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【诗研】论文:基于位移的中等跨径减隔震桥梁抗震设计方法  

2016-03-07 17:36:26|  分类: 减隔震 |  标签: |举报 |字号 订阅

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摘要 为了给新建减隔震桥梁设计和既有桥梁减隔震加固设计提供参考,以中等跨径的公路桥梁为研究对象,结合中国的抗震设计规范和减隔震支座技术标准,提出一种基于位移的抗震设计方法。该设计方法给出了选择减隔震支座和估计设计目标位移的方法,从串联体系受力特点的角度提出了桥墩-支座体系的位移分配方法,设计中允许桥墩屈服,但通过控制损伤程度确保震后不需要修复,也要求进行支座的安全性检验。构造了具有不同外形特征和不同跨径的36座连续梁桥进行减隔震设计,并通过动力时程分析验证了设计方法的可行性。研究结果表明:提出的设计方法能够较好地预测主梁的位移需求,易于把握支座和桥墩的性能状态;该设计方法也适用于非规则桥梁,可通过横向位移变异系数判断主梁的横向位移变形模式。
关键词 : 桥梁工程,  减隔震桥梁,  基于位移的设计方法,  橡胶支座,  抗震加固    
Abstract:In order to provide references for design of new bridges and the retrofitting of the existing ones with isolated bearings, a displacement-based seismic design method for medium span highway bridges was developed based on seismic design code and technical standard of isolated bearings in China. The design method provided references for choosing appropriate size of isolated bearings and estimating the design target displacement, and the displacement distribution method of pier-bearing system was carried out according to mechanics characteristic of system in series. The yield of pier was allowed in the design, but no repair was needed after ground motions through the control of damage degree. Also, the design required test the safety of bearings. Taking 36 continuous beam bridges with different configurations and different span lengths for examples, the feasibility was verified through dynamic time-history analysis. The results show that the proposed method can predict displacement requirement of girder better and is easy to master the performances of bearings and piers. The method is also suitable for irregular bridges, which can judge the lateral displacement deformation mode of girder through lateral displacement variation coefficient.
Key words: bridge engineering    seismic isolated bridge    displacement-based design method    rubber bearing    seismic retrofit

引用本文:   
石岩, 王东升, 孙治国. 基于位移的中等跨径减隔震桥梁抗震设计方法[J]. 中国公路学报, 2016, 29(2): 71-81.
SHI Yan, WANG Dong-sheng, SUN Zhi-guo. Displacement-based Seismic Design Method for Medium Span Bridges with Seismic Isolation[J]. China Journal of Highway and Transport, 2016, 29(2): 71-81.

链接:http://zgglxb.chd.edu.cn/CN/abstract/abstract2189.shtml
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