论文总字数：55874字

摘 要

本设计是根据设计任务书的要求和 《公路桥规》的规定,对江苏连云港盐河大桥设计-右幅方案c桥段进行方案比选和设计的。连续梁桥是工程上广泛使用的一种桥型,它不但具有可靠的强度,刚度及抗裂性,而且具有行车舒适平稳,养护工作量小,设计及施工经验成熟的特点。设计一座梁桥必须从桥跨布设,尺寸拟定,钢束布置以及施工方法等方面综合考虑,还要充分考虑设计参数和环境影响。本设计是一联三跨连续梁桥，截面形式为单箱双室，纵向变截面；施工方式是悬臂（挂篮）施工整体现浇。该设计首先进行恒载、活载及次内力的计算,在此基础上进行荷载组合,绘制弯矩和剪力包络图；其次,根据短期效应组合配置预应力钢筋，并进行预应力损失的计算；最后，对该连续梁桥进行验算，是否满足设计要求。下部结构采用钻孔灌注桩，支座采用盆式橡胶支座，并分别对桥墩和桩基础进行了计算和验算。

本设计全部设计图纸采用计算机辅助设计绘制，计算机编档、排版，打印出图及论文。

关键词：设计 连续梁桥 悬臂施工（挂篮） 预应力

Design for jiangsu-lianyungan major bridge along the river

【Abstract】This is a partial struct design of Design for jiangsu-lianyungan major bridge along the river , according to designing assignment and the standard of road and bridge. The continuous beam bridge is a kind of bridge type used widely on the project. It not only has a reliable strength, stiffness and cracking, but also has a smooth journey comfortable, conservation work on the design and construction experience of the characteristics of maturity. Design a bridge must be laid across from the bridge-laying, the size of the development, steel beam layout and construction methods, but also give full consideration to the design parameters and environmental impact. This is a design for a three-span continuous bridge, whose cross-section is two-compartment, and changing on the road direction. The construction method is the construction of the cantilever (hanging basket). The first design includes constant load, the live load and the calculation of the internal forces. On the basis of a load combination, we can draw moment and shear envelope map. Next, according to the short-term effect combination disposition prestressed reinforcement, and carries on the loss of prestress the computation. Finally, carries on the checking calculation to this continuous bridge, whether to satisfy the design requirements.

All of the design drawings were protracted by Auto CAD. Except that the thesis called A note on dynamic fracture of the bridge bearing due to the great Hanshin–Awaji earthquake was translated into Chinese, and made a report on.

【Key Words】 design; continuous bridge; the cantilever (hanging basket); prestress

目录

摘要...............................................................

Abstract..........................................................

第一章、设计资料..................................................1

1.1 工程概况...................................................1

1.2 技术标准...................................................1

1.3 设计依据...................................................1

第二章、方案设计..........................................3

2.1 跨径布置..................................................3

2.2 截面选择..................................................3

2.3 梁高设计..................................................3

2.4 箱梁细部尺寸拟定..........................................3

2.5 梁底曲线..................................................4

2.6 工程材料选定..............................................4

2.7 支座强制位移..............................................5

2.8 温度影响..................................................5

第三章、毛截面几何特性..........................................6

第四章、恒载内力计算............................................10

4.1 一期恒载..................................................10

4.2 二期恒载..................................................12

第五章、活载内力计算............................................15

5.1 车道荷载计算..............................................15

5.2 人群荷载计算..............................................17

第六章、内力组合及内力包络图..................................20

6.1 承载能力极限状态内力组合..................................20

6.2 正常使用极限状态内力组合..................................22

6.2.1 短期作用效应组合.......................................22

6.2.2 长期作用效应组合.......................................25

第七章、预应力筋计算及布置....................................28

7.1 预应力钢筋截面面积估算....................................28

7.2 预应力钢束布置............................................32

7.2.1 横截面布置.............................................33

7.2.2 立面及平面布置.........................................34

7.3 后张法预应力钢筋布置具体要求..............................34

7.4 预应力锚具的选择..........................................35

第八章、截面几何特计算.........................................36

8.1 净截面几何特性............................................36

8.2 换算截面几何特性..........................................37

第九章、预应力损失及有效预应力计算............................38

9.1 预应力损失计算............................................38

9.1.1 摩阻损失.............................................38

9.1.2 锚具变形、钢筋回缩和接缝压缩引起的应力损失...........38

9.1.3 混凝土弹性压缩引起的应力损失.........................39

9.1.4 钢筋松弛引起的应力损失...............................40

9.2 有效预应力计算............................................41

第十章、次内力计算及组合........................................43

10.1 温度次内力...............................................43

10.2 支座沉降次内力...........................................45

第十一章、主梁截面验算..........................................48

11.1 正截面抗弯验算...........................................48

11.2 斜截面抗剪验算...........................................50

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