72m 120m 72m钢-混凝土组合连续梁桥设计

论文总字数：38282字

摘 要

钢-混凝土组合结构桥梁是指将钢梁与混凝土桥面板通过抗剪连接件连接成整体并考虑共同受力的桥梁结构形式。其基本力学原理是充分利用钢材的高抗拉强度和混凝土的高抗压强度, 形成经济合理的受力构件, 进而组成桥梁结构, 以最大限度地发挥两种材料的相对优势。可在一定程度上实现工厂化制造，减少现场工作，具有工程质量的可靠性。

考虑到结构受力的合理性及设计施工的复杂性和可操作性，基于实际情况进行方案比选后，本设计采用三跨钢-混凝土组合连续梁的方案，桥梁全长264m，跨径布置为72m 120m 72m。主梁为钢箱-混凝土组合梁，单箱单室的开口钢箱与混凝土板通过抗剪连接件连接。本设计的主要内容包括：

1. 结合已有的工程案例拟定本桥的主要构件尺寸，进行合理的设计。
2. 基于MIDAS/Civil软件建立桥梁上部结构的空间有限元模型，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。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，绘制施工图纸，包括总体布置图，主梁横断面图，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. 本设计书中设计可行，计算方法正确，主要构件尺寸合理，基本能够达到设计任务书中的要求，可作为参考施工。
2. 成桥阶段静力分析，本设计桥梁在恒载和活载下满足强度和刚度要求。
3. 施工阶段静力分析，本设计桥梁在各个施工阶段满足强度和稳定性要求。
4. 地震作用下分析，本设计桥梁满足承载力的要求。

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；施工图；

ABSTRACT

A steel-concrete composite structure bridge refers to a form of bridge structure that connects a steel beam and a concrete bridge panel through a shear connector and considers common force. The basic mechanics principle is to make full use of the high tensile strength of steel and the high compressive strength of concrete, form an economically reasonable force component, and then form a bridge structure to maximize the comparative advantages of the two materials. It can realize factory manufacturing to a certain extent, reduce field work,and have the reliability of engineering quality.

Considering the rationality of the structure force and the complexity and operability of the design and construction, based on the actual situation, the design adopts a three-span steel-concrete composite continuous beam scheme. The total length of the bridge is 264m and the span layout is 72m 120m 72m. The main beam is a steel box-concrete composite beam, and a single-chamber single-chamber open steel box is connected to the concrete plate through a shear connector. 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, structural drawings are accomplished by AutoCAD, including overall arrangements, cross section of girder, the structure of prestress steel strand, cables and bearings as well as construction drawings.

Conclutions from the design:

1. The design in this book is feasible, the calculation method is correct, the main components are reasonable in size, and they can basically meet the requirements in the design task book. It can be used as a reference for construction.

2. Static force analysis in the bridge phase. This bridge under constant load and live load meets the strength and stiffness requirements.

3. Static force analysis during the construction phase. This bridge meets the requirements of strength and stability during each construction phase.

4. Under the influence of earthquake, the design bridge meets the requirements of bearing capacity.

Keywords: composite beam bridge; finite element analysis; static analysis; construction phase analysis；structural drawings；

目 录

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

1.1.2.1 气象条件 1

1.1.2.2 工程地质 1

1.1.2.3 地震 2

1.2 设计要求 2

1.2.1 概述 2

1.2.2 规范与参考文献 2

1.2.3 设计原则 3

1.3 方案比选 4

剩余内容已隐藏，请支付后下载全文，论文总字数：38282字