4×30m的先简支后连续的预应力混凝土连续梁桥设计说明

石家庄铁道大学毕业设计

公路先简支后连续的预应力混凝土连

续梁桥设计

Design of Simply Supported for

Continuous

Prestressed Concrete Girder on the

Highway

完成日期2014年6月

毕业设计成绩单

毕业设计任务书

毕业设计开题报告

毕业设计开题报告

摘要

先简支后连续梁桥在实际运用中集合了简支梁桥和连续梁桥的优点，同时避免了简支梁桥桥面容易开裂和现浇连续梁施工的复杂繁琐。梁用批量预制生产的方式来加快连续梁的建设速度，以省去繁琐的支模工序，所以该桥型在桥梁建设中被广泛运用。

本文首先介绍了本毕业设计的工程背景，然后依据《公路桥涵钢筋混凝土和预应力混凝土结构设计规范》等规范对简支转连续施工的预应力混凝土连续梁桥进行初步设计，选取计算截面，接着通过软件Midas/Civil建模，并依据施工过程划分施工阶段，进行预应力筋的估算，最后进行整个结构的正截面抗弯、正截面抗裂以及混凝土压应力的验算并进行调整以满足要求。此外，依据《公路工程抗震设计规范》对桥墩进行抗震设计。

关键词：预应力混凝土；连续梁桥；简支转连续；Midas/Civi；抗震设计

Abstract

Prestressed concrete simply-supported to continuous beam bridge combine the advantages of simply supported girder bridge and continuous girder bridge,and avoid the simply supported girder bridge's deck cracking easily and the complex construction of continuous girder bridge,so accelerate the construction speed and construction is easy,In a word prestressed concrete simply-supported to continuous beam bridge is widely used in bridge construction.

This article first introduce the engineering background of the design. Then, based on "codes of Highway bridges and culverts reinforced concrete and prestressed concrete structural design " and other norms, the preliminary design of prestressed concrete continuous beam bridge of simply supported continuous construction is conducted. Selects cross-section of calculation. Followed by modeling through software of Midas / Civil and classifying construction phase according to the construction process, finally, we conduct a check on the resistance of flexural of normal section, the resistance of crack of normal section ,and concrete compressive stress and adjust in order to meet the requirement. In addition, based on "Codes of Highway Engineering Seismic Design", the seismic design of pier is conducted.

Key words:Prestressed concrete continuous beam bridges；Simply supported–continuous；

Midas/Civil；Seismic design

目录

第1章绪论 (1)

1.1 选题背景 (1)

1.2 先简支后连续箱梁的优势 (1)

1.3 设计基本资料 (2)

1.3.1 桥梁线性布置 (2)

1.3.2 主要技术标准 (2)

1.3.3 主要材料 (2)

1.3.4 桥面布置及铺装 (2)

1.3.5 施工方式 (3)

1.3.6 设计规范 (3)

1.3.7 温度影响 (3)

1.4 截面形式及截面尺寸拟定 (4)

1.4.1 截面形式的确定 (4)

1.4.2 截面尺寸的拟定 (4)

1.5 桥跨布置及孔径分配 (5)

1.6 毛截面几何特性计算 (5)

第2章上部结构计算 (7)

2.1 单元划分 (7)

2.2 恒载内力计算 (8)

2.2.1 恒载集度计算 (9)

2.3 活载内力计算 (15)

2.3.1 冲击系数和车道折减系数 (15)

2.3.3 活载内力计算 (16)

2.4 温度内力计算 (18)

2.5 支座沉降计算 (20)

2.6 荷载组合计算 (21)

2.6.1 正常使用极限状态组合 (22)

2.6.2 承载能力极限状态组合 (27)

第3章预应力钢束的估算与布置 (31)