钢筋混凝土连续刚构-简支梁组合桥地震碰撞振动台阵试验

发布时间：2018-06-18 05:17

本文选题：连续刚构—简支梁组合桥 + 振动台阵试验　；参考：《地震工程与工程振动》2014年02期

【摘要】：震害表明,邻梁之间发生碰撞是引发桥梁局部破坏甚至落梁的主要原因,研究桥梁地震碰撞机理对提高桥梁整体抗震性能具有重要意义。本文对一座1:10比例的、由三跨连续刚构桥与一跨简支梁桥组合的钢筋混凝土连续刚构—简支梁组合桥模型进行了多子台振动台阵试验,详细分析了该组合桥的地震碰撞响应,并进行了不同地震激励,不同减隔震方式的碰撞响应对比分析,从而为桥梁地震碰撞行为和减隔震装置的精细化模拟提供了试验依据。研究表明,行波效应以及邻梁之间刚度和质量的差异是地震时桥梁发生碰撞的主要诱因;隔震支座降低了桥梁地震碰撞的危害,但其隔震效果与地震动频谱特性密切相关;考虑行波效应,铅芯橡胶支座对桥梁碰撞相对位移和撞击力的抑制效果优于板式橡胶支座,但其对桥梁加速度响应的控制不一定优于板式橡胶支座;不同地震动减震效果存在差异,说明黏滞阻尼器的控制效果与地震动频率分布密切相关。
[Abstract]:The earthquake damage shows that the collision between adjacent beams is the main cause of the local damage and even the fall of the bridge beam. It is very important to study the seismic collision mechanism of the bridge to improve the overall seismic performance of the bridge. In this paper, a multi-stage vibration array test of a reinforced concrete continuous rigid-simply supported beam composite bridge model with a 1:10 scale, composed of a three-span continuous rigid frame bridge and a single span simply supported beam bridge is carried out, and the seismic impact response of the composite bridge is analyzed in detail. The impact responses of different seismic excitation and isolation methods are compared and analyzed, which provides the experimental basis for the detailed simulation of bridge seismic impact behavior and isolation device. The results show that the traveling wave effect and the difference of stiffness and mass between adjacent beams are the main inducements of bridge collision, the isolation support reduces the damage of bridge earthquake collision, but its isolation effect is closely related to the frequency spectrum characteristics of ground motion. Considering the traveling wave effect, the effect of the lead rubber bearing on the relative displacement and impact force of the bridge is superior to that of the plate rubber bearing, but the control of the acceleration response of the bridge is not necessarily better than that of the plate rubber bearing. The results show that the control effect of viscous damper is closely related to the frequency distribution of ground motion.
【作者单位】：天津大学滨海土木工程结构与安全教育部重点实验室;北京工业大学城市与工程安全减灾省部共建教育部重点实验室;
【基金】：国家重点基础研究发展“973”计划项目(2011CB013603) 国家自然科学基金项目(91315301)
【分类号】：U442.55;U446.1

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