竖向动压力对FPS隔震连续梁桥地震响应影响研究

发布时间：2018-04-03 17:21

本文选题：摩擦摆支座　切入点：隔震桥梁　出处：《应用基础与工程科学学报》2017年04期

【摘要】：摩擦摆支座因其稳定的力学特性而广泛应用于中小跨径的桥梁隔震.文中首先根据FPS力学模型的特点,剥离出摩擦力项并给出了考虑动压力对回复力中摩擦力项影响的有限元实现,以较准确模拟FPS的力学特性.以单自由度模型为例,研究了动压力和摩擦限值对其动力响应的影响.其次以四跨连续梁桥为例,建立2种不同FPS支座布置参数的平面动力分析有限元模型,研究了同时考虑竖向和水平地震作用时,结构时域动力响应特点.文中研究表明:考虑动压力影响后,FPS支座的滞回环不再是标准的平行四边形,呈现出一定的波动性;采用FPS隔震连续梁桥在考虑动压力对摩擦力项影响后,可避免墩底反力高估.
[Abstract]:Friction pendulum bearings are widely used in the isolation of bridges with medium and small span due to their stable mechanical properties.In this paper, according to the characteristics of FPS mechanical model, the friction term is stripped out and the finite element method considering the effect of dynamic pressure on the friction term is given to simulate the mechanical characteristics of FPS accurately.The effect of dynamic pressure and friction limit on the dynamic response of single degree of freedom model is studied.Secondly, taking the four-span continuous beam bridge as an example, the finite element model of plane dynamic analysis of two different FPS bearing layout parameters is established, and the time-domain dynamic response characteristics of the structure considering both vertical and horizontal earthquakes are studied.The reaction force at the bottom of the pier can be avoided overestimating.
【作者单位】：上海建工(集团)总公司;东南大学土木工程学院;北京建筑大学土木与交通工程学院;
【基金】：国家自然科学基金项目(51408355)
【分类号】：U442.55

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