大跨径波形钢腹板梁桥与传统梁桥的地震响应对比研究

发布时间：2018-01-26 15:19

本文关键词： 波形钢腹板抗震分析动力反应谱法动态时程分析法地震波　出处：《中南林业科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：波形钢腹板预应力混凝土箱梁是采用波形钢腹板替代传统箱梁的混凝土腹板,是一种新型的钢一混凝土组合结构。与传统预应力混凝土箱梁相比,桥梁上部结构自重大约减轻了20%-30%,从而可以减少下部结构工程量,降低工程造价。工程实践表明,中、大跨径的桥梁采用波形钢腹板箱梁结构能够减轻桥梁上部结构的重量,降低地震激励的作用效果,提高桥梁的抗震性能。本文以一座大跨径传统连续箱梁桥为工程背景,结合波形钢腹板箱梁的受力性能,将其腹板用波形钢替代,对其进行地震响应分析。主要包括如下内容： 1、论述了波形钢腹板箱梁桥的发展概况、结构特点和受力性能,介绍了大跨径连续梁桥抗震分析方法的发展和连续梁桥抗震设计现状。 2、介绍了桥梁抗震分析方法的基本理论知识,包括静力法、动力反应谱法和动态时程分析法。采用波形钢腹板代替厚重的混凝土腹板对比设计,建立了结构动力有限元分析模型。 3、依托已建的一座大跨径传统连续梁桥—攸水大桥,采用桥梁结构通用分析软件Midas Civil建立了空间有限元模型,选取主梁高跨比、梁底变化线形及横隔板间距三个设计参数进行反应谱分析,获得不同参数变化对桥梁地震响应特性的影响规律,并与传统连续箱梁桥的地震响应特性进行对比分析。 4、采用时程分析法,研究了波形钢腹板和传统梁桥在不同的地震波作用下的结构反应特点,并与原桥的相应地震波作用下的反应情况进行对比分析。
[Abstract]:Corrugated steel web prestressed concrete box girder is a new type of steel-concrete composite structure, which uses corrugated steel web to replace the traditional box girder. It is compared with the traditional prestressed concrete box girder. The weight of the superstructure of the bridge is about 20% -30%, which can reduce the quantity of the substructure and the cost of the project. The use of corrugated steel web box girder structure in long-span bridges can reduce the weight of the bridge superstructure, reduce the effect of earthquake excitation, and improve the seismic performance of the bridge. Based on the engineering background of a long-span traditional continuous box girder bridge and combined with the mechanical performance of corrugated steel web box girder, the web plate is replaced by corrugated steel, and the seismic response analysis is carried out. The main contents are as follows: 1. The development of corrugated steel web box girder bridge, its structural characteristics and mechanical properties are discussed. The development of seismic analysis method for long span continuous beam bridge and the present situation of seismic design of continuous beam bridge are introduced. 2. The basic theoretical knowledge of seismic analysis method of bridge is introduced, including static method, dynamic response spectrum method and dynamic time history analysis method. The dynamic finite element analysis model of the structure is established. 3. Based on a long span traditional continuous girder bridge-Youshui bridge, the spatial finite element model is established by using the general analysis software Midas Civil of bridge structure, and the ratio of height to span of main girder is selected. The response spectrum analysis of the three design parameters of beam bottom change line shape and transverse spacer spacing is carried out to obtain the influence of different parameters on the seismic response characteristics of the bridge. The seismic response characteristics of traditional continuous box girder bridges are compared and analyzed. 4. The structural response characteristics of corrugated steel web and traditional beam bridges under different seismic waves are studied by time history analysis, and the response of the bridge under the action of corresponding seismic waves is compared with that of the original bridge.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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