考虑支座滑移及挡块破坏的中小跨径梁桥地震易损性研究

宋帅; 王帅; 吴刚

doi:10.11899/zzfy20190409

考虑支座滑移及挡块破坏的中小跨径梁桥地震易损性研究

doi: 10.11899/zzfy20190409

宋帅^1,,
王帅¹,
吴刚²

1.
太原理工大学, 土木工程学院, 太原 030024
2.
华东交通大学, 土木建筑学院, 南昌 330013

基金项目:

国家自然科学基金资助项目 51808376

中国博士后科学基金资助项目 2019M651076

山西省高等学校科技创新资助项目 20192L0276

江西省青年科学基金资助项目 20192BAB216032

详细信息

作者简介:
宋帅, 男, 生于1987年。博士后, 讲师。研究方向为桥梁抗震。E-mail:songshuai@tyut.edu.cn

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- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2019-03-27
- 刊出日期: 2019-12-01

Seismic Vulnerability Analysis of Small and Medium Span Girder Bridges Considering the Sliding of Bearing and Shear Key Damage

1.
College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China
2.
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China

摘要

摘要: 从板式橡胶支座及混凝土挡块抗震设计角度，以一座典型的3跨预应力混凝土连续梁桥为例，结合概率地震需求分析及桥墩、支座等抗震关键构件极限破坏状态，建立不同支座及挡块分析模型的中小跨径梁桥地震易损性曲线，研究考虑支座滑移效应及挡块破坏的中小跨径梁桥的易损性特征。研究结果表明：不考虑橡胶支座的滑移效应及混凝土挡块破坏，桥墩地震破坏概率明显增大，且会低估支座破坏概率；桥梁系统易损性受支座破坏状态的影响显著，需设置合理的限位装置；在中小跨径梁桥地震易损性分析中，考虑支座的滑移效应及混凝土挡块的破坏十分必要。
- 桥梁工程 /
- 地震易损性 /
- 支座滑移效应 /
- 挡块破坏 /
- 有限元分析
Abstract: From the perspective of seismic designs of plate type elastomeric pad bearings and concrete shear key,a typical three-span prestressed concrete continuous girder bridge was taken as a case study. Combined with the probabilistic seismic demand analysis and the limit failure states of critical members such as piers and bearings,this study developed the vulnerability curves of the bridges with different models of bearings and shear keys and studies the Vulnerability characteristics of the small and medium-span bridge considering the slip effect of the bearing and the shear key damage. The results show that the seismic damage probability of the pier is obviously increased without considering the slip effect of bearings and the shear key damage,and the probability of the bearing damage is underestimated; the system vulnerability is significantly affected by the damage of bearings,and a reasonable limit device is needed for the bearing; the sliding effect of bearings and shear key damages should be considered in the seismic vulnerability analysis of small and medium span girder bridges.
- Bridge engineering /
- Seismic vulnerability /
- Sliding effect of bearing /
- Shear key damage /
- Finite element analysis

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图 1 桥梁地震易损性分析流程

Figure 1. Flow chart of bridge seismic vulnerability analysis

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图 2 桥梁有限元模型

Figure 2. Finite element model of the bridge

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图 3 地震动加速度反应谱

Figure 3. Acceleration spectrum of ground motions

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图 4 构件概率地震需求

Figure 4. Seismic demands of bridge components

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图 5 支座易损性曲线对比

Figure 5. Comparison of seismic vulnerability curves of bearings

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图 6 桥墩易损性曲线对比

Figure 6. Comparison of seismic vulnerability curves of piers

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图 7 桥梁系统易损性曲线对比

Figure 7. Comparison of seismic vulnerability curves of bridge system

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表 1 梁桥不确定参数及其概率分布

Table 1. Uncertainty parameters and distribution types of girder bridges

参数	分布类型	均值	变异系数
钢筋屈服强度/MPa	对数正态分布	381.65	0.074
混凝土抗压强度/MPa	正态分布	28.03	0.172
滑动支座摩擦系数	正态分布	0.06	0.5
支座剪切模量/MPa	正态分布	1.18	0.14
阻尼比	正态分布	0.05	0.2
上部结构质量/（kg·m³）	正态分布	2600	0.1

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表 2 构件极限破坏状态及其限值

Table 2. Damage states and limit values of components

破坏状态	桥墩曲率延性比$\mu {}_\varphi $	支座水平位移u/mm
轻微破坏	1≤$\mu {}_\varphi $ < 1.41	76≤u < 114
中等破坏	1.41≤$\mu {}_\varphi $ < 5.28	114≤u < 152
严重破坏	5.28≤$\mu {}_\varphi $ < 8.28	152≤u < 190
完全破坏	8.28≤$\mu {}_\varphi $	190≤u

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