桥梁工程(姚林森第二版)第2篇第3章

1、第二篇 钢筋混凝土和预应力混凝土简支梁桥 第3章 板桥的设计与构造 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology本章内容 1.1 简支板桥的构造及其特点 Features and form of the simple-supported slab bridge 1.2 斜交板桥的受力特点与构造 Static characteristic and form of the skew bridgeDept of Road & Bridge Engi

2、neering, School of Transportation, Wuhan University of Technology（1) 板桥的截面形式 Section of slab 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1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology知识点：简支板桥的构造及其特点，开始讲解这个知识点 配筋

3、构造 Reinforcement detail a.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%b.分布筋不小于 6 mm25cmc.保护层厚度不小于2cmd.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) 整体式板桥 Cast-in-site slab bridge SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transporta

4、tion, Wuhan University of Technology1.1 简支板桥的构造及其特点 实例 A case P63 标准跨径6m，桥面净宽-7m+2x0.2m,汽车-20级，挂车-100 （2) 整体式板桥 Cast-in-site slab bridge Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology（3）装配式板桥的构造 Construction of the prefabricated slab 我国常用的装配式板桥按截面形式分实

5、心板和空心板两种，我国前交通部颁布的装配式钢筋混凝土实心矩形铰接板桥有标准图。 SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology矩形实心板桥： 标准图实心铰接板实例 P64 SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1.1 简支板桥的构造及其特点Dept of Road

6、 & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology空心矩形板桥：1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of

7、Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transp

8、ortation, Wuhan University of Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 简支板桥的构造及其特点Dept of Road & Bridge

9、 Engineering, School of Transportation, Wuhan University of Technology715.241.1 简支板桥的构造及其特点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology装配式板桥的横向联接 Transverse connection知识点：简支板桥的构造及其特点，讲解结束本章内容 1.1 简支板桥的构造及其特点 Features and form of the simple-supported

10、 slab bridge 1.2 斜交板桥的受力特点与构造 Static characteristic and form of the skew bridgeDept of Road & Bridge Engineering, School of Transportation, Wuhan University of TechnologyDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（1）斜交板桥的适用范围l主要

11、用于小跨度桥梁 Mainlyused in small-span bridgel整体式或装配式斜板桥跨径大部分在20米以下 Span usually under the 20-meter知识点：斜交板桥的受力特点与构造，开始讲解这个知识点Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（2）影响斜板桥受力的因素 Factors which impact skew plate bridge a.斜交角 Chamfer 两种表

12、示方法 Two means 当斜角小于15度时取斜长按正桥计算 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（2）影响斜板桥受力的因素 Factors which impact skew plate bridge b.宽跨比 b/l 宽桥对斜支承敏感 Wide bridge is sensitive to skew supports 窄桥斜支承只影响支承局部 Skew supports of narrow bridge

13、 only impact local partc.支承形式 Form of supports 支承个数 Number of supports 支承方向 Direction of supports 是否弹性支承 The supports are flexible or notDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of skew bridgesa.纵向主弯矩比跨

14、径为斜跨长、宽度为b的矩形板小，并随斜交 角的增大而减小Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of skew bridgesb.荷载有向支承边的最短距离传递分配的趋势 Load has trend to transmit and distribute to the shortest distance between the supportsDept of R

15、oad & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of skew bridgesc.纵向最大弯矩的位置，随斜角的增大从跨中向钝角部位移动 Vertical biggest moment moves from mid-span to obtuse angle while skewed angle increasingDept of Road & Bridge Engineering

16、, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of skew bridgesd.除了斜跨径方向的主弯矩外，在钝角部位的角平分线垂直方向上，将产生接近于跨中弯矩值的相当大的负弯矩 In addition to main moment of ramp-span direction, there is a big negative moment in the direction of vertical direction of obtuse a

17、ngle bisector. e.横向弯矩比正板大得多 Cross moment is much bigger than normal deckDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of skew bridgesf.支承边上的反力很不均匀，钝角角隅处的反力可能比正板大数倍，而锐角处的反力却有所减小，甚至出现负反力 Reaction forces on sup

18、ports is uneven , reaction on obtuse angle cant is much bigger than normal deck while reaction on acute angle reduces ,even negative reaction force happens.Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of sk

19、ew bridgesg.斜板的受力行为可以用Z字形连续梁来比拟 Mechanic behavior is simulated to z-shaped continuous beamDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（3）斜交板桥的受力特点 Force features of skew bridgesh.斜板的扭矩分布很复杂，板边存在较大的扭矩 Distribution of torsion moment is

20、 complex, there is bigger torsion on the side Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（4）斜板桥的钢筋布置及构造特点 Reinforcement distribution and construction features of skew bridges a.桥梁宽度较大时，纵向钢筋，板中央垂直于支承边布置，边缘平行于自由边布置；横向钢筋平行于支承边布置。Dept o

21、f Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（4）斜板桥的钢筋布置及构造特点 Reinforcement distribution and construction features of ramp bridges Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板桥的受力特点与构造（4）斜板桥的钢筋布置及构造特点 Reinforcement distribution and construction features of ramp bridges b.窄斜板桥。纵向钢筋平行于自