结构-桩-土振动台试验桩土地震反应规律分析  

REGULATION ANALYSIS OF PILE-SOIL SEISMIC RESPONSE BASED ON STRUCTURE-PILE-SOIL SHAKING TABLE TEST

作　　者：吴薪柳[1] 姜忻良[1] 

机构地区：[1]天津大学建工学院,天津300072

出　　处：《工程力学》2011年第A01期201-204,210,共5页Engineering Mechanics

基　　金：国家自然科学基金重大研究计划项目(90815025);国家自然科学基金项目(50878143);天津市应用基础及前沿技术研究计划项目(09JCZDJC25300)

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.

关 键 词：振动台试验 桩土相互作用 放大系数 桩身位移 接触压力 

分 类 号：TU317.1[建筑科学—结构工程]