摘 要

本次设计为装配式钢筋混凝土简支梁桥设计。利用给出的设计参数，结合规范标准进行相关设计内容。

已知设计参数：主梁：T型截面；跨径：标准跨径Lo=20米；荷载：公路—Ⅰ级；桥面净宽：净7.0附2×1.0米人行道；设计洪水位冲刷深度：0.5米；水流速度：小于1.0米/秒；桥墩高度：15.0米；地基土：完整基岩。

对给定的跨径、荷载、桥下净空高度、桥基水文地质、工程地质等资料，进行简支梁式桥设计。设计内容包括：桥跨结构设计与计算；支座设计与计算；重力式墩台结构设计与计算；桥基基础结构设计与计算；编写设计说明书，绘制建筑施工图、结构施工图。在设计过程中，先进行结构设计，再进行内力计算组合，然后进行强度计算和稳定性验算，保证符合规范标准要求，确保设计的合理性和安全性。

关键词：T形简支梁桥；内力；配筋；强度

Abstract

This is a design of prefabricated reinforced concrete beam bridge.Using the given design parameters and combining with the relevant design standards to finish this design content.

The known design parameters: the main girder is T section; the standard span Lo is 20 meters; the vehicle load on the bridge is highway - Ⅰ level; the net bridge deck width is 7.0 meters with two sidewalks of 1.0 meters ;the design flood scour depth is 0.5 meters; Flow rate is less than 1.0 m/s; Pier height: 15.0 meters; the foundation soil is complete bedrock.

Using the given data such as load, span and overhead clearance under the bridge, the bridge foundation hydrogeology, engineering geology and so on to design the simply supported beam bridge. Design content includes bridge span structure design and calculation, support design and calculation, gravity pier structure design and calculation, bridge foundation foundation structure design and calculation, writing design specifications, drawing the architectural working and the structure construction drawing. In the design process, firstly carries on the structure design, secondly do the combination of internal force calculation, and then do the strength calculation and stability checking to ensure that they meet standard requirements and the rationality of the design and safety.

Key Words：T beam bridge; Internal force; Reinforcement; Intensity

目 录

1 桥跨设计.....................................................................................................................................1

1.1 桥跨结构设计......................................................................................................................1

1.1.1 桥面系...........................................................................................................................1

1.1.2 主梁...............................................................................................................................1

1.1.3 横隔梁...........................................................................................................................2

1.2 主梁计算.............................................................................................................................2

1.2.1 内力计算.......................................................................................................................2

1.2.2 内力组合........................................................................................................................11

1.2.3 配筋计算........................................................................................................................12

1.2.4 裂缝宽度验算................................................................................................................20

1.2.5 挠度与预拱度................................................................................................................21

1.3 横隔梁设计...........................................................................................................................22

1.3.1 截面选择.....................................................................................................................22

1.3.2 截面内力计算.............................................................................................................23

1.3.3 配筋计算.....................................................................................................................25

1.4 行车道板............................................................................................................................27

1.4.1 恒载内力计算.............................................................................................................27

1.4.2 活载内力计算.............................................................................................................28

1.4.3 内力组合.....................................................................................................................29

1.4.4 配筋计算.....................................................................................................................29

2 支座设计...................................................................................................................................31

2.1 结构设计............................................................................................................................31

2.1.1 平面尺寸.....................................................................................................................31

2.1.2 支座厚度.....................................................................................................................31

2.2 支座验算............................................................................................................................32

2.2.1 支座偏转验算.............................................................................................................32

2.2.2 支座抗滑移稳定性验算.............................................................................................32

3 桥墩设计.................................................................................................................................34