相互作用体系中桩基的动力响应
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摘要
率先在国内开展了对一种新型变截面桩-土-高层建筑结构体系动力相互作用的试验研究。通过振动台模型试验,观察了桩-土-结构体系动力相互作用的现象,验证和掌握了新型桩体与结构的震害特点。根据试验测定的数据,研究了支盘桩-高层建筑结构体系的动力特性和地震反应,重点分析了支盘桩的动力响应。通过计算和分析得出:桩-土接触压力时程曲线揭示了在地震动激励下桩-土之间存在着拉开和再接触的现象,表明支盘桩在动力相互作用过程中承受了拉、拔荷载,说明和证实了当基础具有较大的抗拉、抗拔和抗扭曲能力时,才能更好的发挥动力相互作用体系的抗震性能和减轻震灾;桩基两侧对应测点的应变时程曲线呈反向关系,表明在地震作用下,相同时间内桩基一侧受拔,另一侧受压,解释了地震区房屋产生倾斜、倾倒震害现象的根本原因。
An experimental research on dynamic interaction of pile-soil-structure system was first developed in China.Phenomena of the dynamic interaction of the system were observed,so earthquake damage characteristics between a new type of pile and structure were verified and discovered by shaking table test.Dynamic characteristics and seismic response of the system were studied,and dynamic response of squeezed branch piles was analyzed based on the test data.It was shown by calculation and analysis that the separating and reclosing phenomena occurred between pile and soil under the action of the seismic exciting force,not only revealing that squeezed branch piles were pulled up and pressed down in the course of dynamic interaction,but also explaining and verifing that seismic capability and reduced earthquake damage would be obtained in the dynamic interaction system only when the foundations had greater pulling,pressing and twisting resistant capability.Phenomena of pulling up on one side and pressing down on the other side in the pile foundation were revealed according to reverse direction relation of time-course curve from the corresponding measure points on the sides of pile foundation under seismic action at the same time,and it explained essential reason why the buildings were inclined and toppled in the seismic region.
An experimental research on dynamic interaction of pile-soil-structure system was first developed in China.Phenomena of the dynamic interaction of the system were observed,so earthquake damage characteristics between a new type of pile and structure were verified and discovered by shaking table test.Dynamic characteristics and seismic response of the system were studied,and dynamic response of squeezed branch piles was analyzed based on the test data.It was shown by calculation and analysis that the separating and reclosing phenomena occurred between pile and soil under the action of the seismic exciting force,not only revealing that squeezed branch piles were pulled up and pressed down in the course of dynamic interaction,but also explaining and verifing that seismic capability and reduced earthquake damage would be obtained in the dynamic interaction system only when the foundations had greater pulling,pressing and twisting resistant capability.Phenomena of pulling up on one side and pressing down on the other side in the pile foundation were revealed according to reverse direction relation of time-course curve from the corresponding measure points on the sides of pile foundation under seismic action at the same time,and it explained essential reason why the buildings were inclined and toppled in the seismic region.
引文
[1]韦晓,范立础,王君杰.考虑桩-土-桥梁结构相互作用振动台试验研究[J].土木工程学报,2002,35(4):91-97.(WEI Xiao,FAN Li-chu,WANG Jun-jie.Shaking table test on soil-pile-structure interaction[J].China Civil Engineering Journal,2002,35(4):91-97.)
[2]GOHL W,FINN W.Seismic response of single pile in shake table studies[C]//Proceedings of5th Canadian Conference on Earthquake Engineering.Ottawa,1987:435-444
[3]JUN T,NOBUO F,SHIGEHARU Y.Experimental evaluation of dynamic characteristics of low and medium-rise buildings with soil-structure interaction[C]//The12th World Conference on Earthquake Engineering.Auckland:New Zealand,2000:2244.
[4]王伟,王俭.桩箱基础与地基相互作用高层建筑抗震性能研究[J].世界地震工程,2001,17(4):128-134.(WANG Wei,WANG Jian,Study on seismic property of tall buildings with interaction between piled-box foundation and soil ground[J].World Information on Erthquake Engineering,2001,17(4):128-134)
[5]SABINS G M,HARRIS H G.Structural modeling and experimental techniques[M].New Jersey:Prentice Hall,1983:141-167.
[6]陈波,吕西林,李培振,陈跃庆.均匀土-桩基-结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(3):91-99.(CHEN bo,LüXi-lin,LI Pei-zhen,CHEN Yue-qing.Computational analysis of dynamic homogeneous soil-pile-structure interaction[J].Earthquake Engineering and Engineering Vibration,2002,22(3):91-99.)
[7]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的研究[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.)
[8].DON H,et al.Dynamic response of single pile and soil-pile interaction[J].Canadian Geotech J,1996,33:80-96.
[9]陈跃庆,吕西林,李培振,陈波,胡质理.分层土-基础-高层框架结构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,2001,21(3):104-113.(CHEN Yue-qing,LüXi-lin,LI Pei-zhen,et al.Shaking table test for layered soil-foundation-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2001,21(3):104-113.)
[2]GOHL W,FINN W.Seismic response of single pile in shake table studies[C]//Proceedings of5th Canadian Conference on Earthquake Engineering.Ottawa,1987:435-444
[3]JUN T,NOBUO F,SHIGEHARU Y.Experimental evaluation of dynamic characteristics of low and medium-rise buildings with soil-structure interaction[C]//The12th World Conference on Earthquake Engineering.Auckland:New Zealand,2000:2244.
[4]王伟,王俭.桩箱基础与地基相互作用高层建筑抗震性能研究[J].世界地震工程,2001,17(4):128-134.(WANG Wei,WANG Jian,Study on seismic property of tall buildings with interaction between piled-box foundation and soil ground[J].World Information on Erthquake Engineering,2001,17(4):128-134)
[5]SABINS G M,HARRIS H G.Structural modeling and experimental techniques[M].New Jersey:Prentice Hall,1983:141-167.
[6]陈波,吕西林,李培振,陈跃庆.均匀土-桩基-结构相互作用体系的计算分析[J].地震工程与工程振动,2002,22(3):91-99.(CHEN bo,LüXi-lin,LI Pei-zhen,CHEN Yue-qing.Computational analysis of dynamic homogeneous soil-pile-structure interaction[J].Earthquake Engineering and Engineering Vibration,2002,22(3):91-99.)
[7]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的研究[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.)
[8].DON H,et al.Dynamic response of single pile and soil-pile interaction[J].Canadian Geotech J,1996,33:80-96.
[9]陈跃庆,吕西林,李培振,陈波,胡质理.分层土-基础-高层框架结构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,2001,21(3):104-113.(CHEN Yue-qing,LüXi-lin,LI Pei-zhen,et al.Shaking table test for layered soil-foundation-structure interaction system[J].Earthquake Engineering and Engineering Vibration,2001,21(3):104-113.)
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