考虑土-桩-结构相互作用的PHC管桩抗震性能试验研究
|
摘要
通过振动台模型试验,在考虑土-桩-结构相互作用的条件下研究PHC管桩的抗震性能。试验采用层状剪切土箱,装填黏土、粉土、砂土3种土体,分别安装单桩、三桩和六桩3个模型。对每个模型施加3种不同的地震波,5种不同的振动强度。结果表明:随着振动持续,各模型体系的自振频率降低,阻尼增大。随着震级增加,土-桩-结构间的相互作用影响加大,土体及土-桩-结构体系的非线性增强,且少桩体系的非线性性质要强于多桩体系。桩的数量和布置方式以及上部结构的变化均极大地影响着桩体应变和弯矩的大小及分布规律。三桩、六桩模型最大拉应变比单桩模型分别下降23%和66%,最大弯矩分别下降29%和70%,桩-土界面压力分别下降22%和32%。多桩体系的震动破坏程度也远弱于少桩体系。初步确定PHC管桩在高烈度地区的应用是可行的,值得进一步研究。
A shaking table model test of the earthquake performance of PHC pipe pile under seismic excitations considering soil-pile-structure interaction effect is presented.Features of the shaking table test include a variety of pile models,i.e.single pile,three piles,and six piles,and a shear soil box consisting of clay,silt,and sand layers.The various developed soil-pile-structure systems are then subjected to three sets of seismic ground motions.Each set of the earthquake events is composed of five input excitation scenarios with varying intensities.The evaluation results show that along with earthquake continues,each model system natural frequency decreases and damping increases.The earthquake intensity has a significant effect on the soil-pile-structure system.Specifically,the soil-pile-structure interaction and soil nonlinearity effects are observed to go up as the intensity increases.The nonlinearity effects of systems with fewer piles are stronger than those with more piles.Moreover,the number and arrangement pattern of the piles as well as the configuration of the upper structure can exert substantial impact on the strain and bending moment responses.It is shown that compared to the single-pile model,the maximum tensile strains of the three-pile model and six-pile model drop by 23 percent and 66 percent respectively,whereas the maximum bending moments decrease by 29 percent and 70 percent respectively.On the other hand,the soil-pile interface pressure reduces by 22 percent and 32 percent respectively.It is also found that the damage behaviors for systems with more piles are less severe than those with fewer piles.The results of this preliminary investigation further indicate the feasibility of exploiting PHC piles in high seismicity regions.Nonetheless,it is also suggested that more research efforts are required for extensive application of PHC piles in such areas.
A shaking table model test of the earthquake performance of PHC pipe pile under seismic excitations considering soil-pile-structure interaction effect is presented.Features of the shaking table test include a variety of pile models,i.e.single pile,three piles,and six piles,and a shear soil box consisting of clay,silt,and sand layers.The various developed soil-pile-structure systems are then subjected to three sets of seismic ground motions.Each set of the earthquake events is composed of five input excitation scenarios with varying intensities.The evaluation results show that along with earthquake continues,each model system natural frequency decreases and damping increases.The earthquake intensity has a significant effect on the soil-pile-structure system.Specifically,the soil-pile-structure interaction and soil nonlinearity effects are observed to go up as the intensity increases.The nonlinearity effects of systems with fewer piles are stronger than those with more piles.Moreover,the number and arrangement pattern of the piles as well as the configuration of the upper structure can exert substantial impact on the strain and bending moment responses.It is shown that compared to the single-pile model,the maximum tensile strains of the three-pile model and six-pile model drop by 23 percent and 66 percent respectively,whereas the maximum bending moments decrease by 29 percent and 70 percent respectively.On the other hand,the soil-pile interface pressure reduces by 22 percent and 32 percent respectively.It is also found that the damage behaviors for systems with more piles are less severe than those with fewer piles.The results of this preliminary investigation further indicate the feasibility of exploiting PHC piles in high seismicity regions.Nonetheless,it is also suggested that more research efforts are required for extensive application of PHC piles in such areas.
引文
[1]中华人民共和国行业标准编写组.JGJ94—2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.(The Professional StandardsCompilation Group of People s Republic of China.JGJ94—2008Technical code for building pile foundations[S].Beijing:ChinaArchitecture and Building Press,2008.(in Chinese))
[2]PRASAD S K,TOWHATA I,CHANDRADHARA G P,et al.Shaking table tests in earthquake geotechnical engineering[J].CurrentScience,2004,87(10):1 398-1 404.
[3]KUBO K.Vibration test of a structure supported by pile foundation[C]//Proceedings of the 4th World Conference on Earthquake Engineering.[S.l.]:[s.n.],1969:1-12.
[4]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,FANLichu,WANG Junjie.Shake table test on soil-pile-structure interaction[J].China Civil Engineering Journal,2002,35(4):91-97.(in Chinese))
[5]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.(LUXilin,CHEN Yueqing,CHEN Bo,et a1.Shaking table testing ofdynamic soil-structure interaction system[J].Earthquake Engineeringand Engineering Vibration,2000,20(4):20-29.(in Chinese))
[6]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.(LOUMenglin,WANG Wenjian,MA Hengchun,et al.Study on soil-pile-structureinteraction system by shaking table model test[J].Journal of TongjiUniversity,2001,29(7):763-768.(in Chinese))
[7]冯士伦,王建华,郭金童.液化土层中桩基抗震性能研究[J].岩石力学与工程学报,2005,24(8):1402-1406.(FENG Shilun,WANGJianhua,GUO Jintong.Seismic resistance of pile foundation in liquefactionlayer[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):1 402-1 406.(in Chinese))
[8]凌贤长,唐亮,于恩庆.可液化场地地震振动孔隙水压力增长研究的大型振动台试验及其数值模拟[J].岩石力学与工程学报,2006,25(增2):3 998-4 003.(LING Xianzhang,TANG Liang,YU Enqing.Large-scale shaking table test and its numericalsimulation of research on build-up behavior of seismically-inducedpore water pressure in liquefiable site[J].Chinese Journal of RockMechanics and Engineering,2006,25(Supp.2):3 998-4 003.(inChinese))
[9]武思宇,宋二祥,刘华北,等.刚性桩复合地基抗震性能的振动台试验研究[J].岩土力学,2007,28(1):77-82.(WU Siyu,SONGErxiang,LIU Huabei,et al.Shaking table test study on aseismicbehavior of rigid pile composite foundation[J].Rock and Soil Mechanics,2007,28(1):77-82.(in Chinese))
[10]CHAU K T,SHEN C Y,GOU X.Nonlinear seismic soil-pile-structureinteractions:shaking table tests and FEM analyses[J].Soil Dynamicsand Earthquake Engineering,2009,29(2):300-310.
[11]钱德玲,夏京,卢文胜,等.支盘桩-土-高层建筑结构振动台试验的研究[J].岩石力学与工程学报,2009,28(10):2024-2030.(QIAN Deling,XIA Jing,LU Wensheng,et al.Study of shaking tabletest of squeezed branch pile-soil-high-rise structure interactionsystem[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(10):2 024-2 030.(in Chinese))
[12]李培振,刘艳梅,崔胜龙,等.可液化土-高层结构振动台试验的土性参数识别[J].岩石力学与工程学报,2011,30(增1):3234-3244.(LI Peizhen,LIU Yanmei,CUI Shenglong,et al.Parameter identificationof soil properties in shaking table test on liquefiable soil-high-risebuildings system[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(Supp.1):3 234-3 244.(in Chinese))
[13]姜忻良,徐炳伟,焦莹.大型土-桩-复杂结构振动台模型试验研究[J].土木工程学报,2010,43(10):98-105.(JIANG Xinliang,XU Bingwei,JIAO Ying.Analysis of shaking table test of large-scalesoil-pile-complex structure interaction[J].China Civil EngineeringJournal,2010,43(10):98-105.(in Chinese))
[14]伍小平,孙利民,胡世德,等.振动台试验用层状剪切变形土箱的研制[J].同济大学学报,2002,30(7):781-785.(WU Xiaoping,SUN Limin,HU Shide,et al.Development of laminar shear box usedin shaking table test[J].Journal of Tongji University,2002,30(7):781-785.(in Chinese))
[15]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.(LING Xianzhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction ofpile-soil-bridge structure in ground of soil liquefaction[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(3):450-456.(in Chinese))
[2]PRASAD S K,TOWHATA I,CHANDRADHARA G P,et al.Shaking table tests in earthquake geotechnical engineering[J].CurrentScience,2004,87(10):1 398-1 404.
[3]KUBO K.Vibration test of a structure supported by pile foundation[C]//Proceedings of the 4th World Conference on Earthquake Engineering.[S.l.]:[s.n.],1969:1-12.
[4]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,FANLichu,WANG Junjie.Shake table test on soil-pile-structure interaction[J].China Civil Engineering Journal,2002,35(4):91-97.(in Chinese))
[5]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.(LUXilin,CHEN Yueqing,CHEN Bo,et a1.Shaking table testing ofdynamic soil-structure interaction system[J].Earthquake Engineeringand Engineering Vibration,2000,20(4):20-29.(in Chinese))
[6]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.(LOUMenglin,WANG Wenjian,MA Hengchun,et al.Study on soil-pile-structureinteraction system by shaking table model test[J].Journal of TongjiUniversity,2001,29(7):763-768.(in Chinese))
[7]冯士伦,王建华,郭金童.液化土层中桩基抗震性能研究[J].岩石力学与工程学报,2005,24(8):1402-1406.(FENG Shilun,WANGJianhua,GUO Jintong.Seismic resistance of pile foundation in liquefactionlayer[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):1 402-1 406.(in Chinese))
[8]凌贤长,唐亮,于恩庆.可液化场地地震振动孔隙水压力增长研究的大型振动台试验及其数值模拟[J].岩石力学与工程学报,2006,25(增2):3 998-4 003.(LING Xianzhang,TANG Liang,YU Enqing.Large-scale shaking table test and its numericalsimulation of research on build-up behavior of seismically-inducedpore water pressure in liquefiable site[J].Chinese Journal of RockMechanics and Engineering,2006,25(Supp.2):3 998-4 003.(inChinese))
[9]武思宇,宋二祥,刘华北,等.刚性桩复合地基抗震性能的振动台试验研究[J].岩土力学,2007,28(1):77-82.(WU Siyu,SONGErxiang,LIU Huabei,et al.Shaking table test study on aseismicbehavior of rigid pile composite foundation[J].Rock and Soil Mechanics,2007,28(1):77-82.(in Chinese))
[10]CHAU K T,SHEN C Y,GOU X.Nonlinear seismic soil-pile-structureinteractions:shaking table tests and FEM analyses[J].Soil Dynamicsand Earthquake Engineering,2009,29(2):300-310.
[11]钱德玲,夏京,卢文胜,等.支盘桩-土-高层建筑结构振动台试验的研究[J].岩石力学与工程学报,2009,28(10):2024-2030.(QIAN Deling,XIA Jing,LU Wensheng,et al.Study of shaking tabletest of squeezed branch pile-soil-high-rise structure interactionsystem[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(10):2 024-2 030.(in Chinese))
[12]李培振,刘艳梅,崔胜龙,等.可液化土-高层结构振动台试验的土性参数识别[J].岩石力学与工程学报,2011,30(增1):3234-3244.(LI Peizhen,LIU Yanmei,CUI Shenglong,et al.Parameter identificationof soil properties in shaking table test on liquefiable soil-high-risebuildings system[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(Supp.1):3 234-3 244.(in Chinese))
[13]姜忻良,徐炳伟,焦莹.大型土-桩-复杂结构振动台模型试验研究[J].土木工程学报,2010,43(10):98-105.(JIANG Xinliang,XU Bingwei,JIAO Ying.Analysis of shaking table test of large-scalesoil-pile-complex structure interaction[J].China Civil EngineeringJournal,2010,43(10):98-105.(in Chinese))
[14]伍小平,孙利民,胡世德,等.振动台试验用层状剪切变形土箱的研制[J].同济大学学报,2002,30(7):781-785.(WU Xiaoping,SUN Limin,HU Shide,et al.Development of laminar shear box usedin shaking table test[J].Journal of Tongji University,2002,30(7):781-785.(in Chinese))
[15]凌贤长,王臣,王成.液化场地桩-土-桥梁结构动力相互作用振动台试验模型相似设计方法[J].岩石力学与工程学报,2004,23(3):450-456.(LING Xianzhang,WANG Chen,WANG Cheng.Scale modeling method of shaking table test of dynamic interaction ofpile-soil-bridge structure in ground of soil liquefaction[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(3):450-456.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心