55m 110m 55m连续预应力混凝土箱梁桥设计

论文总字数：46297字

摘 要

在这个我国社会日新月异、蓬勃发展的时代，大力发展交通运输业对于促进整个社会的经济发展、文化交流和民族团结都有着十分重大的意义，同时它还有益于缩小区域经济发展差距，可以巩固我国的国防建设。而在交通运输业中，桥梁占据着举足轻重的位置，它在我国交通运输业发展中其到枢纽的作用。随着我国交通事业的大力发展，作为交通枢纽工程的桥梁工程需要大量的建设，而其中预应力混凝土连续梁桥以其结构和受力发布合理、伸缩缝设置合理、变形量合适、行车舒适度好、地形适应性强、设计施工技术成熟、造价合理、养护工程量小以及桥型简洁美观等优点在众多桥型中脱颖而出，因而在桥梁建设中，被广泛应用于高架、山区、城市、江河、等多个领域。预应力混凝土连续梁桥的施工方法有许多，其中悬臂施工法由于近些年的技术完善、机械化设备的使用以及施工成本低、有利于通航等优势，在近些年逐渐成为预应力混凝土连续梁桥施工中的首选方案。而本次毕业设计就是悬臂施工的预应力混凝土连续箱梁桥。

关键词：预应力 连续梁桥 悬臂施工 迈达斯

Design of 55m 110m 55m continuous prestressed concrete box girder bridge

Abstract

In this era of rapid and vigorous development of our society, it is of great significance to develop the transportation industry to promote the economic development, cultural exchange and national unity of the whole society. At the same time it is also beneficial to narrow the regional economic development gap, and strengthen our country's national defense construction. However, the bridge occupies a pivotal position in the transportation industry, and it plays an important role in the development of China's transportation industry. With the vigorous development of transportation in our country, as a transport hub project bridge engineering requires a lot of construction. However, the prestressed concrete continuous girder bridge in many types of bridge shows itself, with its the reasonable structure and stress, the reasonable and suitable expansion joint, the suitable deformation , the good driving comfort, the strong adaptability of terrain, the mature design and construction technology, the reasonable cost, a small amount of maintenance work and looks simple and beautiful. So, in bridge construction, it is widely applied in many fields, mountains, rivers, city viaduct, etc. There are many methods for the construction of prestressed concrete continuous beam bridge. In recent years, the cantilever construction method has gradually become the preferred solution to the construction of prestressed concrete continuous girder bridge, with technical improvement, the use of mechanical equipment and low cost of construction, conducive to navigation and other advantages. And this graduation project is the design of prestressed concrete continuous box girder bridge with the cantilever construction.

Key words: prestress, continuous girder bridge, cantilever construction, Midas

目录

摘要…………………………………………………………………………………………........1

Abstract………………………………………………………………………………………….2

第一章 绪 论……………………………………………………………………………………4

1.1课题的背景与意义……………………………………………………………………..4

1.2课题的主要工作、关键问题及难点…………………………………………………..4

第二章 预应力混凝土连续箱梁桥设计………………………………………………………..6

2.1概述……………………………………………………………………………………..6

2.1.1设计基本资料…………………………………………………………………...6

2.1.2桥型及纵、横断面布置………………………………………………………...7

2.1.3迈达斯桥梁软件简介、建模、荷载、施工阶段定义………………………...10

2.1.4截面的几何特性………………………………………………………………..11

2.2内力计算……………………………………………………………………………….12

2.2.1恒载内力计算…………………………………………………………………..12

2.2.2温度及支座沉降次内力计算…………………………………………………..14

2.2.3支座沉降次内力的计算………………………………………………………..15

2.2.4活载内力计算…………………………………………………………………..16

2.2.5第一次内力组合………………………………………………………………..16

2.3预应力钢束的估算和布置…………………………………………………………….20

2.3.1钢束的估算原理………………………………………………………………..20

2.3.2钢束的布置……………………………………………………………………..22

2.4预应力损失以及有效预应力的计算………………………………………………….23

2.5预加力、徐变次内力及内力组合…………………………………………………….27

2.5.1预加力产生的次内力的计算…………………………………………………..27

2.5.2徐变次内力的计算……………………………………………………………..29

2.5.3第二次内力组合………………………………………………………………..31

2.6持久状况截面承载能力极限状态计算……………………………………………….35

2.6.1正截面承载能力计算…………………………………………………………..35

2.6.2斜截面承载能力计算…………………………………………………………..36

2.7应力的计算和验算…………………………………………………………………….37

2.7.1短暂状况下的正应力验算（施工阶段正应力验算）………………………..37

2.7.2持久状况下的正应力验算（使用阶段正应力验算）………………………..39

2.7.3主应力的计算…………………………………………………………………..41

2.7.4变形验算以及预拱度的设置…………………………………………………..42

2.8小结与思考…………………………………………………………………………….44

致谢……………………………………………………………………………………………...45

参考文献………………………………………………………………………………………...46

1. 绪论

1.1课题的背景与意义

在这个我国社会日新月异、蓬勃发展的时代，大力发展交通运输业对于促进整个社会的经济发展、文化交流和民族团结都有着十分重大的意义，同时它还有益于缩小区域经济发展差距，可以巩固我国的国防建设。而在交通运输业中，桥梁占据着举足轻重的位置，它在我国交通运输业发展中其到枢纽的作用。随着我国交通事业的大力发展，作为交通枢纽工程的桥梁工程需要大量的建设，而其中预应力混凝土连续梁桥以其结构和受力发布合理、伸缩缝设置合理、变形量合适、行车舒适度好、地形适应性强、设计施工技术成熟、造价合理、养护工程量小以及桥型简洁美观等优点在众多桥型中脱颖而出，因而在桥梁建设中，被广泛应用于高架、山区、城市、江河、等多个领域。

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