柞水河桥设计

设计总说明：在近些年经济技术的飞速发展下，物流与客流等行业对交通等基础设施的需求也越来越大；伴随着公路与铁路的快速建设，一大批桥梁相继被设计，施工，投入使用。本次毕业设计正是在此背景下，对横跨柞水河的柞水河桥进行设计，建成后可以承受公路-Ⅰ级荷载，满足双向四车道、时速为100Km/h的使用要求。整个设计过程中主要依据规范有：《公路桥涵设计通用规范》（JTG D60-2015）与《公路钢筋混凝土及预应力混凝土桥涵设计规范》（JTG D62-2004）；采用的主要设计材料为C50混凝土与1×7-15.24-1860标准型预应力钢绞线。在设计中，首先根据任务书给定桥址地形资料确定选用的桥型：由于桥墩较高，由方案评选确定采用预应力混凝土连续刚构桥；然后根据经验系数，确定桥梁细节尺寸；最后利用有限元分析软件Midas Civil 2015对桥梁进行建模分析，验算设计结果。

关键词： 刚构桥；设计；柞水河桥；Midas

The Design of Zhashui River Bridge

General description of the design: With development of economy and technology in recent years, the demands of transportation and other infrastructures has become greater in industries such as logistics and passenger flow; with the construction of highways and railways, a large number of bridges have been designed ,constructed and used. It is in this context that this graduation project is designed for the Zhashui River Bridge across the Zhashui River. After completion, it can withstand Highway-I-level loads and meet the requirements of two-way four-lane, hourly speed of 100Km/h. The main design criteria for the entire design process are: "General Specification for Design of Highway Bridges and Culverts" (JTG D60-2015) and "Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts" (JTG D62-2004); the main design material used is C50 concrete and 1 × 7-15.24-1860 standard type prestressed strand. In the first of this design, the type of bridge we selected based on the terrain data of the bridge address given by the task book: due to the high pier, the prestressed concrete continuous rigid frame bridge is determined by the selection of the scheme; then the bridge detail size is determined based on the empirical coefficient; finally, the finite element analysis is used. Software Midas Civil 2015 modeled the bridge and checked the design results.

KeyWords： Rigid Frame Bridge; Design; Zhashui River Bridge; Midas

目录

1. 设计资料 1

1.1 桥位及地质 1

1.2 主要技术标准 1

1.3 设计规范及依据 1

2 方案比选 3

2.1 设计原则 3

2.2 拟定方案 3

2.2.1 方案一:预应力混凝土连续梁桥 3

2.2.2 方案二: 预应力混凝土连续刚构桥 5

2.2.3 方案三:拱桥 6

2.3 方案比选 8

3 推荐方案细部尺寸拟定 10

3.1 桥面结构布置 10

3.2 上部结构 10

3.2.1 主梁纵向 10

3.2.2 横断面设计 10

3.3 下部结构 11

3.4 施工方法及节段划分 12

4 内力计算 14

4.1 模型建立 14

4.1.1 节点及单元 14

4.1.2 单元截面 14

4.1.3 主要参数 14

4.1.4 约束条件 15

4.1.5 模型荷载 16

4.2 内力计算结果 16

5 预应力钢筋估算及布置 18

5.1 估算依据 18

5.2 钢筋估算 18

5.3 钢束布置 20

6 强度验算 22

6.1 承载极限状态下正截面抗弯验算 22

6.2 承载极限状态下斜截面抗剪验算 23

6.3 正常使用状态下持久状况法向应力验算 25

6.4 正常使用状态下持久状况抗裂验算 28

6.5 短暂状况下应力验算 29

7 刚度验算及预拱度设置 31

7.1 挠度验算 31

7.2 预拱度设置 31

8 结论 32

致谢 33

参考文献 34

1. 设计资料

1.1 桥位及地质