王克海, 李冲, 李茜, 李悦. 考虑支座摩擦滑移的中小跨径桥梁抗震设计方法[J]. 工程力学, 2014, 31(6): 85-92. DOI: 10.6052/j.issn.1000-4750.2012.12.0939
引用本文: 王克海, 李冲, 李茜, 李悦. 考虑支座摩擦滑移的中小跨径桥梁抗震设计方法[J]. 工程力学, 2014, 31(6): 85-92. DOI: 10.6052/j.issn.1000-4750.2012.12.0939
WANG Ke-hai, LI Chong, LI Qian, LI Yue. SEISMIC DESIGN METHOD OF SMALL AND MEDIUM SPAN BRIDGE CONSIDERING BEARING FRICTION SLIPPING[J]. Engineering Mechanics, 2014, 31(6): 85-92. DOI: 10.6052/j.issn.1000-4750.2012.12.0939
Citation: WANG Ke-hai, LI Chong, LI Qian, LI Yue. SEISMIC DESIGN METHOD OF SMALL AND MEDIUM SPAN BRIDGE CONSIDERING BEARING FRICTION SLIPPING[J]. Engineering Mechanics, 2014, 31(6): 85-92. DOI: 10.6052/j.issn.1000-4750.2012.12.0939

考虑支座摩擦滑移的中小跨径桥梁抗震设计方法

SEISMIC DESIGN METHOD OF SMALL AND MEDIUM SPAN BRIDGE CONSIDERING BEARING FRICTION SLIPPING

  • 摘要: 通过对比中国、美国、日本中小跨径桥梁结构体系, 分析中国汶川地震和美国北岭地震、日本阪神地震中桥梁震害的差异以及中国汶川地震中桥墩破坏率较低的原因, 发现美国加州桥梁结构形式主要是框架式桥墩, 日本桥梁采用钢支座为主的支承体系, 而中国中小跨径桥梁主要采用板式橡胶支座, 中国公路桥梁抗震设计中直接引用国外抗震规范存在问题;结合板式橡胶支座与铅芯橡胶支座、高阻尼橡胶支座和摩擦摆支座地震作用下耗能特点的不同, 提出中国广泛采用板式橡胶支座的中小跨径桥梁, 在抗震设计时支座可作为保险丝式单元优先损坏;参考美日两国的桥梁抗震设计方法, 给出了中国中小跨径桥梁考虑支座摩擦滑移的抗震设计方法, 建议中国中小跨径桥梁地震作用下利用板式橡胶支座摩擦耗能的特点, 通过支座摩擦滑移、最小支承长度和防落梁装置, 实现桥梁多道设防、分级耗能的抗震性能设计方法;最后给出了地震作用下桥梁纵桥向和横桥向相应的性能破坏模式, 并探讨了需要进一步研究的问题.

     

    Abstract: By the comparison of bridge structural systems among China, American and Japan, the difference of bridge damages in China Wenchuan, American Northridge and Japan Kobe earthquakes as well as the reason of the lower damage rate of piers in Wenchuan earthquake were analyzed, and it was found that the type of the pier style in California was a frame type bridge pier, the supporting system in Japan was steel bearing, while laminated plate rubber bearing was used widely in medium and small span bridges in China, then put forward the problem of citing foreign aseismic codes directly to bridge seismic design of China. Combined with the difference on aseismic performance of laminated rubber bearing, lead rubber bearing, high damping rubber bearing and friction pendulum bearing, it is suggested that bearing should be used as a fuse element in the aseismic design; Referred to the design methods of American and Japan, the aseismic design method of small and medium span bridges considering bearing friction slipping was given, and suggested the aseismic design method of multilevel fortification and hierarchical energy dissipation which can use the characteristic of laminated rubber bearing, through the bearing friction slipping, minimum support length and unseating prevention structures. Finally, the corresponding failure modes in the longitudinal and transverse directions were proposed and some questions needed to be studied further were discussed.

     

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