变截面桩基础体系高层建筑结构的地震响应
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摘要
基于振动台模型试验,采用大型软件MARC进行了数值仿真试验,再现了在地震作用下桩基–结构相互作用体系的动力响应。研究结果表明:基础类型变化对高层建筑结构产生的变形影响较大,桩基–结构相互作用体系中上部结构的最大层间剪力和倾覆力矩等都比刚性地基上结构体系的要小,桩基–结构体系中相当一部分地震能量通过支盘扩散到土层中,减小了上部结构的变形能。而刚性地基上结构体系中相当一部分的地震能量则转化为上部结构的变形能,导致结构损伤较大。同时,振动台试验和数值仿真结果表明:支盘桩结构体系的阻尼能较大,能够有效地提高基础和结构体系的抗震和减震能力,降低上部结构在地震作用下的地震响应,对抵御地震、减少地震破坏具有十分重要的意义。
Dynamic response of pile foundation-structure interaction is reproduced under earthquakes in the shaking table model tests and numerical simulation tests using software MARC.The results show that the effect of deformation of high-rise structures is large because of changed pile-type.The most shear force and overturning moment of high-rise structure in squeezed branch pile interaction system are smaller than those in straight pile interaction system.The deformation energy of the structure is reduced on account of considerable seismic energy in the interaction system of squeezed branch piles and is diffused to the soil through the branch or disk,while considerable seismic energy in the interaction system of straight piles and is converted into deformation energy of the structure,resulting in greater structural damage.At the same time,the results of shaking table tests and numerical simulation show that the squeezed branch pile-foundation has more damping energy,effectively enhances seismic capability of the structure system,and reduces seismic response of the structure under earthquakes.The study is of great significance to the reduction of earthquake damage.
Dynamic response of pile foundation-structure interaction is reproduced under earthquakes in the shaking table model tests and numerical simulation tests using software MARC.The results show that the effect of deformation of high-rise structures is large because of changed pile-type.The most shear force and overturning moment of high-rise structure in squeezed branch pile interaction system are smaller than those in straight pile interaction system.The deformation energy of the structure is reduced on account of considerable seismic energy in the interaction system of squeezed branch piles and is diffused to the soil through the branch or disk,while considerable seismic energy in the interaction system of straight piles and is converted into deformation energy of the structure,resulting in greater structural damage.At the same time,the results of shaking table tests and numerical simulation show that the squeezed branch pile-foundation has more damping energy,effectively enhances seismic capability of the structure system,and reduces seismic response of the structure under earthquakes.The study is of great significance to the reduction of earthquake damage.
引文
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[9]宋二祥,武思宇,王宗纲.地基一结构系统振动台模型试验中相似比的实现问题探讨[J].土木工程学报,2008,41(10):87–92.(SONG Er-xiang WU Si-yu,WANG Zong-gang.A tentative solution for similitude realization in shaking table tests of SSI systems[J].China Civil Engineering Journal,2008,41(10):87–92.(in Chinese))
[10]钱德玲,赵元一,王东坡.桩-土-结构体系动力相互作用的试验研究[J].上海交通大学学报,2005,39(11):1856–1861.(QIAN De-ling,ZHAO Yuan-yi,WANG Dong-po.Experimental study on the dynamic interaction of squeezed branch pile–soil–structure system by shaking table test[J].Journal of Shanghai Jiaotong University,2005,39(11):1856–1861(in Chinese))
[11]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):42–48.(LüXi-lin,CHEN Yue-qing.Study on effect of soil-structure interaction by shaking table test[J].Earthquake Engineering and Engineering Vibration,2002,22(2):42–48.(in Chinese))
[2]李培振,陈跃庆,吕西林,等.较硬分层土–桩基–结构相互作用体系振动台试验[J].同济大学学报,2006,34(3):307–313.(LI Pei-zhen,CHEN Yun-qing,LüXi-lin,et al.Shaking table testing of hard layered soil-pile-structure interaction system[J].Journal of Tongji University,2006,34(3):307–313.(in Chinese))
[3]LU X L,CHEN Y Q,CHEN B,et al.Shaking table model test on dynamic soil-structure interaction system[J].Journal of Asian Architecture and Building Engineering,2002,1(1):55–63.
[4]史晓军,岳庆霞,李杰.土–结构动力相互作用振动台试验中模型地基影响因素分析[J].建筑科学与工程学报,2007,24(4):50–53.(SHI Xiao-jun,YUE Qing-xia,LI Jie.Influence factor analysis of foundation model in shaking table test considering soil-structure dynamic interaction[J].Journal of Architecture and Civil Engineering,2007,24(4):50–53.(in Chinese))
[5]LUCO J Enrique.A simple model for structural control including soil-structure interaction effects[J].Earthquake Engineering and Structural Dynamics,1998,27(3):225–242.
[6]MEYMAND P.Shake table tests:seismic soil pile superstructure interaction[J].PEER Center News,1998,l(2):1–4.
[7]吕西林,陈跃庆.结构–地基相互作用体系的动力相似关系的研究[J].地震工程与工程振动,2001,21(9):85–92.(LüXi-lin,CHEN Yue-qing.Study on dynamic similitude theory of soil-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2001,21(9):85–92.(in Chinese))
[8]杨树标,杜广辉,李荣华,等.结构动力模型相似关系研究及验证[J].河北工程大学学报,2008,25(3):4–7.(YANG Shu-biao,DU Guang-hui,LI Rong-hua.Research of similitude laws for dynamic structural model test[J].Journal of Hebei University of Engineering(Natural Science Edition),2008,25(3):4–7.(in Chinese))
[9]宋二祥,武思宇,王宗纲.地基一结构系统振动台模型试验中相似比的实现问题探讨[J].土木工程学报,2008,41(10):87–92.(SONG Er-xiang WU Si-yu,WANG Zong-gang.A tentative solution for similitude realization in shaking table tests of SSI systems[J].China Civil Engineering Journal,2008,41(10):87–92.(in Chinese))
[10]钱德玲,赵元一,王东坡.桩-土-结构体系动力相互作用的试验研究[J].上海交通大学学报,2005,39(11):1856–1861.(QIAN De-ling,ZHAO Yuan-yi,WANG Dong-po.Experimental study on the dynamic interaction of squeezed branch pile–soil–structure system by shaking table test[J].Journal of Shanghai Jiaotong University,2005,39(11):1856–1861(in Chinese))
[11]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):42–48.(LüXi-lin,CHEN Yue-qing.Study on effect of soil-structure interaction by shaking table test[J].Earthquake Engineering and Engineering Vibration,2002,22(2):42–48.(in Chinese))
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