不对称大底板多塔楼隔震结构的地震响应分析
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摘要
针对不对称大底板多塔楼隔震结构体系,通过建立地震响应的动力分析简化模型,推导出不对称大底板多塔楼隔震结构体系地震作用下的运动方程。对一实际的不对称大底板多塔楼隔震结构进行地震响应仿真分析,探讨塔楼质量偏心率和塔楼质量比对结构周期比、位移比和层剪力比的影响。结果显示,不对称大底板多塔楼隔震结构扭转角主要由隔震层产生;与不隔震结构相比,不对称大底板多塔楼隔震体系的扭转角减小,可取得较好的减震效果;塔楼与底板的位置分布和质量分布会影响体系的扭转效应和减震效果,应尽量使塔楼的质心与底板质心重合,塔楼质量分布均匀,以减小结构的扭转效应,提高减震效果。
The special-type isolated building defined as asymmetric multi-tower structure with large floor is discussed in this paper.The equation of motion for this structure is derived based on the building seismic analysis model.A real multi-tower isolated building with large floor is chose as an example to show the seismic performance of this type of structure.The influences of mass eccentricity and mass ratio on the period ratio,drift ratio and shear force coefficient of the structure are discussed.The following conclusions are obtained:(1)torsional drift obviously depends on the isolated layer in the asymmetric multi-tower with large floor;(2)comparing with the fixed base structures,this special type isolated building can sharply reduce the torsional response;and(3)the effect of isolation reduce with the increase of mass eccentricity of the tower.It is concluded from the study that the multi-tower base isolated building with large floor should be symmetric and concentric for reducing structural seismic response.
The special-type isolated building defined as asymmetric multi-tower structure with large floor is discussed in this paper.The equation of motion for this structure is derived based on the building seismic analysis model.A real multi-tower isolated building with large floor is chose as an example to show the seismic performance of this type of structure.The influences of mass eccentricity and mass ratio on the period ratio,drift ratio and shear force coefficient of the structure are discussed.The following conclusions are obtained:(1)torsional drift obviously depends on the isolated layer in the asymmetric multi-tower with large floor;(2)comparing with the fixed base structures,this special type isolated building can sharply reduce the torsional response;and(3)the effect of isolation reduce with the increase of mass eccentricity of the tower.It is concluded from the study that the multi-tower base isolated building with large floor should be symmetric and concentric for reducing structural seismic response.
引文
[1]徐忠根,周福霖.底部二层框架上部多塔楼底隔震数值模拟与试验研究[J].地震工程与工程振动,2005,25(1):126-132.Xu Zh G,Zhou F L.Data imitation and test researchof tower bottom isolation of buildings with lower twostories frame and upper multi-tower[J].EarthquakeEngineering and Engineering Vibration,2005,25(1):126-132.
[2]贾洪,徐茂义,闫维明,等.某隔震结构动力特性的理论分析与脉动测试[J].震灾防御技术,2007,(4):13-18.Jia H,Xu M Y,Yan W M,et al.Micro-tremor testand theory analysis on dynamic behaviors of anisolation structures[J].Technology for EarthquakeDisaster Prevention,2007,(4):13-18.
[3]叶昆,李黎.大底盘多塔楼结构基础隔震设计分析[J].工程抗震,2001,(3):22-26.Ye K,Li L.Analysis and design of the base isolatorsfor multi-tower structure with large podium[J].Earthquake Resistant Engineering,2001,(3):22-26.
[4]Matsagar V A,Janggid R S.Seismic response ofbase-isolated structures during impact with adjacentstructures[J].Engineering Structures,2003,25(6):1311-1323.
[5]李慧,张志公,杜永峰.大底盘多塔楼结构基础隔震非线性时程分析[J].兰州理工大学学报,2007,(1):33-37.Li H,Zhang Zh G,Du Y F.Nonlinear time-historyanalysis of base-isolated building with multi-towerstructure and large podium[J].Journal of LanzhouUniversity of Technology,2007,(1):33-37.
[6]GB 50011-2001,建筑抗震设计规范[S].
[7]党育,霍凯成.偏心隔震结构扭转效应的影响因素分析[J].武汉理工大学学报,2010,32(14):23-29.Dang Y,Huo K Ch.Study on the effect of torsionalresponse of base-isolated buildings[J].Journal ofWuhan University of Technology,2010,32(14):23-29.
[8]Nagarajaiah S,Reinhorn A M,Constantinou M C.Torsion in base-isolated structures with elastomericisolation systems[J].Journal of StructuralEngineering,1993,119(10):2932-2951.
[9]Tena-Colunga A,Escamilla-Cruz J L.Torsionalamplification in asymmetric base-isolated structures[J].Engineering Structures,2007,29(2):237-247.
[10]徐培福,黄吉锋,韦承基.高层建筑结构的扭转反应控制[J].土木工程学报,2006,39(7):1-8.Xu P F,Huang J F,Wei Ch J.Control of torsionalresponse of tall building structures[J].China CivilEngineering Journal,2006,39(7):1-8.
[2]贾洪,徐茂义,闫维明,等.某隔震结构动力特性的理论分析与脉动测试[J].震灾防御技术,2007,(4):13-18.Jia H,Xu M Y,Yan W M,et al.Micro-tremor testand theory analysis on dynamic behaviors of anisolation structures[J].Technology for EarthquakeDisaster Prevention,2007,(4):13-18.
[3]叶昆,李黎.大底盘多塔楼结构基础隔震设计分析[J].工程抗震,2001,(3):22-26.Ye K,Li L.Analysis and design of the base isolatorsfor multi-tower structure with large podium[J].Earthquake Resistant Engineering,2001,(3):22-26.
[4]Matsagar V A,Janggid R S.Seismic response ofbase-isolated structures during impact with adjacentstructures[J].Engineering Structures,2003,25(6):1311-1323.
[5]李慧,张志公,杜永峰.大底盘多塔楼结构基础隔震非线性时程分析[J].兰州理工大学学报,2007,(1):33-37.Li H,Zhang Zh G,Du Y F.Nonlinear time-historyanalysis of base-isolated building with multi-towerstructure and large podium[J].Journal of LanzhouUniversity of Technology,2007,(1):33-37.
[6]GB 50011-2001,建筑抗震设计规范[S].
[7]党育,霍凯成.偏心隔震结构扭转效应的影响因素分析[J].武汉理工大学学报,2010,32(14):23-29.Dang Y,Huo K Ch.Study on the effect of torsionalresponse of base-isolated buildings[J].Journal ofWuhan University of Technology,2010,32(14):23-29.
[8]Nagarajaiah S,Reinhorn A M,Constantinou M C.Torsion in base-isolated structures with elastomericisolation systems[J].Journal of StructuralEngineering,1993,119(10):2932-2951.
[9]Tena-Colunga A,Escamilla-Cruz J L.Torsionalamplification in asymmetric base-isolated structures[J].Engineering Structures,2007,29(2):237-247.
[10]徐培福,黄吉锋,韦承基.高层建筑结构的扭转反应控制[J].土木工程学报,2006,39(7):1-8.Xu P F,Huang J F,Wei Ch J.Control of torsionalresponse of tall building structures[J].China CivilEngineering Journal,2006,39(7):1-8.
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