大跨度桥梁边墩横向减震体系的地震易损性分析

发布时间：2018-01-21 06:46

本文关键词： 桥梁边墩横向减震体系滞回型钢阻尼器地震易损性分析损伤指标　出处：《同济大学学报(自然科学版)》2016年03期 　论文类型：期刊论文

【摘要】：在大跨度桥梁中,边墩的竖向恒载与中墩相比往往较小,导致支座滑动摩擦力较小,因此,摩擦型耗能减震支座无法有效控制地震位移.针对以上问题,提出了滞回型钢阻尼器和滑动支座配合使用的桥梁边墩减震体系.然后,以一座大跨度钢桁架拱桥为例,建立了全桥有限元模型,以支座位移、墩底弯矩以及拱脚立柱的应力为工程需求参数,采用云图法建立概率地震需求模型,分析了该大跨度桥梁的边墩横向地震易损性.结果表明,采用滞回型钢阻尼器和滑动支座的桥梁边墩减震体系可有效降低桥梁上、下部结构各主要控制部位的横向地震易损性.
[Abstract]:In the long-span bridge, the vertical dead load of the side pier is usually smaller than that of the middle pier, which leads to the small sliding friction force of the bearing. Therefore, the friction type energy dissipation support can not effectively control the earthquake displacement. The vibration absorption system of side pier of bridge with hysteretic steel damper and sliding support is put forward. Then, taking a large span steel truss arch bridge as an example, the finite element model of the whole bridge is established, and the displacement of the bridge is taken as the base. The bending moment at the bottom of the pier and the stress of the column with arch foot are the engineering demand parameters. The probabilistic seismic demand model is established by using the cloud diagram method, and the lateral seismic vulnerability of the side pier of the long-span bridge is analyzed. Using hysteretic steel dampers and sliding supports can effectively reduce the lateral seismic vulnerability of the bridge and the main control parts of the substructure.
【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“九七三”重点基础研究发展规划(2013CB036302) 国家自然科学基金(51278375)
【分类号】：U442.55
【正文快照】： hysteretic damper;fragility analysis;damage indices对于大跨度桥梁的边墩,目前工程界常用的横向抗震体系主要有两类:(1)采用固定支座的全限位体系,限制墩、梁横向相对位移,虽然可以保障正常使用中边墩的横向稳定性,但在潜在地震下,支座和下部结构都将承受巨大的水平力,可

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