与绝对位移直接求解法算法误差分析[J].土木建筑与环境工程,2011,33(5):83-89.
[5]周乾,闫维明,周宏宇.中国古建筑木结构随机地震响应分析[J].武汉理工大学学报,2010,32(9):115-118.
[6]郑毅敏,程雄涛,陈伟,等.大跨度高空弧形连廊模型风洞试验研究[J].同济大学学报:自然科学版,2007,35(9):1197-1203.
[7]李永华,李思明.多维多点激励下某多塔连体结构地震反应分析[J].土木工程学报,2011,44(4):98-104.
[8]徐文华.复杂高层多塔楼连体结构高空连廊的分析与设计[D].上海:同济大学,2007
[9]薛素铎,王雪生,曹资.基于新抗震规范的地震动随机模型参数研究[J].土木工程学报,2003,36(5):5-10.
[10]刘枫,肖从真,徐自国,等.首都机场3号航站楼多维多点输入时程地震反应分析[J].建筑结构学报,2006,27(5):56-63.
[11]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[12]SU L,DONG S,KATO S.Seismic design for steel trussed arch to multi-support excitations[J].Journal of Construc-tional Steel Research,2007,63(6):725-734.
[2]徐培福,傅学怡,王翠坤,等.复杂高层建筑结构设计[M].北京:中国建筑工业出版社,2005.
[3]李永华,李思明.绝对位移直接求解的虚拟激励法[J].振动与冲击,2009,28(10):185-190.
[4]李永华,桂国庆.相对运动法与绝对位移直接求解法算法误差分析[J].土木建筑与环境工程,2011,33(5):83-89.
[5]周乾,闫维明,周宏宇.中国古建筑木结构随机地震响应分析[J].武汉理工大学学报,2010,32(9):115-118.
[6]郑毅敏,程雄涛,陈伟,等.大跨度高空弧形连廊模型风洞试验研究[J].同济大学学报:自然科学版,2007,35(9):1197-1203.
[7]李永华,李思明.多维多点激励下某多塔连体结构地震反应分析[J].土木工程学报,2011,44(4):98-104.
[8]徐文华.复杂高层多塔楼连体结构高空连廊的分析与设计[D].上海:同济大学,2007
[9]薛素铎,王雪生,曹资.基于新抗震规范的地震动随机模型参数研究[J].土木工程学报,2003,36(5):5-10.
[10]刘枫,肖从真,徐自国,等.首都机场3号航站楼多维多点输入时程地震反应分析[J].建筑结构学报,2006,27(5):56-63.
[11]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[12]SU L,DONG S,KATO S.Seismic design for steel trussed arch to multi-support excitations[J].Journal of Construc-tional Steel Research,2007,63(6):725-734.
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