不同桩型-高层建筑结构体系动力相互作用的对比分析
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摘要
基于分层土-支盘桩-高层框架结构相互作用体系的振动台试验,利用有限元分析软件MARC对支盘桩及直杆桩体系进行相同条件下的建模,并与试验结果对比验证了其合理性。经过对比分析,在x-z向地震波激励下,直杆桩-高层建筑结构体系的上部结构相对于支盘桩体系的位移、变形明显增大;两种体系上部结构的应力集中区域主要在一层柱底和各层梁柱搭接处,而在柱底与承台交界处最大;在柱底,支盘桩体系的剪应力值和应变值比直杆桩体系更大,很容易造成这个部位的局部破坏。计算结果表明:桩型改变时,高层建筑结构的动力反应有着较大的差异。
Based on the shaking tables tests of layered soil-branch piles-high rise frame structure interaction system,the model of the branch piles and straight piles system was built with the MARC finite element software and its rationality was verifyed through comparision with test results.By comparison analysis,under the x-z direction earthquake wave stimulation,the displacement and deformation of the superstructure of the straight piles-tall building structure system increase more than the branch pile system.In the column-beam lapping and the first floor column base,it is distributed much stress in both branch and straight pile system.While the maximum appeared at the borderline of the column base and pile cap.In the column base,branch pile system has greater shear stress value and strain value than straight pile system and it can easily cause local damage in this position.The results show that tall building structure system dynamic response has great difference when pile type changing.
Based on the shaking tables tests of layered soil-branch piles-high rise frame structure interaction system,the model of the branch piles and straight piles system was built with the MARC finite element software and its rationality was verifyed through comparision with test results.By comparison analysis,under the x-z direction earthquake wave stimulation,the displacement and deformation of the superstructure of the straight piles-tall building structure system increase more than the branch pile system.In the column-beam lapping and the first floor column base,it is distributed much stress in both branch and straight pile system.While the maximum appeared at the borderline of the column base and pile cap.In the column base,branch pile system has greater shear stress value and strain value than straight pile system and it can easily cause local damage in this position.The results show that tall building structure system dynamic response has great difference when pile type changing.
引文
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[2]Meymand P.Shake table tests:seismic soil-pile-superstructure inter-action[J].PEER Center News,1998,1(2):1-4.
[3]Lu X L,Chen Y Q,Chen B,et al.Shaking table model test on dy-namic soil-structure interaction system[J].Journal of Asian Archi-tecture and Building Engineering,2002,1(1):55-63.
[4]楼梦麟,王文剑,马恒春,等.土-桩-结构相互作用体系的振动台模型试验[J].同济大学学报,2001,29(7):763-768.Lou Menglin,Wang Wenjian,Ma Hengchun,et al.Study on soil-pile-structure interaction system by shaking table model test[J].Journalof Tongji University,2001,29(7):763-768.
[5]吕西林,陈跃庆.高层建筑结构-地基动力相互作用效果的振动台试验对比研究[J].地震工程与工程振动,2002,22(2):43-48.LüXilin,Chen Yueqing.Study on effect of soil-structure interactionby shaking table test[J].Earthquake Engineering and Engineering Vibration,2002,22(2):43-48.
[6]吕西林,陈跃庆,陈波,等.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20-29.LüXilin,Chen Yueqing,Chen Bo,et al.Shaking table testing of dy-namic soil-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):20-29.
[7]陈火红.Marc有限元实例分析教程[M].北京:机械工业出版社,2002.
[8]阚前华,常志华.MSC.Marc工程实例分析与二次开发[M].北京:中国水利水电出版社,2005.
[9]梁清香.有限元与Marc实现[M].北京:机械工业出版社,2005.
[10]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[11]赵跃平,钱德玲,吴进.采用MARC模拟支盘桩-地基-结构动力相互作用体系建模方法[J].合肥工业大学学报(自然科学版),2007,30(8):1 028-1 032.Zhao Yueping,Qian Deling,Wu Jin.Modeling of the squeezedbranch pile-soil-structure dynamic interaction system by the MARCprogram[J].Journal of Hefei University of Technology(NaturalScience),2007,30(8):1 028-1 032.
[12]钱德玲,宋传中,王东坡,等.地基-结构动力相互作用体系中数值仿真的研究[J].岩石力学与工程学报,2008,27(S1):2 953-2 959.Qian Deling,Song Chuanzhong,Wang Dongpo,et al.Study on nu-merical simulation for dynamic interaction of soil and structure[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(S1):2 953-2 959.
[13]陈跃庆,吕西林,黄炜.结构-地基相互作用振动台试验中土体边界条件的模拟方法[J].结构工程师,2000(3):25-30.Chen Yueqing,LüXilin,Huang Wei.Simulation method of soilboundary condition in shaking table tests of soil-structure interac-tion[J].Structural Engineers,2000(3):25-30.
[14]陈波,吕西林,李培振,等.用ANSYS模拟结构-地基相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126-131.Chen Bo,LüXilin,Li Peizhen,et al.Modeling of dynamic soil-structure interaction by ANSYS program[J].Earthquake Engineer-ing and Engineering Vibration,2002,22(1):126-131.
[15]GB 50011-2001(2008年版),建筑抗震设计规范[S].
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