摘要预应力混凝土T形梁桥有结构简单，受力明确、节省材料、架设安装方便，跨越能力较大等优点。T型梁桥在我国公路上修建最多，早在50、60年代，我国就建造了许多T型梁桥，这种桥型对改善我国公路交通起到了重要作用。本着“安全、经济、美观、实用”八字原则。该桥分为5片、5跨，每跨40m，上部结构为连续梁。施工方法选为预制T梁法。
上部构造的计算拟定箱梁截面，对5×40m跨径进行了很详细的单元划分，计算恒载内力和活载内力，全桥均采用MIDAS软件进行了预应力筋束配筋和应力验算，且按新规范进行了预应力损失的计算。23985
毕业论文关键字：预应力筋 预制T梁 混凝土连续梁桥
Abstract
Prestressed concrete T beam bridge has a simple structure, stress, save material, the erection convenient installation, large spanning capacity, etc T girder bridge in highway construction in our country, most, in the early 50 s and 60 s was built in our country many T girder bridge, the bridge has played an important role in improving our country highway traffic. And on the basis of the four principles of “safety economy aesthetics and utility”. There are five beams and five spans, with each span 40m and successive beam in the superstructure. Because of this bridge adopts the separated Subgrade,design only consider half of the subgrade design. The construction takes the method of precast T beam.
The calculation of the superstructure is carried out with a supposed section of the box beam unit pision is done in detail on the 5×40m span to calculate the internal force of live loads and dead loads. The MIDAS has been applied during the calculation of the prestressing steel and the force, and the prestressing loss has been calculated referred to the new standards.
Keywords: Prestressed reinforcement
Prefabricated T beam
The concrete continuous girder bridge
目 录
1.绪论 6
1.1 预应力混凝土连续梁桥概述 6
1.2 毕业设计的目的与意义 8
2、设计资料 9
2.1、桥梁概况 9
2.2、设计参数 9
2.3、技术条件 10
2.4、设计要求 10
2.5、规范标准 10
3、桥跨总体布置及结构尺寸拟定 11
3.1本桥主料材料 11
3.1.1 混凝土 11
3.1.2 预应力钢绞线 11
3.2尺寸拟定 11
3.3 桥孔分跨 11
3.4 截面形式 12
3.4.1 立截面 12
3.4.2 横截面 13
3.5 梁高 14
4.荷载内力计算 16
4.1 恒载内力计算 16
4.2 主梁分段与施工方法 16
4.2.1分段原则 16
4.2.2具体分段 16
4.2.3主梁施工方法及注意事项 16
4.3 计算模型 17
4.3.1全桥模型 17
4.3.2荷载作用下产生的弯矩 17
4.3.3荷载作用下产生的剪力 17
4.4 恒载计算 17
4.4.1第一期恒载（结构自重） 18
4.4.2第二期恒载 18
4.5 支座位移引起的内力计算 19
4.6 各阶段荷载下的变形图 19
4.7 移动荷载的布置 22
5. 内力组合 24
5.1承载能力极限状态下的效应组合 24
5.2正常使用极限状态下的效应组合 27
6. 预应力钢束的估算与布置 29 MIDAS200m跨梁桥（预制T梁）设计+CAD图纸:http://www.751com.cn/gongcheng/lunwen_17284.html