拉索摩擦摆支座在曲线梁桥中的抗震分析

发布时间：2018-01-19 13:02

本文关键词： 曲线梁桥拉索摩擦摆支座弯扭耦合能力需求比减震率　出处：《地震工程与工程振动》2014年03期 　论文类型：期刊论文

【摘要】：针对曲线梁桥弯扭耦合严重、地震危害明显等特点,提出一种更适于曲线梁桥的减隔震支座-拉索摩擦摆支座。以一座实际城市曲线梁桥为背景,建立曲线梁桥在4种支座下的三维模型,真实模拟了支座处于双向滑动极限工作状态的性能,重点讨论拉索摩擦摆支座在曲线梁桥上的减隔震效果;引入减震率概念,对比了4种模型在5种参数下差异。结果表明:此支座能够有效降低曲线梁桥中墩、边墩内力,减小弯扭耦合作用,将墩、梁相对位移限制在设计范围内,且具有较好的能力需求比。通过调整拉索的自由程或摩擦摆的摩擦系数可以得到最优减隔震效果。
[Abstract]:In view of the serious coupling between bending and torsion of curved girder bridge and the obvious seismic hazard, a kind of anti-vibration isolation-cable friction pendulum bearing is proposed, which is more suitable for curved girder bridge. The background is a practical curved girder bridge in the city. The 3D model of curved girder bridge under four kinds of supports is established, and the performance of bearing in the state of bi-directional sliding limit is simulated, and the isolation effect of cable friction pendulum bearing on curved girder bridge is discussed. This paper introduces the concept of damping rate and compares the differences of four models under five parameters. The results show that the bearing can effectively reduce the internal force of side pier and the coupling effect of bending and torsion in curved girder bridge. The relative displacement of the beam is limited within the design range and has a better ratio of capacity to demand. By adjusting the free path of the cable or the friction coefficient of the friction pendulum, the optimum isolation effect can be obtained.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51278376,90915011) 同济大学土木工程学院光华基金项目
【分类号】：U442.55
【正文快照】： 引言据统计,截至2012年底,国内约有38条轨道交通线路修建高架桥,而在目前各主要城市交通线网中,高架桥占了30%,在建的各大城市交通线网中,高架桥占了50%左右[1]。由于地形、道路线形以及使用功能的要求,曲线梁桥成为大、中城市快速交通网格的主要桥型。但曲线梁桥由于其自身线

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