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工程力学  2014 

考虑支座摩擦滑移的中小跨径桥梁抗震设计方法

DOI: doi:10.6052/j.issn.1000-4750.2012.12.0939, PP. 85-92

Keywords: 板式橡胶支座,摩擦滑移,保险丝式单元,最小支承长度,破坏模式

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Abstract:

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.

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