复杂结构-桩-土体系下的桩-土动力p-y曲线
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摘要
以天津站交通枢纽工程为背景,开展了复杂结构–桩–土相互作用振动台模型试验,研究了桩土相互作用的动力特性。运用弹性地基梁理论,得出弯矩时程和土压力,采用实测桩的加速度值积分求得桩的位移,得到桩–土动力p–y曲线,求出了不同深度及不同时间段阻尼与弹簧刚度系数分布规律。研究表明:受底部筏板的影响,阻尼与土弹簧刚度沿桩身分布可近似考虑成分段线性,分段点约在桩身上部1/3范围处。阻尼与弹簧刚度均随埋深的增加而增大;随着地震动的持续,阻尼基本稳定,只在桩底略有增大;弹簧刚度随振动时间持续有所降低,且随埋深增大,其降低的幅度越大。
Shaking table tests on complex structure-pile-soil interaction are accomplished for the transport junction of Tianjin Station,and dynamic properties of pile-soil interaction are studied.The time history of moment and soil pressure are obtained from the theory of elastic foundation and the displacement of pile is acquired through integral of pile acceleration measured from the tests,and then dynamic p-y curves of pile-soil are obtained.The distribution rules of damping and spring stiffness coefficient at different depths during different periods are calculated.It is shown that the distribution of damping and spring stiffness coefficient along the pile can approximately be taken as piecewise linearization,and the turning point is at about 1/3 length of the pile from the top.Both the damping and the spring stiffness coefficient increase with the increase of pile depth;and with the continuous vibration,damping is stable along the pile except slight increase at the bottom of the pile while the spring stiffness coefficient decreases continuously,and the decrease magnitude is expanded as the depth increases.
Shaking table tests on complex structure-pile-soil interaction are accomplished for the transport junction of Tianjin Station,and dynamic properties of pile-soil interaction are studied.The time history of moment and soil pressure are obtained from the theory of elastic foundation and the displacement of pile is acquired through integral of pile acceleration measured from the tests,and then dynamic p-y curves of pile-soil are obtained.The distribution rules of damping and spring stiffness coefficient at different depths during different periods are calculated.It is shown that the distribution of damping and spring stiffness coefficient along the pile can approximately be taken as piecewise linearization,and the turning point is at about 1/3 length of the pile from the top.Both the damping and the spring stiffness coefficient increase with the increase of pile depth;and with the continuous vibration,damping is stable along the pile except slight increase at the bottom of the pile while the spring stiffness coefficient decreases continuously,and the decrease magnitude is expanded as the depth increases.
引文
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[15]NOVAK M.Dynamic stiffness and damping of piles[J].Can Geotech J,1974,11(4):574-598.
[2]WILSON D W,BOULANGER R W,KUTTER B L.Observed seismic lateral resistance of liquefying sand[J].J Geotech Geoenviron Eng,2000,126(10):898-906.
[3]ROVITHIS E,KIRTAS E,PITILAKIS K.Experimental p-y loops for estimating seismic soil-pile interaction[J].Bulletin of Earthquake Engineering,2009,7(3):719-736.
[4]冯士伦,王建华,郭金童.液化土层中桩基抗震性能振动台试验研究[J].土木工程学报,2005,38(7):92-95.(FENG Shi-lun,WANG Jian-hua,GUO Jin-tong.A shake table test on the seismic resistance of pile foundation in liquefied soil[J].China Civil Engineering Journal,2005,38(7):92-95.(in Chinese))
[5]李雨润,袁晓铭,梁艳,等.桩-液化土相互作用p-y关系分析[J].地震工程与工程振动,2008,28(3):155-171.(LI Yu-run,YUAN Xiao-ming,LIANG Yan,et al.Analysis for p-y curves of liquefied soil-pile interaction[J].Earthquake Engineering and Engineering Vibration,2008,28(3):155-171.(in Chinese))
[6]姜忻良,徐炳伟.复杂结构-桩-土振动台模型试验数据分析[J].地震工程与工程振动,2009,29(6):65-70.(JIANG Xin-liang,XU Bing-wei.Data analysis of shaking table test studying complex structure-pile-soil interaction[J].Earthquake Engineering and Engineering Vibration,2009,29(6):65-7.(in Chinese))
[7]楼梦麟,王文剑,朱彤,等.土-结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-36.(LOU Meng-lin,WANG Wen-jian,ZHU Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):30-36.(in Chinese))
[8]姜忻良,徐炳伟,李竹.土-桩-结构振动台模型试验相似理论及其实施[J].振动工程学报,2010,23(2):225-229.(JIANG Xin-liang,XU Bing-wei,LI Zhu.Similitude laws and its application in shaking table test of soil-pile-structure interaction system[J].Journal of Vibration Engineering,2010,23(2):225-229.(in Chinese))
[9]姜忻良,徐炳伟.大型复杂结构-桩-土振动台模型试验土箱设计[J].天津大学学报,2010,43(10):912-918.(JIANG Xin-liang,XU Bing-wei.Soil chamber design of shaking table test for large-scale soil-pile-complex structure interaction[J].Journal of Tianjin University,2010,43(10):912-918.(in Chinese))
[10]尚守平,刘方成,卢华喜,等.振动台试验模型地基土的设计与试验研究[J].地震工程与工程振动,2006,26(4):199-204.(SHANG Shou-ping,LIU Fang-cheng,LU Hua-xi,et al.Design and experimental study of a model soil used for shaking table test[J].Earthquake Engineering and Engineering Vibration,2006,26(4):199-204.(in Chinese))
[11]沈德建,吕西林.模型试验的微粒混凝土力学性能试验研究[J].土木工程学报,2010,43(10):14-21.(SHEN De-jian,LU??Xi-lin.Experimental study on the mechanical property of microconcrete in model test[J].China Civil Engineering Journal,2010,43(10):14-21.(in Chinese))
[12]杨政,廖红建,楼康禺.微粒混凝土受压应力应变全曲线试验研究[J].工程力学,2002,19(2):90-94.(YANG Zheng,LIAO Hong-jian,LOU Kang-yu.Experimental study of the full curve of the stress-strain relationship for microconcrete[J].Engineering Mechanics,2002,19(2):90-94.(in Chinese))
[13]TING J M.Full-scale cyclic dynamic lateral pile response[J].J Geotech Eng,1987,113(1):30-45.
[14]王建华,戚春香,余正春.弱化饱和砂土中桩的p-y曲线与极限抗力研究[J].岩土工程学报,2008,30(3):309-315.(WANG Jian-hua,QI Chun-xiang,YU Zheng-chun.p-y curves and lateral resistances of piles in saturated degradation sand[J].Chinese Journal of Geotechnical Engineering,2008,30(3):309-315.(in Chinese))
[15]NOVAK M.Dynamic stiffness and damping of piles[J].Can Geotech J,1974,11(4):574-598.
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