20米预应力混凝土空心板桥设计毕业设计

郑州航空工业管理学院

毕业论文（设计）

2009 届土木工程专业班级

题目20米预应力混凝土空心板桥设计姓名学号

指导教师职称副教授二ОО九年五月二十七日

内容摘要

立足桥梁设计的基本原则，坚持合理选用标准，本着质量第一、节约资源的设计理念，以及综合考虑所提供的设计资料，本次设计——20米预应力空心板桥，主梁依照部分预应力A类构件方案设计，采用先张法超张拉工艺施工。依据《公路桥涵设计通用规范》《公路钢筋混凝土及预应力混凝土桥涵设计规范》等国家通用规范，依序完成承载能力及正常使用两大极限状态设计，以及持久和短暂状态应力验算，充分保证了本桥全寿命周期的安全度。

本次设计的内容主要包括：空心板、盖梁、桩柱三大部分的设计与计算。分别先后完成几何尺寸设计、荷载组合计算、钢筋配置及验算、预应力损失计算、裂缝及变形验算、持久和短暂状态应力验算等具体项目，每一部分都有详细、精确的计算过程。

本次设计成果有：计算书和配套施工图纸。

关键词

预应力；空心板；盖梁；桩柱

Abstract

The foothold bridge design's basic principle, insisted that selects the standard reasonably, in line with the quality first, nurse resources' design idea, the design information which as well as the overall evaluation provides, this design - - 20 meter pre-stressed hollow plank bridges, the king post according to the partial pre-stressed A kind of component project design, uses pretensioning law ultra to pull the craft construction. Rests on "Road Arch of bridge Design General Standard" "Road Reinforced concrete And Prestressed concrete Arch of bridge Design Standard" and so on national general standards, completes the bearing capacity in order and uses two big limiting condition design normally, as well as lasting and short condition stress checking calculation, has guaranteed this bridge total life cycle degree of security fully.

This design's content mainly includes: Spatial core, Ge Liang, pile three major part designs and computation. Does things in order of importance and urgency completes the geometry size design, the load combination computation, the steel bar disposition and the checking calculation, the loss of prestress computation, the crack and the distortion checking calculation, lasting and the short condition stress checking calculation and so on specific items, each part has in detail, the precise computational process.

This design achievement includes: Account book and necessary construction blueprint.

Key Words

Pre-stressed ; Spatial core ; Cap beam ; Pile

目录

第一章设计资料 (7)

1.1地质、地貌及标高 (7)

1.2跨径及桥宽 (7)

1.3设计荷载 (7)

1.4材料 (7)

1.4.1．混凝土 (7)

1.4.2钢筋 (8)

1.4.3.板式橡胶支座 (8)

1.5施工工艺 (8)

1.6结构尺寸 (8)

1.6.1 空心板的横断面尺寸见图所示： (8)

1.6.2 上部构造尺寸如下图： (9)

1.7设计依据和参考书 (9)

第二章设计内容 (9)

2.1 方案比选 (9)

2.2 上部结构计算 (11)

2.2.1主梁截面几何特性计算（先计算中板，后计算边板）.11

2.2.2 作用效应计算 (12)

2.3 预应力钢筋面积的估算及预应力钢筋布置 (21)

2.3.1 预应力钢筋数量的估算 (21)

2.3.2 预应力钢筋的布置 (24)

2.3.3 普通钢筋数量的估算和布置 (24)

2.4 主梁截面换算特性计算 (25)

2.4.1中板 (25)

2.4.2边板 (27)

2.5 主梁截面强度及应力验算 (28)

2.5.1正截面强度计算 (28)

2.5.2斜截面强度验算 (29)

2.6预应力损失计算 (34)

(34)

2.6.1锚具变形、钢筋回缩引起的应力损失σ

2l

2.6.2 加热养护引起的损失σ

(34)

3l

(35)

2.6.3预应力钢筋松弛引起的损失σ

5l

2.6.4混凝土弹性压缩引起的应力损失

σ (35)

4l

2.6.5混凝土收缩徐变引起的应力损失

σ (36)

6l

2.6.6预应力损失组合 (40)

2．7 正常使用极限状态计算 (41)

2.7.1 正截面抗裂性验算 (41)

2.7.2 斜截面抗裂性验算 (43)