钢筋混凝土简支T型梁桥计算书

本科毕业设计

xxxxxx桥设计

院（系、部）名 称 ：

专 业 名 称： 学 生 姓 名：

学 生 学 号： 指 导 教 师：

2012年6月1日

学 术 声 明

本人呈交的学位论文，是在导师的指导下，独立进行研究工作所取得的成果，所有数据、图片资料真实可靠。尽我所知，除文中已经注明引用的内容外，本学位论文的研究成果不包含他人享有著作权的内容。对本论文所涉及的研究工作做出贡献的其他个人和集体，均已在文中以明确的方式标明。本学位论文的知识产权归属于xxxxxxxxx。

本人签名： 日期：

指导教师签名： 日期：

摘要

摘 要

本设计是根据设计任务书的要求和《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)的规定,对xxxxxxx桥进行方案设计和结构设计的。对该桥的设计，本着“安全、经济、美观、适用”的八字原则，并根据地理位置、车流量多方面考虑，确定以混凝土T形简支梁桥为设计方案。

在设计中，桥梁上部结构的计算着重分析了桥梁在预加力阶段和运营阶段中恒载以及活载的作用，运用杠杆原理法、G-M法求出活载横向分布系数，并运用影响线进行活荷载最不利情况加载。进行了主梁的荷载计算、内力组合、截面设计与配筋、承载力验算、应力验算、抗裂性验算、变形验算等，同时也进行了支座设计、盖梁设计、桥墩设计和灌注桩设计，并分别对桥墩和桩基础进行了计算和验算。 关键词：混凝土；T形梁桥；双柱墩；钻孔灌注桩

Abstract

The design based on the reguirement of design assionment certification and the highway stipulation of rule of bridge is carried out scheme design and physical design on xxxxxx. The design is according to the principle of “safe、economical beautiful、suitable for use”. Addition to the geographic location; vehicle and other factors, we choose concrete T shape beam bridge as design-plan.

In the design, calculation of the superstructure emphasizedly analyse the function of the constant load and active load in the stage run. the lever principle and the G-M method are made to seek the quotiety of active load, and making use of the line of influence increase the weight in disadvantage conditions. I account the content of main beam、the design of section and choose steel rod、the check of the weight、the check of crack、the check of deformation and so on. At the same time I designed of brace, the beam of cover, the pier, cast-in-place pile. Keywords: concrete;beam bridge;double pier ;cast-in-place pile

I

目录

摘 要 ......................................................................................................................................... I Abstract ..................................................................................................................................... I 第一章 桥梁建筑设计 .............................................................................................................. 1 1 桥梁平面设计 ........................................................................................................................ 1 2 桥梁纵断面设计 .................................................................................................................... 1

2.1 桥梁总跨径的确定 ...................................................................................................... 2 2.2 桥梁的分孔 .................................................................................................................. 2 2.3 桥梁标高、桥上纵坡及基础埋深的确定 .................................................................. 2 3 桥梁横断面设计 .................................................................................................................... 2 4桥梁上部及下部设计 ............................................................................................................. 3

4.1上部结构 ....................................................................................................................... 3 4.2 人行道设计 .................................................................................................................. 4 4.3 支座设计 ...................................................................................................................... 4 4.4 桥墩设计 ...................................................................................................................... 5 4.5 桥台设计 ...................................................................................................................... 5 第二章 结构设计计算 .............................................................................................................. 7 1 设计资料 ................................................................................................................................ 7 2 主梁的计算 ............................................................................................................................ 8

2.1 跨中荷载弯矩横向分布系数 ...................................................................................... 8

2.1.1 主梁的抗弯及抗扭惯矩Ix和ITx ...................................................................... 8 2.1.2 横梁抗弯及抗扭惯矩 ........................................................................................ 8 2.1.3 计算抗弯参数和扭弯参数 ................................................................................ 9 2.1.4 计算荷载弯矩横向分布影响线坐标 .............................................................. 10 2.2 作用效应计算 ............................................................................................................ 14

2.2.1永久作用效应 ................................................................................................... 14 2.2.2 可变作用效应 .................................................................................................. 15 2.3 持久状况承载能力极限状态下截面设计配筋与验算 ............................................ 20

2.3.1 配置主筋 .......................................................................................................... 20 2.3.2 腹筋设计 .......................................................................................................... 22 2.3.3 箍筋设计 .......................................................................................................... 23 2.3.4 弯起钢筋及斜筋设计 ...................................................................................... 24

II

目录

2.4 持久状况正常使用极限状态下裂缝宽度验算 ........................................................ 30 2.5 持久状况正常使用极限状态下挠度验算 ................................................................ 31 3 横梁的计算 .......................................................................................................................... 32

3.1 横梁弯矩的计算 ........................................................................................................ 32 3.2 横梁截面配筋与验算 ................................................................................................ 36

3.2.1 正弯矩配筋 ...................................................................................................... 36 3.2.2 负弯矩配筋 ...................................................................................................... 36 3.3 横梁剪力效应计算及配筋设计 ................................................................................ 37 4 行车道板的计算 .................................................................................................................. 37

4.1 计算图式 .................................................................................................................... 37 4.2 永久荷载及其效应 .................................................................................................... 38 4.3 截面设计、配筋与强度验算 .................................................................................... 39 5 支座计算 .............................................................................................................................. 40

5.1 选定支座的平面尺寸 ................................................................................................ 41 5.2 确定支座厚度 ............................................................................................................ 41 5.3 验算支座的偏转 ........................................................................................................ 42 5.4 验算支座的抗滑稳定性 ............................................................................................ 42 6 下部结构设计资料 .............................................................................................................. 43 7 盖梁计算 .............................................................................................................................. 44

7.1 荷载计算 .................................................................................................................... 44 7.2 双柱反力Gi计算 ....................................................................................................... 52 7.3 内力计算 .................................................................................................................... 53

7.3.1 恒载加活载作用下各截面的内力 ................................................................. 53 7.3.2 盖梁内力汇总 .................................................................................................. 54 7.4 截面配筋设计和承载力校核 .................................................................................... 56

7.4.1 正截面抗弯承载力验算 .................................................................................. 56 7.4.2 斜截面抗剪承载力验算 .................................................................................. 57

8 桥墩墩柱设计 ...................................................................................................................... 58

8.1 荷载计算 .................................................................................................................... 58

8.1.1恒载计算 ........................................................................................................... 58 8.1.2 汽车荷载计算 .................................................................................................. 59 8.1.3 双柱反力横向分布计算 .................................................................................. 60

III

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