大跨度钢管混凝土拱桥的地震易损性研究

发布时间：2018-03-10 04:13

本文选题：钢管混凝土拱桥　切入点：拱肋　出处：《苏州科技学院》2015年硕士论文　论文类型：学位论文

【摘要】：我国地处三大板块的交汇处,这就决定了我国也是地震频发的国家。作为生命线系统中重要而脆弱的部分,桥梁结构一旦发生破坏,将会严重影响救灾工作。另一方面,在当今的中国,桥梁建设在很大程度上促进了我国的经济的发展。因此,不论从抗震救灾的角度还是从经济发展的角度看,对桥梁进行地震易损性分析是十分有必要的。本文以某跨径为460m的大跨度钢管混凝土拱桥为研究对象,为了分析其地震易损性,主要进行了以下几个方面的研究:1.在查阅文献的基础上,对地震易损性进行了定义,并归纳和总结了桥梁地震易损性分析的理论和方法。2.对地震易损性曲线的建立流程进行了概括;探讨了地震波和损伤指标的选取,最终确定曲率延性比为损伤指标。3.使用有限元软件ANSYS建立大跨度钢管混凝土拱桥模型,并进行动力特性分析;以地面峰值加速度(PGA)为地震动强度指标,分别进行了横桥向和纵桥向的非线性动力时程分析。4.通过弯矩-曲率的分析,将各损伤状态的曲率延性比界限值量化。5.用传统可靠度方法建立大跨度钢管混凝土拱桥的地震易损性曲线,并通过数值模拟的验证传统可靠度方法的可行性。6.不改变其他任何条件,分析了地震波输入方式对拱桥拱肋易损性曲线的影响。
[Abstract]:China is located at the intersection of three major plates, which determines that China is also a country with frequent earthquakes. As an important and fragile part of the lifeline system, once the bridge structure is damaged, it will seriously affect the disaster relief work. In today's China, bridge construction has greatly promoted the economic development of our country. Therefore, whether from the angle of earthquake relief or economic development, It is necessary to analyze the seismic vulnerability of bridges. In this paper, a large span CFST arch bridge with a span of 460 m is taken as the research object, in order to analyze its seismic vulnerability. This paper mainly studies the following aspects: 1. On the basis of literature review, the earthquake vulnerability is defined. The theory and method of seismic vulnerability analysis of bridges are summarized. 2. The establishment process of seismic vulnerability curve is summarized, and the selection of seismic wave and damage index is discussed. Finally, the ratio of curvature to ductility is determined as damage index .3.The model of long-span concrete-filled steel tube arch bridge is established by using finite element software ANSYS, and the dynamic characteristics are analyzed. The nonlinear dynamic time history analysis of transverse bridge and longitudinal bridge is carried out respectively .4.Through the analysis of moment curvature, The curvature ductility ratio of each damage state is quantified. 5. The seismic vulnerability curve of long-span concrete-filled steel tubular arch bridge is established by using the traditional reliability method. The feasibility of the traditional reliability method is verified by numerical simulation. Without changing any other conditions, the influence of seismic wave input mode on the arch rib vulnerability curve of arch bridge is analyzed.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22

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