土木道桥毕业设计_30m上承式钢管混凝土拱桥

单跨30m上承式钢管混凝土拱桥设计

50m Single-span Concrete Filled Steel Tubular

Arch Bridge Design

摘要

近几十年来，随着科学技术的进步，国民经济的蓬勃发展，国家基础设施建设规模的不断扩大，我国桥梁建设取得了举世瞩目的成就，桥梁建筑技术也有了很大的进展。其中钢管混凝土系杆拱桥是近年来我国桥梁建设新发展的桥型，具有强度大，自重轻，抗变形能力强的特点。钢管混凝土结构在桥梁上的应用，同时解决了高强度材料的应用和施工的不方便两大难题，因而，钢管混凝土系杆拱桥在我国得到了迅速的发展。现在钢管混凝土拱桥向着更大跨径、更大规模方向发展，同时应用区域和范围也不断扩大，在建的重庆朝天门大桥（钢桁架系杆拱）的跨径已达到552m，比上海卢浦大桥长2m，成为新的同类桥型世界之最。此次设计是一50m钢筋混凝土柔性系杆拱桥，桥全长54m，桥面净宽9+2×0.5m，矢跨比采用1/5，采用二次抛物线形式拱肋，拱肋截面为哑铃型，设计荷载为公路一级，双向四车道。运用Midas Civil软件完成建模和施工阶段受力分析。取分析数据作为结构设计的依据。通过此次设计，对桥梁设计的全过程有一个从概念上到实际上的了解，加深对桥梁设计规范的掌握程度，同时也学会了运用桥梁软件Midas Civil。

关键词：钢管混凝土；Midas Civil；上承式拱桥

ABSTRACT

In recent decades，our country economy stability increases and the scientific technology develops quickly，more investment is put into the fundamental facilities，we accomplish a lot of great construction of bridges and a large improvement also be made in bridge construction technology.In our country，concrete fitted steel tubular (CFST) arch bridge is a new technique accompanied with bridge construction recently which are light deadweight，high strength and high resistance to deformation. It has solved two difficult of application and erection of high strength material in arch bridge. The CFST arch bridge has being developed quickly in our country. Now CFST arch bridge toward more and more

large-scale direction, but also regional and scope of application expanded, Chaotianmen Bridge under construction (steel tied arch truss) the span has reached 552m, compared with the Lupu Bridge length

2m, a new kind of bridge in the world. The design is a 50m flexible reinforced concrete arch bridge, bridge length 54m, bridge clear width 9 +2 × 0.5m, span ratio is 1 / 5, with parabolic arch forms, arch cross section for the dumbbell type, design load for the road level, two-way four lanes. Complete the modeling software using Midas Civil and Mechanical Analysis of the construction phase. Analysis of data taken as a basis for structural design. With this design, bridge design process from concept to a practical understanding of the mastery of bridge design specifications, but also learned to use bridge software Midas Civil.

Key words：concrete fitted steel tubular (CFST) arch bridge；Midas Civil；through arch

目录

第1章钢管拱桥发展概况 (1)

1.1钢管混凝土拱桥的发展概况 (1)

1.2钢管混凝土拱桥的特点 (2)

1.3上承式结构拱桥简介 (2)

第2章Midas Civil软件的介绍 (3)

第3章建模过程 (5)

3.1桥梁设计基本参数的选取 (5)

3.1.1拱肋材料及尺寸 (5)

3.1.2主梁材料及基本构造 (6)

3.1.3立柱与横向连接 (7)

3.1.4盖梁于横梁的基本构造 (7)

3.2利用Midas Civil软件的建模过程 (8)

3.2.1材料的基本设定 (8)

3.2.2截面的定义 (10)

3.2.3节点的建立 (13)

3.2.4单元的建立 (16)

3.2.5边界条件的定义 (19)

3.2.6荷载工况的定义 (20)

3.2.7二期荷载的布置 (25)

3.2.8自重转化为质量 (27)

3.2.9荷载转化质量 (27)

3.3运行结果 (28)

3.3.1周期与振型 (28)

3.3.2梁单元受力情况 (30)

3.3.3显示反力 (31)

3.3.4显示应力 (31)

3.3.5显示影响线 (32)

第4章检算过程 (34)

4.1内力作用组合 (34)

4.1.1作效应用组合基本原理 (34)

4.1.2冲击系数 (34)

4.1.3 主梁内力作用组合 (35)

4.1.4 拱肋内力作用效应组合 (35)