挡块对连续梁桥横向地震响应的影响对比研究

发布时间：2019-06-20 00:49

【摘要】：为了研究挡块对桥梁横向地震响应的影响,选取了3座墩高配置不同的连续梁桥,建立了考虑桥台-背土相互作用、支座摩擦效应和挡块力学本构的非线性分析模型,采用时程法对比了在无挡块、弹性挡块、X型钢挡块和钢筋混凝土挡块工况下3座桥梁地震响应的变化。研究表明:限位能力越强的挡块对下部结构地震响应的影响越不利,钢筋混凝土挡块因易发生强度和刚度退化,影响相对最小;挡块会使不等墩高连续梁桥原本均匀分配的惯性力重新集中于矮墩,造成矮墩设计困难;当地震动较小时,采用钢筋混凝土挡块一方面具有较好的限位能力,另一方面对下部结构地震响应的影响也最小,但当地震动较大时,钢筋混凝土挡块几乎不起作用,钢挡块可发挥更好的限位作用。
[Abstract]:In order to study the influence of retaining block on lateral seismic response of bridge, three continuous beam bridges with different pier height are selected, and a nonlinear analysis model considering platform-backsoil interaction, bearing friction effect and mechanical constitution of retaining block is established. The seismic responses of three bridges under the condition of unblocked block, elastic retaining block, X-shaped steel block and reinforced concrete block are compared by using time equation method. The results show that the stronger the limit capacity is, the more unfavorable the influence of the retaining block on the seismic response of the lower structure is, and the reinforced concrete retaining block is prone to strength and stiffness degradation, and the influence is relatively minimal. The blocking block will reconcentrate the inertia force of the unequal pier height continuous beam bridge on the low pier, resulting in the design difficulty of the low pier. When the local vibration is small, the reinforced concrete block has better limit ability on the one hand, and has the least influence on the seismic response of the lower structure on the other hand, but when the local vibration is large, the reinforced concrete block hardly plays a role, and the steel block can play a better role in limiting the position.
【作者单位】：重庆交通大学土木工程学院;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：国家自然科学基金(51408089) 重庆市基础与前沿研究计划(cstc2015jcyj A30014)
【分类号】：U442.55

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