论文总字数：36356字

摘 要

ABSTRACT…………………………………………………………………… Ⅱ

1. 绪论…………………………………………………………………… 1

1.1预应力混凝土连续梁桥的特点…………………………………………… 1

1.2预应力混凝土连续梁桥的设计要点……………………………………… 1

1.3毕业设计的目的和意义…………………………………………………… 2

1. 设计基本资料和方案拟定………………………………………… 3

2.1设计基本资料……………………………………………………………… 3

2.1.1工程概况…………………………………………………………… 3

2.1.2主要技术标准和要求……………………………………………… 3

2.2方案设计…………………………………………………………………… 5

2.2.1桥梁纵断面设计…………………………………………………… 5

2.2.2桥梁横断面设计…………………………………………………… 6

2.2.3桥梁平面设计……………………………………………………… 8

1. 结构内力计算及包络图…………………………………………… 9

3.1荷载内力计算……………………………………………………………… 9

3.1.1永久荷载内力计算………………………………………………… 9

3.1.2可变荷载内力计算………………………………………………… 12

3.2荷载组合…………………………………………………………………… 16

1. 预应力钢筋估算和布置…………………………………………… 20

4.1预应力钢筋………………………………………………………………… 20

4.2预应力钢筋布置原则……………………………………………………… 20

4.3材料性能参数……………………………………………………………… 21

4.4预应力钢筋数量的确定…………………………………………………… 21

4.5截面几何性质计算………………………………………………………… 25

4.6预应力损失计算…………………………………………………………… 26

4.6.1预应力损失………………………………………………………… 26

4.6.2预应力损失组合…………………………………………………… 32

1. 纵梁验算……………………………………………………………… 33

5.1承载内力极限状态验算…………………………………………………… 33

5.1.1跨中正截面承载力验算…………………………………………… 33

5.1.2距支点L/2处斜截面抗剪能力验算……………………………… 34

5.2正常使用极限状态验算…………………………………………………… 35

5.2.1全预应力混凝土构件抗剪能力验算……………………………… 35

5.2.2变形计算…………………………………………………………… 38

5.3持久状况应力验算………………………………………………………… 40

5.3.1跨中截面混凝土法向应力验算…………………………………… 40

5.3.2跨中截面预应力钢筋拉应力验算………………………………… 40

5.3.3斜截面主应力计算………………………………………………… 43

5.4短暂状况应力验算………………………………………………………… 41

1. 下部结构设计…………………………………………………………43

6.1支座及桥墩尺寸拟定……………………………………………………… 43

6.2桩的设计方案……………………………………………………………… 45

结语……………………………………………………………………………… 47

参考文献………………………………………………………………………… 48

致谢……………………………………………………………………………… 49

北山河大桥设计

摘 要

本设计主要是关于大跨度预应力混凝土连续梁桥上部结构的设计。预应力混凝土梁桥具有受力性能好，变形小，变形曲线平顺，利于高速行车等优点，现在成为设计中主要的桥型。

本设计为北山河大桥，初步方案拟定为65 96 65m的三跨变高度连续梁桥，全长226米。根据单幅桥宽16米和连续梁的受力特点，截面形式选择单箱双室，桥面分为三车道加应急车道。施工方法采用满堂支架施工方法。

使用Midas进行结构计算，算出结构的恒载内力，求得恒载内力下的弯矩图和剪力图。计算各控制截面内力的影响线，并按最不利情况进行加载，求得活载作用下内里包络图。定义基础沉降组，按最不利组合求得基础沉降引起的内力。施加温度荷载，求得温度荷载下的内力，并进行荷载组合，根据各控制截面内力进行估束和配筋计算，并进行布置。最后，对各控制截面进行强度、抗裂性、应力和变形验算。

关键词：预应力混凝土 连续梁桥 单箱双室 Midas

The design for the North Mountain River Bridge

Abstract

The design is mainly about large-span continuous prestressed concrete beams Superstructure design. Prestressed concrete beam bridge with a force that is a good performance, small deformation, deformation curve smooth, conducive to high-speed driving, etc., is now the design of the main bridge.

The design for the North Mountain River Bridge, the initial programming for the 65 96 65m height of three - span continuous bridge, a total length of 226 meters. According to single bridge 16 meters wide and continuous mechanical characteristics of the beam cross-section in the form of a single box select double room, deck is divided into three lanes. Construction Methods Full support construction methods.

Midas structural calculation using calculated dead load internal force structure, and seek constant bending moment diagram and shear load diagram of internal force. Calculate the control section force influence lines, the most adverse circumstances to load, obtained under live load in the inner envelope. Definition of foundation settlement group, according to the most unfavorable combination of internal forces determined foundation settlement caused. Temperature load applied, the internal forces calculated temperature under load, and load combinations, according to the control section force were estimated beams and reinforcement calculation, and laid out. Finally, the cross-section of the control strength, crack resistance, stress and deformation analysis.

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