【摘要】 国内外针对大跨度钢管混凝土拱桥抗震方面的研究则处于相对薄弱的阶段,成桥实例很少,而国内现行公路及铁路桥梁抗震设计规范对此类桥梁结构的抗震性能也尚无具体规定.本文以四川白日坝大桥为工程背景,用ANSYS软件建立了该桥的空间有限元模型,进行了该桥的自振特性分析,讨论了拱肋、横撑等参数对其动力特性的影响.分析表明,拱肋刚度、横撑刚度及数量对钢管混凝土拱桥的动力特性具有较大的影响.更多还原

【Abstract】 For the design of many long-span bridges,arch bridge structure of such concrete has been widely adopted.Thus,the dynamic properties of such bridges have been showing more and more important value but neither abroad nor at home have specialists done enough research on this type of bridges.This paper,by using ANSYS software,has built up a 3D FEM model for computing and analyzing the dynamic characteristics of Bairiba Bridge,in Sichuan Province,which is a CFST arch bridge.Based on the model,the paper goes into details about its dynamic characteristics,particularly the effects of arch structures upon them.The results indicate that the rigidity of arch ribs and the rigidity and quantity of transverse brace both exert influence on the structures.更多还原