多维地震下双塔楼结构框架梁行波效应分析
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摘要
考虑水平向和竖向地震波的行波效应,对北京LG大厦进行了时程分析,给出了该结构典型梁的内力信息并与在一致激励下的地震反应进行比较分析,探讨了这些梁截面的地震内力在地震行波作用下的变化规律。在进一步分析结构静力反应的基础上,分别得出结构在一致地震和行波地震作用下的抗震设计内力值,考察它们之间的差异,分析了不同的地震激励方式对结构抗震设计的影响,得出了一些有工程实践意义的结论。
Taking the traveling wave effect into consideration,the time-history analysis of Beijing LG Building under horizontal and vertical excitations are studied,and internal forces of the frame beams are compared with results under a uniform excitation.And then the changing rules of the internal forces of those frame beams under the action effect of seismic traveling wave are discussed.On the basis of further analysis of static response of the structure,seismic design values of internal forces are obtained respectively under a uniform excitation and a traveling wave excitation,and the influence of the different types of seismic excitations on the seismic design value of the structure is carried out by comparing the difference of the seismic design values obtained from two types of seismic excitations.Some conclusions for engineering practice are drawn.
Taking the traveling wave effect into consideration,the time-history analysis of Beijing LG Building under horizontal and vertical excitations are studied,and internal forces of the frame beams are compared with results under a uniform excitation.And then the changing rules of the internal forces of those frame beams under the action effect of seismic traveling wave are discussed.On the basis of further analysis of static response of the structure,seismic design values of internal forces are obtained respectively under a uniform excitation and a traveling wave excitation,and the influence of the different types of seismic excitations on the seismic design value of the structure is carried out by comparing the difference of the seismic design values obtained from two types of seismic excitations.Some conclusions for engineering practice are drawn.
引文
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[2]楼梦麟,张喜.行波效应对双塔楼结构抗震设计的影响[J].结构工程师,2011,6(3):67―74.Lou Menglin,Zhang Xi.The impact of travelling waveexcitation on seismic design of twin-towers structures[J].Structural Engineers,2011,6(3):67―74.(in Chinese)
[3]楼梦麟,邸龙.地震行波激励下单层柱面网壳反应分析[J].结构工程师,2005,21(5):48―52.Lou Menglin,Di Long.Response analysis of single layercylindrical reticulated shell under seismic wave-passageexcitations[J].Structural Engineers,2005,21(5):48―52.(in Chinese)
[4]Clough R W,Pensien J.Dynamics of structures[M].New York:McMraw-hill,1993.
[5]Cheng F Y.Matrix analysis of structural dynamics[M].New York:Marcel Dekker,Inc.,2001.
[6]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.Wang Xinmin.ANSYS numerical analysis ofengineering structure[M].Beijing:ChinaCommunication Press,2007.(in Chinese)
[7]楼梦麟,张静.大跨度拱桥地震反应分析中阻尼模型的讨论[J].动与冲击,2009,28(5):22―26.Lou Menglin,Zhang Jing.Discussion of the dampingmodel on seismic response analysis of long-span archbridge[J].Journal of Vibration and Shock,2009,28(5):22―26.(in Chinese)
[8]张宝胜,布占宇,徐爱敏.斜拉桥地震响应分析中比例阻尼参考振型的选取[J].中国公路学报,2008,21(6):76―82.Zhang Baosheng,Bu Zhanyu,Xu Aimin.Referencevibration shape selection of proportional damping inseismic response analysis of cable-stayed bridge[J].China Journal of Highway and Transport,2008,21(6):76―82.(in Chinese)
[9]GB50011-2010,建筑抗震设计规范[M].北京:中国建筑工业出版社,2010.GB 50011-2010,Code for seismic design of buildings[M].Beijing:China Construction Press,2010.(inChinese)
[10]石树中,沈建文,楼梦麟.基岩场地强地面运动加速度反应谱统计特征[J].同济大学学报(自然科学版),2002,30(11):1300―1304.Shi Shuzhong,Shen Jianwen,Lou Menglin.Statisticfeatures of response spectra of acceleration strong groundmotion at rock sites[J].Journal of Tongji University(Natural Science),2002,30(11):1300―1304.(in Chinese)
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