大跨门式钢管桁架结构多点输入地震响应分析
|
摘要
地震动空间效应导致结构不同支座处的地震激励不一致,大跨结构应进行多点输入地震响应分析.本文对一大跨门式钢管桁架结构进行多点输入时程分析计算,考察该类型结构分别受水平和竖向地震多点输入行波效应作用下的弹性响应特征.计算结果表明,多点输入地震动激发门式结构的水平对称振型和竖向反对称振型,是导致结构多点输入地震响应与一致输入产生差别的重要原因;地震波波速对结果影响较大,为保证结果的可靠性,应取有效范围内的多个视波速进行计算;上部结构和下部结构相比,刚度小的部位结构响应受多点输入影响大;水平多点输入桁架梁中部构件、竖向多点输入桁架梁端部构件内力变化极大.
Viewing the inconsistency of earthquake ground motions of structural bases for large span structures,it is necessary to take the multi-support excitation into account.A typical large span Gate-type Tube Truss is taken as an example to investigate the seismic response properties of the structure form under horizontal and vertical multi-support excitation considering the wave-passage effect via time-history method.The results show that(1) the difference between multi-support and uniform excitation is primarily attributed to the different excited modes,which are horizontal symmetric modes under horizontal earthquake while vertical antisymmetric modes under vertical earthquake;(2) more wave velocities are proposed to be employed to obtain reliable results since they have a strong influence on the seismic response;(3) for the upper and lower parts of the structure,the parts with smaller stiffness are more sensitive to the multi-support excitation;(4) under horizontal multi-support excitations,the internal forces of elements near the centre of truss beam differed greatly from the counterpart under uniform excitation,and so did the elements near the end of truss beam under vertical multi-support excitations.
Viewing the inconsistency of earthquake ground motions of structural bases for large span structures,it is necessary to take the multi-support excitation into account.A typical large span Gate-type Tube Truss is taken as an example to investigate the seismic response properties of the structure form under horizontal and vertical multi-support excitation considering the wave-passage effect via time-history method.The results show that(1) the difference between multi-support and uniform excitation is primarily attributed to the different excited modes,which are horizontal symmetric modes under horizontal earthquake while vertical antisymmetric modes under vertical earthquake;(2) more wave velocities are proposed to be employed to obtain reliable results since they have a strong influence on the seismic response;(3) for the upper and lower parts of the structure,the parts with smaller stiffness are more sensitive to the multi-support excitation;(4) under horizontal multi-support excitations,the internal forces of elements near the centre of truss beam differed greatly from the counterpart under uniform excitation,and so did the elements near the end of truss beam under vertical multi-support excitations.
引文
[1]SU Liang,DONG Shilin,Shiro Kato.Seismic Design for SteelTrussed Arch to Multi-Support Excitations[J].Journal ofConstructional Steel Research,2007,63(6):725-734.
[2]JIANG Yang,SHI Yongjiu,WANG Yuanqing.SeismicResponse Analysis of Long-Span Structures Under Multi-ple Excitations[C]∥Beijing:IASS-APCS,2006.
[3]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:工学版,2005,39(1):39-45.LUO Yaozhi,WANG Rong.Study on Dynamic Charac-teristics and Behavior of Cable Dome Subjected to Multi-Dimensional and Multi-Point Seismic Excitations[J].Journal of Zhejiang University:Engineering Science,2005,39(1):39-45.(in Chinese)
[4]胡聿贤.地震工程学[M].北京:地震出版社,2006.HU Yuxian.Earthquake Engineering[M].Beijing:Earthquake Press,2006.(in Chinese)
[5]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.LIN Jiahao,ZHANG Yahui.Pseudo-Excitation Methodfor Random Vibration[M].Beijing:Science Press,2004.(in Chinese)
[6]Kiureghian A D,Neuenhofer A.Response SpectrumMethod for Multi-Support Seismic Excitations[J].Earthquake Engineering&Structural Dynamics,1992,21(8):713-740.
[7]孙建梅,叶继红,程文氵襄.多点输入反应谱方法的简化[J].东南大学学报:自然科学版,2003,33(5):647-651.SUN Jianmei,YE Jihong,CHENG Wenrang.Simplifica-tion of the Multi-Support Response Spectrum Method[J].Journal of Southeast University:Natural Science Edi-tion,2003,33(5):647-651.(in Chinese)
[8]Kiureghian A D.A Coherency Modal for Spatially VaryingGround Motions[J].Earthquake Engineering&Struc-tural Dynamics,1996,25(1):99-111.
[9]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,2005,31(3):350-360.LIN Jiahao,ZHANG Yahui,ZHAO Yan.Seismic Analy-sis Methods of Long-Span Structures and Recent Ad-vances[J].Advances in Mechanics,2005,31(3):350-360.(in Chinese)
[10]梁嘉庆.大跨空间结构在非一致地震输入下的弹性响应分析[D].南京:东南大学,2004.LIANG Jiaqing.Study on Elastic Vibration of SpaceStructures under Non-Uniform Excitations[D].Nanjing:Southeast University,2004.(in Chinese)
[2]JIANG Yang,SHI Yongjiu,WANG Yuanqing.SeismicResponse Analysis of Long-Span Structures Under Multi-ple Excitations[C]∥Beijing:IASS-APCS,2006.
[3]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:工学版,2005,39(1):39-45.LUO Yaozhi,WANG Rong.Study on Dynamic Charac-teristics and Behavior of Cable Dome Subjected to Multi-Dimensional and Multi-Point Seismic Excitations[J].Journal of Zhejiang University:Engineering Science,2005,39(1):39-45.(in Chinese)
[4]胡聿贤.地震工程学[M].北京:地震出版社,2006.HU Yuxian.Earthquake Engineering[M].Beijing:Earthquake Press,2006.(in Chinese)
[5]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.LIN Jiahao,ZHANG Yahui.Pseudo-Excitation Methodfor Random Vibration[M].Beijing:Science Press,2004.(in Chinese)
[6]Kiureghian A D,Neuenhofer A.Response SpectrumMethod for Multi-Support Seismic Excitations[J].Earthquake Engineering&Structural Dynamics,1992,21(8):713-740.
[7]孙建梅,叶继红,程文氵襄.多点输入反应谱方法的简化[J].东南大学学报:自然科学版,2003,33(5):647-651.SUN Jianmei,YE Jihong,CHENG Wenrang.Simplifica-tion of the Multi-Support Response Spectrum Method[J].Journal of Southeast University:Natural Science Edi-tion,2003,33(5):647-651.(in Chinese)
[8]Kiureghian A D.A Coherency Modal for Spatially VaryingGround Motions[J].Earthquake Engineering&Struc-tural Dynamics,1996,25(1):99-111.
[9]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,2005,31(3):350-360.LIN Jiahao,ZHANG Yahui,ZHAO Yan.Seismic Analy-sis Methods of Long-Span Structures and Recent Ad-vances[J].Advances in Mechanics,2005,31(3):350-360.(in Chinese)
[10]梁嘉庆.大跨空间结构在非一致地震输入下的弹性响应分析[D].南京:东南大学,2004.LIANG Jiaqing.Study on Elastic Vibration of SpaceStructures under Non-Uniform Excitations[D].Nanjing:Southeast University,2004.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心