桥梁工程第篇A梁式桥和板式桥设计.pptx

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1、Development on the structure 结构体系的演变结构体系的演变Simple supported beam简支梁Span increasing 跨度增加qlql2/8ql2/8ql2/8SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHENContinuous beam 连续梁Cantilever beam悬臂梁第1页/共70页 1.1 Classification 类型的类型的划分划分（1）Classification based on the structural system 按承重结构的静力体系划分（2）Classifi

2、cation based on the structural section 按承重结构的截面形式划分n板桥n肋板式梁桥n箱形梁桥SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHENChapter 1 Introduction of the beam bridge 梁式桥概述第2页/共70页Evolution of the section 截面形式的演截面形式的演变变Solid slab实心板Slab with ribs肋板Slab with hollow空心板T beamT形梁Box girder箱梁Span increasing 跨度增加SCH

3、OOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHENChapter 1 Introduction of the beam bridge 梁式桥概述第3页/共70页武汉理工大学交通学院 制作：陈小佳Chapter 2 第二章 Outline on the design and construct of beam bridge 梁式桥设计要点与构造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 ENGRGPART II第4页/共70页1 Elevation arrangement for beam brid

4、ge 梁式桥的立面布置 1.1 Simple-supported structure 简支体系简支体系1.1.1 Simple-supported slab bridge 简支板桥nHeight 建筑高度小nForm 外形简单，施工安装简便nSpan 跨径不宜过大Type 种 类Span 跨径（m）Thickness 板厚（m）Solid 实心板RC8m0.160.36Hollow slab 装配式空心板RC6130.40.8PC8160.40.7Dimension of Simple-supported slab 简支板的构造尺寸 SCHOOL OF TRANSPORTATION,WUT P

5、RODUCED BY：X J CHEN第5页/共70页1.1.1.1.Simple-supported structure 简支体系简支体系1.1.2 Simple-supported beam bridge 简支梁桥Type 种 类Span 跨径 l（m）Height梁高（m）Prefabricated 装配式RC 820(1/111/18)lPC2040(1/151/25)lDimension of Simple-supported beam简支梁的构造尺寸 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arran

6、gement for beam bridge 梁式桥的立面布置第6页/共70页RCSpan(m)10131620Height(m)0.80.90.91.01.01.11.01.3PCSpan(m)25303540Height(m)1.251.451.651.752.02.3Standard dimension of simple-supported beam 标准图简支梁的构造尺寸 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1.1.Simple-supported structure 简支体系简支体系1.1.2 Simple-suppor

7、ted beam bridge 简支梁桥1 Elevation arrangement for beam bridge 梁式桥的立面布置第7页/共70页1.2 cantilever beam system 悬臂体系悬臂体系1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥T section T形截面h=(1/121/20)lH=(1.01.5)hBox girder箱形截面h=(1/201/35)lH=(1.01.5)hnSingle span with two cantilevers单孔双悬臂梁桥T section T形截面lx=(0.30.4)lBox gi

8、rder 箱形截面lx=(0.40.6)lHhllxlxSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置第8页/共70页1.2 Cantilever beam system 悬臂体系悬臂体系nThree span with cantilevers and a hang Beamn三跨带挂梁单悬臂梁桥l1=(0.60.8)llg=(0.40.6)lh=(1/121/20)lgH=(1.51.8)hHhll1l1lgSCHOOL OF TRANSPORT

9、ATION,WUT PRODUCED BY：X J CHEN1.2.1 RC cantilever beam bridge 钢筋混凝土悬臂梁桥1 Elevation arrangement for beam bridge 梁式桥的立面布置第9页/共70页1.2 1.2 Cantilever beam system 悬臂体系悬臂体系nMulti-span with double cantilevers and hang beams 多跨带挂梁双悬臂梁桥l1=(0.750.8)llg=(0.50.6)lll1lgHhllgSCHOOL OF TRANSPORTATION,WUT PRODUCED

10、BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置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第10页/共70页1.2 1.2 Cantilever beam system 悬臂体系悬臂体系1.2.2 PC cantilever beam bridge 预应力混凝土悬臂梁桥PC cantilever beam bridge is m

11、ore 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)hll1lgHhllgSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置第11页/共70页1.2 1.2 Cantilever beam system 悬臂体系悬臂体系 由于施工阶段的受力与结构使用状态下的受力的一

12、致性，T形刚构桥常是经济的方案。n 全桥的T形单元尺寸尽可能相同，以简化设计与施工；n 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。SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥第12页/共70页1.2 1.2 Cantilever beam system 悬臂体系悬臂体系Structural arrangement of rigid-frame刚构的

13、布置形式：SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥第13页/共70页1.2 1.2 Cantilever beam system悬臂体系悬臂体系T形刚构支点、跨中梁高与跨径的关系：n 带铰T形刚构 l100m H=(1/141/22)l h=(0.200.4)H 且h 1.0mn 带挂梁T形刚构l100m H=(1/171/21)l h=(0.200.4)H 且h

14、1.5mSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置1.2.3 PC rigid-frame bridge 预应力混凝土T形刚构桥第14页/共70页1.3 1.3 Continuous beam system 连续体系连续体系nMid-span 中间跨 l=8 14m nSide-span 边跨（0.70.8）l nHeight on mid-span section跨中截面高 h=(1/181/30)lnHeight on supported

15、section支点截面高 H=(1.21.5)h1.3.1 Continuous slab bridge 连续板桥 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置第15页/共70页1.3 1.3 Continuous beam system 连续体系连续体系不等跨变截面连续梁布置（以三跨为例）n边跨（0.60.8）l 支架施工可取0.8l 悬臂施工可取 0.65ln折线形变截面 支点截面高 H=(1/161/20)l，跨中截面高 h=(1/221/

16、28)ln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n截面高 h =(1/151/30)l，常用 h=(1/181/20)l1.1.1 Continuous beam bridge连续梁桥SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN1 Elevation arrangement for beam bridge 梁式桥的立面布置第16页/共70页2 design and construct of the slab bridge 板桥的设计与构造2.1 2.1 form of

17、the simple-supported slab bridge 简支板简支板桥的构造桥的构造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 空心板第17页/共70页(1)Reinforcement detail 配筋构造：n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%n分布筋不小于 6 mm25cmn保护层厚度不小于2cmn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 2.1

18、.1 Cast-in-site slab bridge 整体式板桥整体式板桥SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN2.1 Construct of the simple-supported slab bridge 简支板桥的构造第18页/共70页2.1.1 2.1.1 Cast-in-site slab bridge 整体式板整体式板桥桥（2）A case 实例 标准跨径6m，桥面净宽-7m+2x0.2m,汽车-20级，挂车-100SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN2.1

19、 Construct of the simple-supported slab bridge 简支板桥的构造第19页/共70页2.1.2 2.1.2 Construction of the prefabricated slab 装配式板桥装配式板桥的构造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。SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN2.1 Construct of the simple-supporte

20、d slab bridge 简支板桥的构造第20页/共70页2.1 简支板桥的构造 2.1.2 2.1.2 Construction of the prefabricated slab装配式板装配式板桥的构造桥的构造 标准图实心铰接板实例 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN第21页/共70页2.1 Construct of the simple-supported slab bridge 简支板桥的构造2.1.2 2.1.2 Construction of the prefabricated slab装配式板桥装配式板桥的构造的构

21、造Transverse connection 装配式板桥的横向联接l企口混凝土铰连接l钢板连接 企口混凝土铰连接 钢板连接 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN第22页/共70页2.1.1 2.1.1 Static characteristic of the skew bridge斜交板桥的斜交板桥的受力特点受力特点力的传递规律 正交简支板 斜交简支板 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN2.2 Features of the skew bridge 斜交板桥的特点第23

22、页/共70页2.1.1 2.1.1 Static characteristic of the skew bridge 斜交板桥的斜交板桥的受力特点受力特点受力特点 斜跨径l的简支斜板的纵向主弯矩比同宽、跨径l 的正交简支板之值小，并随斜交角的增大而减小；bb在与钝角的平分线相垂直的方向上，具有较大的负弯矩，并随斜交角的增大而增大，其分布范围不宽并迅速消减；支撑边上的反力很不均匀，在两钝角部分的支座压力要大得多，而锐角处反力较小，甚至出现负反力（上翘）；lSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN2.2 Features of the sk

23、ew bridge 斜交板桥的特点l第24页/共70页2.1.2 2.1.2 Construction features of the skew slab斜交板桥的构斜交板桥的构造特点造特点整体式斜交板 城市板桥l与b 较接近（l/b 1.3 n当=2535，平行四边形布置；n当=4060，主筋延斜边布置，分布筋两钝角之间垂直于主筋，在支撑边附近着平行于支撑边；=4060=2535SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN第26页/共70页3.1 Construct characteristic of the simple-support

24、ed and fabricated RC beam bridge 装装配配式式简支梁桥的构造特点简支梁桥的构造特点1.Section 截面型式 槽形、T形和箱形。3.1 Construction features of the prefabricated simple-supported beam bridge装配式简支梁桥的构造特点SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN第27页/共70页槽形截面的特点：n施工稳定性好，安装较方便；n腹板薄，配筋通常只能采用钢筋网片，难以形成骨架；n钢筋用量相对较多，构件重量较大；n通常采用钢筋混凝土

25、(RC)，适用跨径为612m。1.Section 截面型式SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.1 Construct characteristic of the simple-supported and fabricated RC beam bridge 装配装配式简支梁桥的构造特点式简支梁桥的构造特点第28页/共70页武汉理工大学交通学院 制作：陈小佳T形截面的特点：n制造简单；n肋内配筋可以做成钢筋骨架；n整体性较好，接头方便n施工稳定性差，运输和安装较复杂；n构件在桥面板的跨中接头，对板的受力不利；n采用RC时，适用跨径为

26、4.520m；采用PC时，适用跨径为2040m；1.Section 截面型式跨中接头位置3.1 Construct characteristic of the simple-supported and fabricated RC beam bridge 装配装配式简支梁桥的构造特点式简支梁桥的构造特点第29页/共70页箱形截面的特点：n抗扭刚度大，偏心荷载下梁的受力较均匀；n横向抗弯刚度大，稳定性好；n制作较复杂，重量相对较大；1.Section 截面型式SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.1 Construct charact

27、eristic of the simple-supported and fabricated RC beam bridge 装配装配式简支梁桥的构造特点式简支梁桥的构造特点第30页/共70页块件划分的原则（1）技术可行：预制、吊装、运输条件（2）受力较小：接缝的位置（3）施工简单：接缝的数量（4）力求标准化块件划分方式（1）纵向竖缝（2）纵向水平缝（3）纵、横向竖缝 2.块件划分SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.1 Construct characteristic of the simple-supported and fab

28、ricated RC beam bridge 装配装配式简支梁桥的构造特点式简支梁桥的构造特点第31页/共70页（1）纵向竖缝 2.块件划分AAA-A延纵向的竖缝 g恒载应力Mg+p活载应力Mp=g+p应力总和SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.1 Construct characteristic of the simple-supported and fabricated RC beam bridge 装配装配式简支梁桥的构造特点式简支梁桥的构造特点第32页/共70页3.1 Construct characteristic o

29、f the simple-supported and fabricated RC beam bridge 装配装配式简支梁桥的构造特点式简支梁桥的构造特点（1）纵向水平缝 2.块件划分AAg恒载应力MgA-A延纵向的水平缝 +p活载应力Mpp=g+p应力总和pSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN第33页/共70页主梁布置横隔梁布置3.2.1 构造布置构造布置 bl/2l/2l/4l/4b端横隔板中横隔板1/4横隔板AAA-ABBB-BSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3

30、.2 design and construct of simple-supported and fabricated RC beam bridge 装配式钢筋混凝土简支梁桥第34页/共70页主梁及横隔梁布置实例3.2.1 构造布置构造布置 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.2 design and construct of simple-supported and fabricated RC beam bridge 装配式钢筋混凝土简支梁桥第35页/共70页主梁3.2.2 截面尺寸的拟定截面尺寸的拟定 边梁中梁1518cmh=

31、(1/111/16)lh=3/4hRA68cmh/12150220cmSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.2 design and construct of simple-supported and fabricated RC beam bridge 装配式钢筋混凝土简支梁桥第36页/共70页横隔板 3.2.2 截面尺寸的拟定截面尺寸的拟定 横隔板16cm梁高h=3/4hR14cmSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.2 design and construct o

32、f simple-supported and fabricated RC beam bridge 装配式钢筋混凝土简支梁桥第37页/共70页n 主筋n 主筋的弯起n 分布钢筋n 其它构造钢筋n 保护层3.2.3 钢筋构造钢筋构造 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.2 design and construct of simple-supported and fabricated RC beam bridge 装配式钢筋混凝土简支梁桥第38页/共70页干接头 湿接头3.2.4 装配式主梁的连接构造装配式主梁的连接构造 SCHOOL

33、 OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.2 design and construct of simple-supported and fabricated RC beam bridge 装配式钢筋混凝土简支梁桥第39页/共70页n湿接头实例3.2.4 装配式主梁的连接装配式主梁的连接构造构造 连接前 连接后 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.2 design and construct of simple-supported and fabricated RC beam bri

34、dge 装配式钢筋混凝土简支梁桥第40页/共70页n 端部梁肋加厚n 梁肋下部加宽成马蹄形n 翼缘板加宽3.3.1 构造布置构造布置 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第41页/共70页n 核心截面概念 作用在核心区域内的轴向力在截面上将不产生拉应力3.3.2 截面尺寸拟定截面尺寸拟定 PPhx=0s=01/3h1/3h1/3h核心距SCHOOL OF TR

35、ANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第42页/共70页n 截面上受弯矩和轴向力作用时,弯矩的作用等效于轴向力上移一段距离：3.3.2 截面尺寸拟定截面尺寸拟定 P hePMe=M/PSCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabr

36、icated PC beam bridge 装配式预应力混凝土简支梁桥第43页/共70页n 施工阶段-施加预应力3.3.2 截面尺寸拟定截面尺寸拟定 eNy-Ny ehNy+Mg1ee=Mg1/NyeNyku下核心点一期恒载SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第44页/共70页n运营阶段 3.3.2 截面尺寸拟定截面尺寸拟定 e-+Mg2+Mp二期恒载及活载N

37、y e-Mg1hNy-Nye=ko+ku=(Mg2+Mp)/(Ny-Ny)eeku上核心点koNy-NyNy-NySCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第45页/共70页结论n截面设计中应使截面的形心位置要高，以加大偏心距e，从而节省预应力筋的数量；e=Mg1/Ny Ny e=Mg1n截面核心距的大小体现了运营阶段承受荷载的能力，而且核心距k值越大，预应力筋就越

38、节省；ko+ky=(Mg2+Mp)/(Ny-Ny)(Ny-Ny)(ko+ky)=(Mg2+Mp)3.3.2 截面尺寸拟定截面尺寸拟定 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第46页/共70页截面效率指标=k/h好的预应力T形梁设计，应当是截面效率指标大，形心位置高。一般地说，腹板愈薄，值也愈大；马蹄愈小，翼缘愈宽，则形心位置越高。3.3.2 截面尺寸拟定截面尺寸

39、拟定 hb1bnh=（1/16 1/18）lnh=（0.150.2）h nb=1.82.3mnb=0.140.18mnb1=(2.03.0)bn马蹄区管道保护层厚度6cmn马蹄面积不宜少于全截面的10%12%bh45SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第47页/共70页（1）纵向预应力筋布置上、下限心点和索界 3.3.3 配筋特点配筋特点 h=(Ny Ny)f

40、tCoNyk上限心点CuNyft下限心点张拉阶段运营阶段抗拉极限强度SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第48页/共70页（1）纵向预应力筋布置上、下限心点和索界 3.3.3 配筋特点配筋特点 上限心点下限心点CoCuMg1M=Mg1+Mg2+MpMg1/NyM/NySCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CH

41、EN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第49页/共70页n 纵向预应力筋的布置 3.3.3 配筋特点配筋特点 n 纵向预应力筋的重心线布置在索界以内，是最常用的形式 n 纵向预应力筋的重心线布置在索界以上，预应力筋的弯起角度较大，可提高梁的抗剪能力，但摩擦引起的预应力损失较大n 直线预应力筋布置，适合先张法施工。预应力筋布置在索界以下，放张时梁端上部容易开裂SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN

42、3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第50页/共70页3.3.3 配筋特点配筋特点 锚固位置局部应力集中，锚具在两端的布置因遵循“分散”“均匀”“对称”的原则并配置一定的加强钢筋，后张法构件张拉力一般较大，还需设钢套筒和钢垫板。n 纵向预应力筋的锚固 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabric

43、ated PC beam bridge 装配式预应力混凝土简支梁桥第51页/共70页3.3.4 构造实例构造实例 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第52页/共70页3.3.4 构造实例构造实例 SCHOOL OF TRANSPORTATION,WUT PRODUCED BY：X J CHEN3.3 design and construct of simpl

44、e-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第53页/共70页武汉理工大学交通学院 制作：陈小佳3.3.4 构造实例构造实例 3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥第54页/共70页武汉理工大学交通学院 制作：陈小佳3.3 design and construct of simple-supported and fabricated PC beam bridge 装配式预应力混凝土简支梁桥3.

45、3.4 construction site A case 构造实例构造实例 第55页/共70页Section 3 design and construct of simple-supported and fabricated beam bridge 装配式简支梁装配式简支梁桥的设计与构造桥的设计与构造1.装配式简支梁桥的构造特点n截面形式n块件划分方式2.装配式钢筋混凝土简支梁桥n截面尺寸拟定、钢筋构造和连接构造3.装配式预应力混凝土简支梁桥n截面尺寸拟定：截面效率指标n预应力配筋构造：索界与纵向预应力配筋n预应力筋的锚固 Review of this section 本节回顾SCHOOL O

46、F TRANSPORTATION,WUT PRODUCED BY：X J CHEN第56页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥和刚构桥 4.1 连续梁桥连续梁桥4.1.1.概述（1）总体布置(0.60.8)ll(1/301/50)l(1/151/20)l 支架施工可取0.8l 悬臂施工可取 0.65l第57页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 截面形式 箱形截面 II单箱单室单箱双室双箱单室第58页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁

47、桥（2）结构构造 截面形式 箱形截面 II垂直腹板形式斜腹板形式第59页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 预应力筋的布置方式 先简支后连续施工支架现浇施工悬臂施工顶推施工第60页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 细部尺寸 IIIIIIl 顶板厚度l 底板厚度l 腹板厚度l 加腋构造顶板厚度腹板厚度底板厚度加腋构造第61页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 细部尺寸 III

48、III顶板厚度两个因素决定：1）横向弯矩2）纵横向布置预应力筋纵向预应力筋横向预应力筋l0.5l0.5ll(m)b1(mm)2.51802003.02002504.0280300b1第62页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 细部尺寸 IIIIIIl 底板厚度跨中支点b2=200250mmb2=(1/101/12)HII-III-Ib2b2H第63页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 细部尺寸 IIIIIIl 腹板厚度 1）布置纵向预应力筋管道的需

49、要 无管道时 200mm 有管道时 250300mm 有锚固头时350mm 2）抗剪的需要 300800mmII-III-Ib3b3H第64页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 细部尺寸 l 加腋构造加腋使得截面的受力得到改善竖加腋水平加腋1）水平加腋对纵向布束有利2)竖加腋可加大腹板的刚度，对改善腹板受力有利2：11：31：12：11：31：12：13第65页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 截面形式 横隔梁设置端 IIIIIIII-III-I

50、端横隔梁人孔端横隔梁第66页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.1 连续梁桥连续梁桥（2）结构构造 截面形式 端横隔梁构造厚度l300500mm 端横隔梁配筋示意第67页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.2 连续刚构桥连续刚构桥（1）力学特点恒载下，与连续梁桥内力基本一致活载下，跨中正弯矩较连续梁桥要小（2）构造特点(0.550.58)ll(1/2.51/3.5)H(1/161/20)l第68页/共70页武汉理工大学交通学院 制作：陈小佳第四节 连续桥梁和刚构桥 4.2 刚构桥刚构桥（3）立面形式 双肢薄壁墩V形墩单