多维多点激励下某多塔连体结构地震反应分析
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摘要
杭州市市民中心工程是一高位隔震大跨度多塔连体结构,6个主塔楼在高位采用隔震支座与6个大跨度钢结构连廊连接成一整体,整个连体结构外环周长达606m,故有必要进行多维多点输入地震反应分析。采用谐波叠加方法和快速傅里叶变换技术,合成了与建筑抗震设计规范(GB 50011—2001)反应谱相吻合的空间相关地震波,同时提出采用相关函数对人工模拟地震波在时域内进行检验的方法。利用模拟地震波对该工程进行多维、多点激励下的非线性时程分析,结果表明:在双向地震动作用下,考虑多点激励会使连廊杆件轴力、连廊与主塔楼间的隔震支座位移有较大增加,其中行波效应影响尤为明显,但多点激励对主塔楼内力和位移影响很小。
Hangzhou Citizen Center is a circular multi-tower connected structure with an outer circumference of 606m,and six high-rise towers are connected with large-span steel truss corridors by isolators at high positions.Spatially variable ground motions corresponding with the design response spectrum of national seismic design code(GB 50011—2001) are generated by using harmonic wave superimposing method and fast Fourier transform technique,and a method using correlation function to check the simulated seismic wave is presented.The nonlinear seismic responses of the structure under multi-support excitations of bilateral horizontal orthogonal seismic actions are numerically simulated by time history analysis.The results show that the axial forces of the steel truss bars and isolation bearing displacements increase,the wave passage effects are especially prominent,however,the displacements and internal forces of the towers vary only slightly,under multi-support excitations.
Hangzhou Citizen Center is a circular multi-tower connected structure with an outer circumference of 606m,and six high-rise towers are connected with large-span steel truss corridors by isolators at high positions.Spatially variable ground motions corresponding with the design response spectrum of national seismic design code(GB 50011—2001) are generated by using harmonic wave superimposing method and fast Fourier transform technique,and a method using correlation function to check the simulated seismic wave is presented.The nonlinear seismic responses of the structure under multi-support excitations of bilateral horizontal orthogonal seismic actions are numerically simulated by time history analysis.The results show that the axial forces of the steel truss bars and isolation bearing displacements increase,the wave passage effects are especially prominent,however,the displacements and internal forces of the towers vary only slightly,under multi-support excitations.
引文
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[2]施卫星,孙黄胜,李振刚,等.上海国际赛车场新闻中心高位隔震研究[J].同济大学学报:自然科学版,2005,33(12):1576-1580(Shi Weixing,Sun Huangsheng,LiZhengang,et al.High-position seismic isolation of presscenter at Shanghai international circuit[J].Journal ofTongji University:Natural Science Edition,2005,33(12):1576-1580(in Chinese))
[3]Ates S,Bayraktar A,Dumanoglu A A.The effect ofspatially varying earthquake ground motions on thestochastic response of bridges isolated with frictionpendulum systems[J].Soil Dynamics and EarthquakeEngineering,2006,26(1):31-44
[4]Liang Su,Shi Lindong,Shiro K.A new average responsespectrum method for linear response analysis of a structureto spatial earthquake ground motions[J].EngineeringStructures,2006,28(13):1835-1842
[5]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(Zheng Yimin,Cheng Xiongtao,ChenWei,et al.Wind tunnel test study on wind loadcharacteristics for long span steel arc skybridge model[J].Journal of Tongji University:Natural Science Edition,2007,35(9):1197-1203(in Chinese))
[6]George D.Simulation of ergodic multivariate stochasticprocesses[J].Journal of Engineering Mechanics,1996,122(8):778-787
[7]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(Xue Suduo,Wang Xuesheng,Cao Zi.Parameters studyon seismic random model based on the new seismic code[J].China Civil Engineering Journal,2003,36(5):5-10(in Chinese))
[8]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62
[9]Su Liang,Dong Shilin,Shiro K.Seismic design for steeltrussed arch to multi-support excitations[J].Journal ofConstructional Steel Research,2007,63(6):725-734
[10]全伟,李宏男,岳茂光.多点激励下输电塔-导线体系纵向地震反应分析[J].振动与冲击,2008,27(10):75-79(Quan Wei,Li Hongnan,Yue Maoguang.Longitudinalresponse of a power transmission tower-cable system undermulti-support excitations[J].Journal of Vibration andShock,2008,27(10):75-79(in Chinese))
[11]刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003(Liu Xianming.Study on response spectrum theory of long-span spatiallattice structures under multi-support and multi-dimensionalearthquake excitations[D].Nanjing:Southeast University,2003(in Chinese))
[12]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
[13]GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001(GB 50011—2001 Code for seismicdesign of buildings[S].Beijing:China Architecture&Building Press,2001(in Chinese))
[14]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(Liu Feng,Xiao Congzhen,Xu Ziguo,et al.Time-history analysis of terminal 3 of the Capital Airportunder multi-support and multi-dimension seismic excitation[J].Journal of Building Structures,2006,27(5):56-63(in Chinese))
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