悬索桥设计论文

本科毕业设计成果

小跨度吊桥设计

作者姓名朱杰

指导教师秦值海

所在院系浙江工业大学

专业班级土木09

提交日期2011年10月7日

小跨度吊桥设计

The Design of Shot-span Suspension Bridge

Abstract

学生姓名：朱杰Student: ZhuJie

指导教师：秦值海Advisor: QinZhiHai

浙江工业大学

成人教育学院

毕业设计成果

A Thesis

Submitted to Zhejiang University of Technology

in Partial Fulfillment of the Requirements

for the Undergraduate Thesis in Automation

2012年6月

摘要

本设计为公路（13m+68m+13m）三跨柔性悬索桥，主跨68m，边跨对称13m。桥面系为钢结构，桥塔为钢筋混凝土结构。悬索桥很早以前就有了，到了近代发展速度十分迅猛，在现代桥梁工程实践中开始广泛应用，其特点是受力性能好、跨越能力大、轻型美观、抗震性能好。是跨越大江大河、海峡港湾等交通障碍的首选桥型。

本设计以悬索桥设计基本理论和静动力分析为理论基础，以成功修建的悬索桥为例，根据桥梁的位置、布置形式，拟定桥梁的跨度、矢高、吊杆间距、锚索倾角、桥塔高度和截面、塔基形式、锚碇构造等，说明选择相关参数的过程、依据、和考虑的主要因素，然后进行桥面系、主索边索、吊杆、索夹、抗风索、桥塔、锚碇等具体尺寸设计、配筋和验算。

桥面系采用工字钢横纵梁布置，主索用7×19钢丝绳，桥塔用C20钢筋混凝土，本桥相对悬索桥跨度较小，设计考虑恒载、风荷载和温度荷载，活载为汽-10和人行荷载，不考虑地震荷载。

由于悬索桥是超静定结构，计算较为烦琐，故在该设计中，结构单元划分和内力计算采用专业设计软件ansys进行，计算方法为有限元法，使设计工作量大大的简化，内力求出后，根据桥梁规范进行结构内力组合。最后，按容许应力法和极限状态法来验算主要截面，以判定设计的合理性。

关键词：悬索桥，桥面系，主索，桥塔，锚碇

THE DESIGN OF SHOT-SPAN SUSPENSION

BRIDGE

ABSTRACT

The subject of this thesis is the design of a suspension bridge, which the arrangement is 13m+68m+13m. The deck system is made of steel and the tower is composed concrete. Suspension brides with a long history are developing rapidly recently. In the family of bridge, the suspension bridges are widely applied in practical. For their merit of light distinguished capability of span, and aesthetic shape. It is the very best kind bridge to across wide rive, strait and gulf.

The subject is performed in according with the basic theory of suspension bridge dynamic and stationary analysis theory. The span, main cables tower and anchorages are designed in line with the arrangement of span. The way choose the parameters and decisive elements are illustrated. Thereafter, the sizes of deck system, main cables, end link, cable bands, storm system and anchorages are designed.

As a highly redundant system, it is inevitably brings us much difficult in the analysis of the internal forces by hand. The computer program, which named Ansys are used in course of calculation in order to simply the work. When the internal stress is carried out, the arrangement of internal stress is implemented in light of bridge specification. After checking the items required in the code for the across-sections, we can know the feasibility of the design.

Key word: suspension bridge ，deck system ，main cables ，pylons anchorages

目录

第一章绪论 (1)

1.1 悬索桥的分类、构造及主要特点 (1)

1.1.1 分类 (1)

1.1.2 主要构造 (1)

1.2 悬索桥的发展概况 (3)

1.3 悬索桥的计算理论简介 (4)

1.4 本文的主要工作 (5)

第二章悬索桥结构设计 (6)

2.1 设计方案比选 (6)

2.2 桥面系计算 (6)

2.2.1 桥面系构造 (6)

2.2.2 桥面系纵、横梁内力计算 (7)

2.3 主索和边索的计算 (20)

2.3.1 基本参数 (20)

2.3.2 主索内力计算 (20)

2.3.3 边索内力计算 (22)

2.3.4 索的强度验算 (22)

2.4 挠度验算 (22)

2.4.1 主索因温度及荷载作用下的挠度计算 (22)

2.4.2 边索因温度及荷载作用下引起主索跨中挠度的计算 (25)

2.4.3 最不利情况下跨中失高变化值的计算 (27)

2.5 抗风索的计算 (27)

2.5.1 抗风索布置 (27)

2.5.2 抗风索的设计 (28)

2.5.3 抗风索锚碇的设计 (30)

2.6 吊杆设计 (32)

2.6.1 吊杆形式和各部尺寸 (32)

2.6.2 吊杆承受的荷载内力 (32)

2.6.3 吊杆及连接件设计 (33)

2.7 索夹设计 (34)

2.7.1 索夹尺寸 (34)