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中文摘要：
为研究强震下桩基础桥梁的非线性地震反应滞回规律，综合考虑桩侧土水平向仅受压非线性与竖向的摩擦作用以及桩尖土的非线性压入与提离作用，提出了桩基础桥梁的非线性地震反应分析模型，并通过单墩桩基础桥梁模型的拟静力加载试验验证了改进模型的合理性。以某客运专线跨度为32m的双线简支梁重力式桥墩为背景，根据不同构件的非线性建立了4种模型，利用非线性时程反应分析方法对4种模型进行分析。结果表明，承台底剪力-水平位移、承台底弯矩-转角呈纺锤状滞回规律，地基土的仅受压非线性特性对地震反应结果影响较大，建议桩基础桥梁在进行非线性地震反应分析时考虑地基土的影响。
英文摘要：
To study the hysteretic law of the nonlinear seismic response of the bridge with pile foundations in the strong earthquake event, an improved analytical model for the nonlinear seismic response of the bridge was put forward, comprehensively considering the horizontal compressive nonlinear action and vertical frictional action of the soil surrounding the piles as well as the nonlinear compressive action and lifting action of the soil at the pile tips, and the validity of the analytical model was verified through the quasi-static loading tests made for the model of the bridge with a single pier supported on the pile foundation. The 32-m span double-track simply- supported girder bridge with gravity piers on a passenger dedicated railway was taken as an exam- pie, 4 types of the models were established according to the nonlinearities of different components and the models were analyzed, using the analytical method of the nonlinear time-history re- sponse. The results of the analysis demonstrate that the shear forces~ horizontal displacement and the bending moment~ rotating angles of the pile cap bottom present the hysteretic law of spindle shape. The compressive nonlinear characteristic of the foundation soil has remarkable influence on the seismic response and it is therefore proposed that the influence of the foundation soil should be considered when the nonlinear seismic response analysis of the bridge with pile foundations is carried out.
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