土-结构相互作用对LRB减震桥梁影响的分析

An Analysis of Effect of Soil-Structure Interaction upon Bridge of Seismic Reduction with LRB

探讨了地震作用下桩基础刚度对采用铅销橡胶支座 (L RB)桥梁减震效果的影响 ,提出以墩底弹簧约束模型模拟群桩基础的方法 ,建立了考虑地基刚度影响的桥梁非线性动力分析模型。算例的非线性时程分析结果表明 :结构设计中如采用刚性基础假设 ,即忽略土 -结构相互作用 ,对普通橡胶支座 (RB)和铅销橡胶支座 (L RB)都会使设计结果偏于安全 ,尤其对 L

This paper discusses the effect of the pile foundation stiffness under the earthquake excitation upon the bridge of seismic reduction with Lead Rubber Bearing(LRB). Suggests the method of pier foot spring constraint model simulating group piles foundation and establishes the nonlinear dynamic analysis model of bridge based on the base stiffness influence. The nonlinear time history analysis results of calculating examples show: In the structural design, the designed results on Rubber Bearing (RB) and LRB would be safe with adopting the hypothesis of rigid foundation, i.e. the soil structure interaction is ignored, and especially the results on LRB would be much safer in richness.