结构-桩-土振动台试验桩土地震反应规律分析
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摘要
该文以天津站交通枢纽工程为背景,开展了结构-桩-土相互作用振动台模型试验,在此基础上,对桩土地震反应规律进行分析。分析表明:地震波向上传播过程中,小震对加速度起放大效果,大震放大系数明显减小;桩放大系数小于土体放大系数,桩的存在对放大系数有减小的影响;桩应变呈中间大两端小的趋势;随震级增加,桩身最大位移与桩土接触压力增大,且位移随桩高度呈增大趋势,与桩端相比,桩中间部位接触压力增加最快。
A shaking table model test of structure-pile-soil interactions is accomplished on the transport hub of Tianjin station.The seismic response regulation of pile-soil is analyzed during the test.The analysis shows that in the process of wave spreading upward,a slight quake has an amplification effect to the peak acceleration,while the amplification coefficient reduces obviously in a big quake;meanwhile,the pile amplification coefficient is smaller than that of soil body,the existence of piles reduce the amplification coefficient;the strain of the pile in the middle part is larger than that of the two tips.With the seismic magnitude increasing,both the pile maximum displacement and the pile-soil contact pressure increase,the deformation becomes bigger as the pile's height increases,and the contact pressure of the middle part increases significantly comparing with that of the two ends of the pile.
A shaking table model test of structure-pile-soil interactions is accomplished on the transport hub of Tianjin station.The seismic response regulation of pile-soil is analyzed during the test.The analysis shows that in the process of wave spreading upward,a slight quake has an amplification effect to the peak acceleration,while the amplification coefficient reduces obviously in a big quake;meanwhile,the pile amplification coefficient is smaller than that of soil body,the existence of piles reduce the amplification coefficient;the strain of the pile in the middle part is larger than that of the two tips.With the seismic magnitude increasing,both the pile maximum displacement and the pile-soil contact pressure increase,the deformation becomes bigger as the pile's height increases,and the contact pressure of the middle part increases significantly comparing with that of the two ends of the pile.
引文
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[6]陈跃庆,吕西林,李培振.不同土性的地基-结构动力相互作用振动台模型试验对比研究[J].土木工程学报,2006,39(5):57―64.Chen Yueqing,Lu Xilin,Li Peizhen.Comparative study on the dynamic soil-structure interaction system with various soils by using shaking table model tests[J].China Civil Engineering Journal,2006,39(5):57―64.(in Chinese)
[7]武思宇,宋二祥,刘华北.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,Song Erxiang,Liu Huabei.Shaking table test study on seismic behavior of rigid pile composite foundation[J].Rock and Soil Mechanics,2007,28(1):77―82.(in Chinese)
[8]姜忻良,徐炳伟.复杂结构-桩-土振动台模型试验数据分析[J].地震工程与工程震动,2009,29(6):65―70.Jiang Xinliang,Xu Bingwei.Data analysis of Shaking table test studying complex structure-pile-soil interaction[J].Earthquake Engineering and Engineering Vibration,2009,29(6):65―70.(in Chinese)
[9]尚守平,刘方成,卢华喜.振动台试验模型地基土的设计与试验研究[J].地震工程与工程震动,2006,26(4):199―204.Shang Shouping,Liu Fangcheng,Lu Huaxi.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)
[10]朱伯龙,张琨联.建筑结构抗震设计原理[M].上海:同济大学出版社,1994.Zhu Bolong,Zhang Kunlian.Principles of anti-quake architectural structure design[M].Shanghai:Tongji University Press,1994.(in Chinese)
[11]陈国兴,王志华,宰金珉.土与结构动力相互作用体系振动台模型试验研究[J].世界地震工程,2002,18(4):47―54.Chen Guoxing,Wang Zhihua,Zai Jinmin.Shaking table model test of soil-structure dynamic interaction system[J].World Earthquake Engineering,2002,18(4):47―54.(in Chinese)
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