【土木】黄家垄特大桥第5联方案比选与施工图设计

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编号:20171225130919140    类型:共享资源    大小:13.36MB    格式:RAR    上传时间:2017-12-25
  
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土木 黄家垄特 大桥 方案 施工图 设计
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目录

1  设计说明1

1.1 概况1

1.2设计依据1

1.2.1技术指标1

1.2.2采用规范1

1.3 主要材料1

1.4 设计要点2

1.4.1 上部构造..........................................................................................2

1.4.2 下部构造...........................................................................................2

1.5施工方法2

2  方案拟定与比选3

2.1本设计(研究)的目的3

2.2 方案比选3

3  截面几何特性7

3.1 主要技术指标7

3.1.1 材料规格7

3.1.2 采用规范8

3.1.3毛截面几何特性计算8

3.2 单元离散9

4  内力计算10

4.1 内力计算10

4.1.1 结构重力10

4.1.2 人群荷载汽车荷载10

4.2 结构重力作用下内力10

4.3 荷载组合14

4.3.1 承载能力极限状态14

4.3.2正常使用极限状态18

5  预应力钢束的估算及布置33

5.1 预应力钢筋的估算33

5.2 预应力筋估算结果34

5.3 预应力筋束的布置原则42

5.4 预应力筋束的布置结果43

6  净截面及换算截面几何特性计算44

6.1净截面几何特性计算44

6.2换算截面几何特性计算44

7  预应力损失及有效预应力计算45

7.1 控制应力及有关参数的确定45

7.1.1 控制应力45

7.1.2 其他参数45

7.2 预应力钢筋与管道壁间摩擦引起的应力损失 的计算45

7.3 锚具变形、钢束回缩和接缝压缩一起的应力损失 的计算46

7.4 混凝土的弹性压缩引起的应力损失 的计算47

7.5 预应力筋束松弛引起的应力损失 的计算48

7.6 混凝土收缩和徐变引起的应力损失 的计算48

7.7 预应力损失组合及有效预应计算49

7.8 预应力损失计算结果49

8  结构验算52

8.1 强度验算52

8.1.1 基本理论52

8.1.2 计算公式53

8.2 应力验算53

8.2.1 基本理论53

8.2.2 预加应力阶段的正应力验算53

8.2.3 持久状况下正应力验算54

8.2.4 持久状况下的混凝土主应力验算56

8.3 结构验算结果58

8.4 承载能力极限状态强度验算63

8.5 变形(挠度)验算65

8.5.1 荷载短期效应作用下主梁挠度验算65

8.5.2 预加力引起的上拱度计算65

8.5.3 预拱度的设置66

9  设计图绘制67

9.1 概述67

9.2 总体布置图67

9.3 主梁一般构造图67

9.4 主梁预应力钢束构造图68

参考文献69

致    谢71

附件一(开题报告):72

附件二(英文原文及文献翻译):86




黄家垄特大桥连续梁桥方案的施工图设计


摘要


黄家垄特大桥,位于湖南省汝城至郴州汝郴高速23合同段。该桥的设计,遵照‘安全可靠’的基本原则,同时充分考虑了建造技术的先进性以及环境保护和可持续发展的要求。主桥为三跨一联的预应力混凝土等截面连续梁桥,桥梁全长120m,跨径组合为40m+40m+40m。桥面宽度为净-14+2×1.5(人行道)。桥面纵坡为2.8% 。桥墩基础采用钻孔灌注摩檫桩基础。主梁为单箱单室截面,采用50号混凝土;预应力钢筋采用ASTM A416-97a标准的低松弛钢绞线(1×7标准型)。

该桥的设计分为三部分:

1.桥型方案设计及比选;本设计以《公路桥梁设计规范》(JTG D60-2004)为依据,结合当地是地质、水文、气候条件,初拟三个方案:钢筋混凝土简支T梁桥、预应力混凝土连续刚构桥以及预应力混凝土等截面连续箱梁桥。通过三者的有缺点相比较,把3×40m等截面连续箱梁桥确定为设计方案。

2.上部结构设计及验算;根据规范和以往经验,进行结构细部尺寸拟定,本桥计算设计采用桥梁博士软件,建立有限元分析模型,添加边界条件,施加荷载,并考虑了施工阶段对结构计算的影响。首先得出永久作用的主梁内力,可变作用的影响线,和内力的包络图,得出最不利组合,并配置了预应力钢筋和普通钢筋。然后计算了预应力钢筋的损失,并对主梁截面进行承载力验算,应力验算和变形验算。

3.施工图设计。最后,根据设计规范的要求,采用AUTOCAD画出施工图,共15张图纸:方案比选图一,方案比选图二,方案比选图三,上部结构一般构造图,上部结构普通钢筋布置图,主梁预应力钢束构造图,基础构造图及配筋图,桥墩的一般构造图,人行道栏杆构造图,伸缩缝构造图,泄水管一般构造图,防撞栏构造图。

关键词:桥梁工程;毕业设计;方案比选;预应力混凝土连续梁桥;设计;验算




DESIGNING THE SHOP DRAWING OF HUANG JIA LONG BRIDGE IN THE SCHEME OF CONTINUOUS BEAM BRIDGE


ABSTRACT


Huang jia long Bridge is in Ru Cheng and Chen Zhou of Hu Nan province. According to the principles of safety, applicability, economy and esthetics, together with the standards of the advanced building techniques, the environmental protection and the sustainable development, the main bridge is a three-spanned continuous beam prestressed concrete bridge of continuous corss-sections. The length of the bridge is 120m. The spans are 40*3m respectively. The width of the bridge floor is 17m, with the net width of 14m plus the width of the two sidewalk of 3m(2×1.5m). The profile gradient is 2.8% . The foudation of the piers uses drilled grouted friction piles. The girder, which is single-box and single-room sectioned, uses NO.50 concrete. The prestressed reinforcements are made of ASTM A416-97a standard low-slack tendon. (1×7 standard).     The design of the bridge includes three parts: 

1. Designing and Selecting the Scheme of the Type of the Bridge; The pian design beam combination dimension sofcross-section,based on the ocative geographical ,hydrological,and climate conditions, guided by Standard Specifications for Highwat Bridges (JTJ D60-2004). After preliminary selection,three bridge type schemas are presented,they are common concrete simple-supportted T beam bridge , Prestressed concrete continuous rigid bridge and Cross-section of PC continous beam bridge. Comparing their characters comprehensively 3×40m Cross-scetion of PC continuous beam bridge is selection as the main design scheme.

2. Designing the Superstructure and Checking Computations;According, in accordance with norms and past experience,formulation the detailsize of the structure.The bridge calculation design adopts bridge doctot software, building up a limited dollar analysis model, increasing a boundary condition, exerting a lotus to carry, and considered construction stage to the structure calculating influence.First get the forever carry main dint inside the beam of function, living to carry of influence line, and the Inside dint to carry a function to wrap line diagram, getting the most disadvantageous combination of, and install to prepare suitablely in response to the dint reinforcing bar and the common reinforcing bar.Then computed to prepare in response to the loss of the dint reinforcing bar, and to the main beam cut noodles to carry on Load dint to check calculate, should the dint check to calculate and transform to check calculate. 

3. Designing the Shop Drawing.End, adopt AUTOCAD to draw a construction diagram according to the design request of[with] norm. Altogether 15drawing: The first scheme selected figure,The second scheme selected figure,The third selected figure.The upper structure general construction drawing.The upper structure common reinforced arrangement drawing.The girder structure drawing of prestressing tendons.The infrastructure figure and reinforcement figure.The general structure drawing of pier.The sidewalk baluster tectonic drawing.Expansion joint structure drawing. The discharge pipes general construction drawing.The expansion joint structure drawing.     

Key words: Bridge engineering;graduation design;voted scheme;Continuous beam prestressed concrete bridge;designing; checking computation



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