论文总字数：40000字

摘 要

伴随着桥梁工程的快速发展，新的结构形式开始应用在施工建设之中。钢-混凝土组合梁桥是由钢梁以及混凝土板，通过连接件连成整体而共同受力的承重结构。组合结构桥梁可以充分发挥钢材与混凝土这两种材料的各自优势，可以预制生产，最大程度地实现工厂化制造，减少现场操作，因而具有经济性与可靠性。

一方面综合考虑设计的经济合理性，一方面为了响应国家去产能的号召。基于实际情况进行方案比选后，本设计决定采用三跨钢-混凝土组合连续梁的方案，桥梁全长140m，为三跨连续梁，跨径布置为40m 60m 40m。主梁为钢箱-混凝土组合梁，单箱单室开口钢箱和预制混凝土上底板之间用焊钉连接。本设计的主要内容包括：

1.结合国内目前已有的工程案例，以及桥梁所在的地理位置与所处地理位置的自然条件拟定本桥的主要构架尺寸，进行合理的概念设计。

2.该桥梁设计基于MIDAS/Civil软件，建立全桥的空间有限元模型，模拟实际成桥状态下结构的受力情况。对模型进行静力分析、施工阶段分析以及抗震分析。得到了结构在最不利荷载组合下的受力和变形。根据分析结果，调整结构的尺寸，经校核后确定本桥的构造和尺寸。

3.依据规范及标准的要求，绘制不少于15张施工图纸，包括总体布置图，主梁横断面图，横隔板及横撑构造图，预应力钢束布置图，桥墩桥台构造图及施工过程示意图等。

设计总结：

1.本设计书中设计概念可行，计算方法正确，结构的应力及变形均符合规范要求，基本能够达到设计任务书中的要求，可作为参考进行施工。

2.钢-混组合梁桥中比较重要的是抗剪连接件的设计。由于考虑到要充分发挥两种材料在共同工作下的承载能力，以及自身设计水平，本设计中对抗剪连接件数量的设计比较保守。

关键词：钢箱-混凝土连续组合梁；有限元分析；静力分析；施工阶段分析；剪力连接；毕业设计

Abstract

With the development of bridge engineering, new structure forms begin to be applied in construction. The steel-concrete composite beam bridge is a load-bearing structure which is formed by connecting the steel beam and the concrete plate together through the connecting piece. The combined bridge structure can make the of their respective advantages of steel and concrete, which can maximize the factory-manufacturing efficiency and reduce the site operation reliability, thus has economic and engineering quality of the overall force.

On the one hand, we need to consider the economic rationality of the design, on the other hand, we should answer the call of DE-Capacity. Based on the actual situation, the scheme is decided by the design of the steel-concrete composite continuous beam. The total span of the bridge is 140m, and is divided into three parts as “40m 60m 40m”. The main girder is a steel - concrete composite beam, with a single open steel box with double chamber and precast concrete. The upper and the lower floors are joined by studs. The main contents of this design include:

1.Based on the design experience of similar as-built bridges and related researches, the basic size of the bridge is developed and the concept design is performed.

2.Take advantage of MIDAS/Civil and build the finite element model of the bridge, to the actual structure and loading condition. Put forward a static analysis and a construction phase analysis . The most dangerous load combinations are considered for the decision of final section sizes and some improvement measures are validated.

3.According to related design specifications, 15 structural drawings are accomplished by AutoCAD, including overall arrangements, cross section of girder, the structure of diaphragm, the structure of prestress steel strand, cables and bearings as well as construction drawings.

Conclusions from the design:

1.As the analysis results, this bridge is feasible in concept, correctly calculated and of reasonable force distribution. The stress and deformation are up to the assignment.

2.In the steel-concrete composite beam bridge, the design of shear connectors is more important than other parts. In order to make the most of the bearing capacity of steel and concrete under joint work, and considering the author’s own ability, the design of the number of shear connectors in the paper is more conservative.

KEY WORDS: composite beam bridge; finite element analysis; static analysis; construction phase analysis

目 录

摘 要 III

Abstract IV

第一章 设计背景及方案比选 1

1.1 设计资料 1

1.1.1 地理位置 1

1.1.2 自然条件 1

1.2 设计要求 3

1.2.1 概述 3

1.2.2 规范与参考文献 3

1.2.3 设计原则 3

剩余内容已隐藏，请支付后下载全文，论文总字数：40000字