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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。
Aiming at the structural characteristics of the city curve ramp bridge, using m as an example, the influence of different values of lateral soil stiffness on the equivalent translational and rotational stiffness of the pile cap foundation is analyzed. The effects of lateral soil stiffness on the structural elasticity, elasto-plastic seismic response and seismic performance are studied by linear and nonlinear time-history analysis methods. The results show that the lateral soil stiffness of the cap has a great influence on the tangential translational and rotational stiffness of the ramp ramp pile foundation. With the increase of lateral soil stiffness, the seismic response of the bridge piers increases gradually. However, And the reaction gradually decreased. The density of lateral backfill of cap was greatly affected by the plastic hinges in the lower part of the city curve ramp bridge.