摘要
该文以位于京沪高速铁路线上Ⅷ度地震区的大跨钢箱拱桥为工程背景,研究了非线性对地震反应的影响.结果表明:几何非线性的影响很小,地震反应分析时可以忽略不计;材料非线性能有效地减小拱截面所受的地震作用.因此建议大跨度拱桥在抗震设计时应注意将主次承重构件的抗震能力进行适当分级,以便有效地利用次要构件的非线性耗能来减轻主要承重构件所受的地震作用。
Taking the large-span steel box arch bridge inⅧearthquake area on Jinghu Express Railway as the engineering background,the article studies the influence of nonlinearity on the earthquake reaction.The result makes clearly that the influence of geometrical nonlinearity is very small,which can not take into account during the analysis of earthquake reaction.The nonlinear performance of material efficiently decreases the earthquake action borne by the arch section. Therefore,it is suggested that the anti-earthquake capability of the primary and secondary supporting members should be properly graduated when the anti-earthquake design of the large-span arch bridge so as efficiently to utilize the nonlinear consumption of secondary member to lighten the earthquake action borne by the primary supporting member.
出处
《城市道桥与防洪》
2009年第4期35-38,共4页
Urban Roads Bridges & Flood Control
关键词
非线性
拱桥
地震反应
nonlinearity
arch bridge
earthquake reaction
