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中文摘要：
针对城市曲线匝道桥的结构特点，以某一实际工程为背景，采用m法分析了承台侧向土刚度的不同取值对低桩承台基础等效平动及转动刚度的影响。应用线性及非线性时程反应分析方法研究了承台侧向土刚度对结构弹性、弹塑性地震反应以及抗震性能的影响。结果表明：承台侧向土刚度对曲线匝道桥桩基础的切向平动及转动刚度影响较大；随着承台侧向土刚度的增加，桥墩的地震反应逐渐增大，但桩身的地震反应逐渐减小；承台侧向回填土的密实程度对城市曲线匝道桥下部结构塑性铰的产生机制影响较大。
英文摘要：
In view of the structural characteristics of urban curved ramp bridges and taken a real bridge engineering as project background, the influence of different stiffnesses of lateral soil beside pile caps on equivalent translational and rotational stiffnesses for low pile cap foundation was analyzed by using m-method. By adopting linear and nonlinear time history analysis, the effects of stiffness of lateral soil beside pile caps on structural elasticity, elasto-plastie seismic response and aseismatic performance were researched. The results show that （ 1 ） the influence of stiffness of lateral soil beside pile caps on tangential translational and rotational stiffnesses of pile foundations of urban curved ramp bridges is significant ; （2） with the increase of stiffness of lateral soil beside pile caps, the seismic response of piers increases gradually, while the seismic response of pile shaft decreases gradually ; （3） the effect of the compactness of backfill beside pile caps on the formation mechanism of plastic hinge in the substructure of urban curved ramp bridges is significant.
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