桥梁工程课件 第2篇第1至2章A 梁式桥和板式桥设计

简支梁
Continuous beam
连续梁
ql2/8
Cantilever beam
悬臂梁
ql2/8
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
Chapter 1 Introduction of the beam bridge
梁式桥概述
1.1 Classification 类型的划分
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置
1.3 Continuous beam system 连续体系
1.1.1 Continuous beam bridge连续梁桥 不等跨变截面连续梁布置（以三跨为例） 边跨（ 0.6~0.8）l 支架施工可取0.8l 悬臂施工可取 0.65l 折线形变截面 支点截面高 H =(1/16~1/20)l，跨中截面高 h= (1/22~1/28)l 曲线形变截面 支点截面高 H =(1/16~1/20) l，跨中截面高 h= (1/30~1/50)l 等跨等截面连续梁布置 截面高 h =(1/15~1/30)l ，常用 h= (1/18~1/20)l
Three span with cantilevers and a hang Beam 三跨带挂梁单悬臂梁桥
l1
l lg H h
l1
l1=(0.6~0.8) l lg=(0.4~0.6) l h=(1/12~1/20) lg H=(1.5~1.8) h
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SCHOOL OF TRANSPORTATION, WUT
lx
H T section T形截面 Box girder 箱形截面
1 Elevation arrangement for beam bridge 梁式桥的立面布置 1.2 Cantilever beam system 悬臂体系
1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥
多跨带挂梁双悬臂梁桥
l1=(0.75~0.8) l lg=(0.5~0.6) l
T section T形梁 h=(1/12~1/20) l H=(1.5~1.8) h
Box girder 箱形梁 h=(1/12~1/20) l H=(1.0~1.5) h
l1 lg H
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l
l lg
h
PRODUCED BY：X J CHEN
SCHOOL OF TRANSPORTATION, WUT
1 Elevation arrangement for beam bridge 梁式桥的立面布置 1.2 Cantilever beam system 悬臂体系
1.2.2 PC cantilever beam bridge 预应力混凝土悬臂梁桥 PC cantilever beam bridge is more suitable for large span of more than 50m 跨度超过50m以上，采用预应力混凝土悬臂梁桥更合理。 l1=(0. 5~0.8) l h=(1/20~1/25) l lg=(0.2~0.4) l H=(1.0~1.5) h l1 l l lg lg H
1.1.1 Simple-supported slab bridge 简支板桥 Height 建筑高度小 Form 外形简单，施工安装简便 Span 跨径不宜过大 Dimension of Simple-supported slab 简支板的构造尺寸 Type 种 类
Solid 实心板 Hollow slab 装配式空心板
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置
1.2 Cantilever beam system悬臂体系
1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥 T形刚构支点、跨中梁高与跨径的关系： 带铰T形刚构 l≤100m H=(1/14~1/22) l h=(0.20~0.4) H 且h ≤1.0m 带挂梁T形刚构l≥100m H=(1/17~1/21) l h=(0.20~0.4) H 且h ≤1.5m
（1） Classification based on the structural system 按承重结构的静力体系划分 （2）Classification based on the structural section 按承重结构的截面形式划分
板桥 肋板式梁桥 箱形梁桥
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SCHOOL OF TRANSPORTATION, WUT
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h
SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置
1.2 Cantilever beam system 悬臂体系
1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥 由于施工阶段的受力与结构使用状态下的受力的一致性， T形刚构桥常是经济的方案。 全桥的T形单元尺寸尽可能相同， 以简化设计与施工； T形刚构的布置应尽可能对称，以避免T形刚构的桥墩承受 不平衡弯矩。
PRODUCED BY：X J CHEN
Single span with two cantilevers 单孔双悬臂梁桥 T section T形截面 lx=(0.3~0.4) l Box girder 箱形截面 lx=(0.4~0.6) l
• SCHOOL OF TRANSPORTATION, WUT
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置
1.2 Cantilever beam system 悬臂体系
1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥 Structural arrangement of rigid-frame刚构的布置形式：
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置 1.2 Cantilever beam system 悬臂体系
1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥 Multi-span with double cantilevers and hang beams
1.1.2 Simple-supported beam bridge 简支梁桥
Dimension of Simple-supported beam简支梁的构造尺寸 Type 种 类 RC PC Span 跨径 l（m） 8~20 20~40 Height 梁高（m） (1/11~1/18) l (1/15~1/25) l
PRODUCED BY：X J CHEN
Chapter 1 Introduction of the beam bridge
梁式桥概述 Evolution of the section 截面形式的演变
Solid slab
实心板 Span increasing Span increasing 跨度增加
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置 1.2 cantilever beam system 悬臂体系
1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥 lx l h h = (1/12~1/20) l H = (1.0~1.5)h h = (1/20~1/35) l H = (1.0~1.5)h
Prefabricated 装配式
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置
1.1. Simple-supported structure 简支体系 1.1.2 Simple-supported beam bridge 简支梁桥 Standard dimension of simple-supported beam 标准图简支梁的构造尺寸 R C P C Span (m) Height (m) Span (m) Height (m) 10 0.8~0.9 25 1.25~1.45 13 0.9~1.0 30 1.65~1.75 16 20 1.0~1.1 1.0~1.3 35 40 2.0 2.3
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Span
跨径（m） RC RC PC
Thickness
板厚（m）
≤8m 6~13 8~16
0.16~0.36 0.4~0.8 0.4~0.7
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置 1.1. Simple-supported structure 简支体系
Sla百度文库 with ribs
肋板
Slab with hollow
空心板
T beam
T形梁
Box girder 箱梁
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
BRIDGE ENGRG PART II
Part 2 RC & PC beam bridge
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
1 Elevation arrangement for beam bridge 梁式桥的立面布置
1.3 Continuous beam system 连续体系
1.3.1 Continuous slab bridge 连续板桥 Mid-span 中间跨 l =8 ~14m Side-span 边跨（ 0.7~0.8）l Height on mid-span section跨中截面高 h= (1/18~1/30)l Height on supported section支点截面高 H =(1.2~1.5)h
BRIDGE ENGRG PART II
Part 2 RC & PC beam bridge
第二篇 钢筋混凝土和预应力混凝土梁式桥
Chapter 1 第一章
Introduction of the beam bridge 梁式桥概述
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
Chapter 1 Introduction of the beam bridge
梁式桥概述
1.1 Classification 类型的划分
（1）Classification based on the structural system 按承重结构的静力体系划分 Simple supported beam bridge简支梁桥 Continuous beam bridge连续梁桥 Cantilever beam bridge悬臂梁桥
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SCHOOL OF TRANSPORTATION, WUT
PRODUCED BY：X J CHEN
Development on the structure 结构体系的演变
Simple supported beam
q l Span increasing Span increasing 跨度增加 ql2/8
第二篇 钢筋混凝土和预应力混凝土梁式桥
Chapter 2
第二章 Outline on the design and construct of beam bridge 梁式桥设计要点与构造
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武汉理工大学交通学院
制作：陈小佳
1 Elevation arrangement for beam bridge 梁式桥的立面布置 1.1 Simple-supported structure 简支体系