地震下考虑群体效应的高层建筑土-结构相互作用研究
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摘要
基于有限元软件ANSYS,对相邻高层结构的动力相互作用进行三维有限元计算模拟分析,探讨建筑群在地震作用下的动力反应规律。分析模型中,地基土体采用上海软土,土体的本构模型采用等效线性模型,土体的侧向边界为黏弹性人工边界,上部结构采用框架剪力墙结构。将结构-土-结构动力相互作用(Structure-Soil-Structure Interaction,简称SSSI)体系与对应的单个结构-土动力相互作用(Structure-Soil Interaction,简称SSI)体系的分析进行比较,证实SSSI与SSI体系建筑物动力特性和地震反应差别。结果表明,与SSI体系相比,考虑SSSI效应时,体系自振频率降低,土体的加速度峰值有所减小,且减小幅度随着土层厚度增加迅速下降;上部结构的峰值位移减小,且减小幅度随着楼层的增高而增大;结构总层间剪力和倾覆力矩减小,且框架部分承担的力矩比例减小。
The finite element analysis software ANSYS was adopted to establish the model of dynamic interaction of adjacent high-rise buildings. In this model, the soil parameters were based on the characteristics of Shanghai soft soil. Equivalent linearity model was chosen as the constitutive relation of soil and the viscous-spring boundary of soil was applied. The buildings were the frame-shear-wall structures. Through comparing the simulation results of structure-soil-structure interaction(SSSI) of the adjacent high-rise buildings and structure-soil interaction(SSI) of single high-rise building,it was confirmed that the difference of dynamic characteristics and seismic behavior between SSSI effect and SSI effect. The results show that considering SSSI effect the natural frequency of the system and the peak acceleration peak value of soil are reduced, and the amplitude attenuation decreases with the soil depth; Meanwhile, the peak displacement of upper structure is reduced, and the amplitude attenuation increases with the altitude of the structure. In addition, the total interstory shear force and overturning moment of the upper structure is reduced, and the moment transferred to frame decreases.
The finite element analysis software ANSYS was adopted to establish the model of dynamic interaction of adjacent high-rise buildings. In this model, the soil parameters were based on the characteristics of Shanghai soft soil. Equivalent linearity model was chosen as the constitutive relation of soil and the viscous-spring boundary of soil was applied. The buildings were the frame-shear-wall structures. Through comparing the simulation results of structure-soil-structure interaction(SSSI) of the adjacent high-rise buildings and structure-soil interaction(SSI) of single high-rise building,it was confirmed that the difference of dynamic characteristics and seismic behavior between SSSI effect and SSI effect. The results show that considering SSSI effect the natural frequency of the system and the peak acceleration peak value of soil are reduced, and the amplitude attenuation decreases with the soil depth; Meanwhile, the peak displacement of upper structure is reduced, and the amplitude attenuation increases with the altitude of the structure. In addition, the total interstory shear force and overturning moment of the upper structure is reduced, and the moment transferred to frame decreases.
引文
[1]DGJ08-11—1999地基基础设计规范[S].上海,1999(DGJ08-11—1999 Foundation design code[S].Shangha,1999(in Chinese))
[2]刘学山.考虑接触问题的黏弹性介质中盾构隧道的抗震分析[D].上海:同济大学,2000(Liu Xueshan.Seismic analysis of shield tunnel in viscoelastic media considering contact problems[D].Shanghai:Tongji University,2000(in Chinese))
[3]黄雨,陈竹昌,周红波.上海软土的动力计算模型[J].同济大学学报,2000,28(3):359-363(Huang Yu,Chen Zhuchang,Zhou Hongbo.Dynamic calculation model of Shanghai soft soil[J].Journal of Tongji University,2000,28(3):359-363(in Chinese))
[4]Deeks A J,Randolph M F.Axisymmetric time-domain transmitting boundaries[J].Journal of Engineering Mechanics,1994,120(1):25-42
[5]李培振.结构-地基动力相互作用体系的振动台试验及计算模拟分析[D].上海:同济大学,2002(Li Peizhen.Shaking table testsing and computer analysis of dynamic soil-structure interaction system[D].Shanghai:Tongji University,2002(in Chinese))
[6]Padrón L A,Aznárez J J,Maeso O.Dynamic structure–soil–structure interaction between nearby piled buildings under seismic excitation by BEM–FEM model[J].Soil dynamics and earthquake engineering,2009,29(6):1084-1096
[2]刘学山.考虑接触问题的黏弹性介质中盾构隧道的抗震分析[D].上海:同济大学,2000(Liu Xueshan.Seismic analysis of shield tunnel in viscoelastic media considering contact problems[D].Shanghai:Tongji University,2000(in Chinese))
[3]黄雨,陈竹昌,周红波.上海软土的动力计算模型[J].同济大学学报,2000,28(3):359-363(Huang Yu,Chen Zhuchang,Zhou Hongbo.Dynamic calculation model of Shanghai soft soil[J].Journal of Tongji University,2000,28(3):359-363(in Chinese))
[4]Deeks A J,Randolph M F.Axisymmetric time-domain transmitting boundaries[J].Journal of Engineering Mechanics,1994,120(1):25-42
[5]李培振.结构-地基动力相互作用体系的振动台试验及计算模拟分析[D].上海:同济大学,2002(Li Peizhen.Shaking table testsing and computer analysis of dynamic soil-structure interaction system[D].Shanghai:Tongji University,2002(in Chinese))
[6]Padrón L A,Aznárez J J,Maeso O.Dynamic structure–soil–structure interaction between nearby piled buildings under seismic excitation by BEM–FEM model[J].Soil dynamics and earthquake engineering,2009,29(6):1084-1096
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