（50+70+50）m连续刚构毕业设计计算书+设计说明+全套cad图纸

摘要

本毕业设计主要是对预应力混凝土连续刚构上部结构进行设计。连续刚构这种桥型结构刚度好、抗震性能好、墩梁固结有利于悬臂施工，减少了大型支座的养护维修和更换。在近二十余年来，随着预应力技术的发展和悬臂施工法的应用,连续刚构桥得到了广泛的应用。

本设计桥梁为跨度（50+70+50）m的预应力混凝土连续刚构，截面形式为单箱双室箱型。桥面宽度为20m，设计荷载标准为公路I级汽车荷载。主梁采用挂篮对称悬臂施工。设计流程如下：

第一步:确定主梁的主要构造和细部尺寸；

第二步:根据悬臂施工挂篮的起吊能力对主梁进行施工节段的划分；

第三步:在Auto CAD中建立计算模型并导入桥梁博士程序中，完成建模过程；

第四步:进行施工阶段内力分析，从而估算出所需纵向预应力筋的数目；

第五步:计算预应力损失及各项次内力，并进行主要截面验算；

最后：绘制工程图及编制说明书。

关键词：预应力混凝土连续刚构桥悬臂施工桥梁博士验算

The undergraduate design is mainly about the design of superstructure of pre-stressed concrete continuous rigid frame bridge.Thistype ofstructure has many advantages, such asexcellentstiffness,high capability to withstand earthquake.At the same time, the fixation between the pier and the girder isofbenefit to the cantilever constructionand prevents change and maintenance of large-size supports. With the development oftechnologyof pre-stressing and application ofcantileverconstruction,continuous rigid frame bridgehas got the extensive application in past 20 years.

This design is a prestressed concrete continuous rigid frame bridge for highway with the span of50+70+50m.Thecrosssection is the box sectionwithdoublecelland the width of thedeckis20m. The designed load standard is: highway-Ⅰ.The main girderis constructed bysymmetriccantilever equilibrium.The procedure of the design is listed as follows:

Firstly:design the main structuralconfigurationand detaildimensions.

Secondly:divide the girderintoconstructionsegmentsaccording to theraisingability of the basket.

Thirdly:the model is established in Auto CAD software and then importedintodoctorbridgesoftware.Finish theremainingestablishment of the model.

Fourthly:According to the internal force of the construction analyzed by the software we can distribute the tendons of the bridge.

Fifthly:calculate the lossof pre-stressingand secondary force, and then check the main cross-section

Finally, draw the engineering design and establish the design manuals.

Keywords:pre-stressed concrete continuous rigid frame bridge；cantilever construction；Doctorbridge；checking computations

中文摘要I

英文摘要ii

1工程概况1

1.1设计资料1

1.2方案比选1

1.3桥跨结构图式及尺寸拟定3

2荷载内力计算6

2.1恒载内力计算6

2.2活载内力计算9

2.3温度作用荷载计算15

3预应力钢束设计18

3.1估算预应力钢束18

3.2预应力钢束的布置21

4预应力损失及有效预应力计算24

4.1预应力损失的计算24

4.2有效预应力计算32

5次内力计算34

5.1徐变次内力34

5.2收缩次内力35

5.3预应力次内力36

5.4支座不均匀沉降次内力37

6内力组合39

6.1承载能力极限状态下的效应组合39

6.2正常使用极限状态下的效应组合41

7截面验算44

7.1施工阶段截面应力验算44

7.2承载能力极限截面强度验算46

7.3正常使用阶段截面应力验算49

7.3验算结论50

8施工组织设计51

8.1主梁分段与施工阶段的划分51

8.2主梁施工方法及注意事项52

总结54

致谢55

参考文献56

附录57