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1、第二篇 钢筋混凝土和预应力混凝土梁式桥 Part 2 RC & PC beam bridge,第一章 Chapter 1 梁式桥概述 Introduction of the beam bridge,BRIDGE ENGRG PART II,Chapter 1 梁式桥概述 Introduction of the beam bridge,1.1 Classification 类型的划分,（1）按承重结构的静力体系划分Classification based on the structural system,简支梁桥 Simple supported beam 连续梁桥 bridgeContinuo
2、us beam bridge 悬臂梁桥 Cantilever beam bridge,Development on the structure 结构体系的演变,简支梁 Simple supported beam,Span increasing 跨度增加,q,l,ql2/8,连续梁Continuous beam,悬臂梁Cantilever beam,1.1 Classification 类型的划分,（1）按承重结构的静力体系划分Classification based on the structural system （2）按承重结构的截面形式划分Classification based on
3、the structural section,板桥 肋板式梁桥 箱形梁桥,Chapter 1 梁式桥概述 Introduction of the beam bridge,截面形式的演变 Evolution of the section,实心板Solid slab,肋板 Slab with ribs,空心板Slab with hollow,T形梁T beam,箱梁Box girder,Span increasing 跨度增加,Chapter 1 梁式桥概述 Introduction of the beam bridge,Chapter 2 第二章 梁式桥设计要点与构造 Outline on th
4、e design and construct of beam bridge,Part 2 RC & PC beam bridge 第二篇 钢筋混凝土和预应力混凝土梁式桥,BRIDGE ENGRG PART II,1.1简支体系 Simple-supported structure,1.1.1简支板桥 Simple-supported slab bridge 建筑高度小 Height 外形简单，施工安装简便 Form 跨径不宜过大 Span,简支板的构造尺寸 Dimension of Simple-supported slab,1 梁式桥的立面布置 Elevation arrangement f
5、or beam bridge,1.1.简支体系 Simple-supported structure,1.1.2简支梁桥 Simple-supported beam bridge,简支梁的构造尺寸 Dimension of Simple-supported beam,1 梁式桥的立面布置 Elevation arrangement for beam bridge,Standard dimension of simple-supported beam 标准图简支梁的构造尺寸,1.1. Simple-supported structure 简支体系,1.1.2 Simple-supported b
6、eam bridge 简支梁桥,1 梁式桥的立面布置 Elevation arrangement for beam bridge,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,Single span with two cantilevers 单孔双悬臂梁桥T section T形截面 lx=(0.30.4) l Box girder 箱形截面 lx=(0.40.6) l,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.2 Cantileve
7、r beam system 悬臂体系,Three span with cantilevers and a hang Beam 三跨带挂梁单悬臂梁桥l1=(0.60.8) l lg=(0.40.6) l h=(1/121/20) lg H=(1.51.8) h,1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.2 Cantilever beam system 悬臂体系,Multi-span with double cantilevers and hang bea
8、ms多跨带挂梁双悬臂梁桥 l1=(0.750.8) l lg=(0.50.6) l,l,l1,lg,H,h,l,lg,1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥,T section T形梁 Box girder 箱形梁 h=(1/121/20) l h=(1/121/20) l H=(1.51.8) h H=(1.01.5) h,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.2 Cantilever beam system 悬臂体系,1.2.2 PC cantilever beam bridge 预
9、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. 50.8) l h=(1/201/25) l lg=(0.20.4) l H=(1.01.5) h,l,l1,lg,H,h,l,lg,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.2 Cantilever beam system 悬臂体系,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
10、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。,1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.2 Cantilever beam system 悬臂体系,Structural arrangement of rigid-frame刚构的布置形式：,1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥,1 梁式桥的立面布置 Elevation arrangem
11、ent for beam bridge,1.2 Cantilever beam system悬臂体系,T形刚构支点、跨中梁高与跨径的关系：带铰T形刚构 l100mH=(1/141/22) l h=(0.200.4) H 且h 1.0m带挂梁T形刚构l100mH=(1/171/21) l h=(0.200.4) H 且h 1.5m,1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.3 Continuous beam system 连续体系,Mid-span 中间跨
12、l =8 14m Side-span 边跨（ 0.70.8）l Height on mid-span section跨中截面高 h= (1/181/30)l Height on supported section支点截面高 H =(1.21.5)h,1.3.1 Continuous slab bridge 连续板桥,1 梁式桥的立面布置 Elevation arrangement for beam bridge,1.3 Continuous beam system 连续体系,不等跨变截面连续梁布置（以三跨为例） 边跨（ 0.60.8）l 支架施工可取0.8l 悬臂施工可取 0.65l 折线形变
13、截面支点截面高 H =(1/161/20)l，跨中截面高 h= (1/221/28)l 曲线形变截面 支点截面高 H =(1/161/20) l，跨中截面高 h= (1/301/50)l等跨等截面连续梁布置 截面高 h =(1/151/30)l ，常用 h= (1/181/20)l,1.1.1 Continuous beam bridge连续梁桥,1 梁式桥的立面布置 Elevation arrangement for beam bridge,2 design and construct of the slab bridge 板桥的设计与构造,2.1 form of the simple-su
14、pported slab bridge 简支板桥的构造,Section of slab 板桥的截面形式,Solid 实心板,Irregular shape异形板,Integral 整体式,Assemble 装配式,Solid 实心板,Hollow 空心板,(1) Reinforcement detail 配筋构造：主筋不小于 12mm720cm 且两侧边缘板带的主钢筋数量，宜较中间2/3板宽范围内板带增加15% 分布筋不小于 6 mm25cm 保护层厚度不小于2cm 深入支点的主筋总量不少于跨中主筋总量的1/4，且间距不少于每米3根,2.1.1 Cast-in-site slab bridge
15、 整体式板桥,2.1 Construct of the simple-supported slab bridge 简支板桥的构造,2.1.1 Cast-in-site slab bridge 整体式板桥,（2）实例 A case 标准跨径6m，桥面净宽-7m+2x0.2m,汽车-20级，挂车-100,2.1 Construct of the simple-supported slab bridge 简支板桥的构造,2.1.2 Construction of the prefabricated slab 装配式板桥的构造,装配式板桥分实心板和空心板 标准图实心铰接板 跨径为：1.5m、 1.0m， 1.5m， 2.0m， 3.0m， 4.0m， 6.0m和8.0m 桥面净宽按照老规范有净-7和净-9两种。,
