橋梁工程PPT(姚林森第二版)第2篇第3章

1、第二篇 鋼筋混凝土和預(yù)應(yīng)力混凝土簡(jiǎn)支梁橋 第3章 板橋的設(shè)計(jì)與構(gòu)造 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology本章內(nèi)容 1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn) Features and form of the simple-supported slab bridge 1.2 斜交板橋的受力特點(diǎn)與構(gòu)造 Static characteristic and form of the skew bridgeDept of Road & Bridge Engi

2、neering, School of Transportation, Wuhan University of Technology（1) 板橋的截面形式 Section of slab Solid實(shí)心板Irregular shape 異形板Integral 整體式Assemble 裝配式Solid實(shí)心板Hollow 空心板1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology知識(shí)點(diǎn)：簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)，開始講解這個(gè)知識(shí)點(diǎn) 配筋

3、構(gòu)造 Reinforcement detail a.主筋不小于 12mm720cm 且兩側(cè)邊緣板帶的主鋼筋數(shù)量，宜較中間2/3板寬范圍內(nèi)板帶增加15%b.分布筋不小于 6 mm25cmc.保護(hù)層厚度不小于2cmd.深入支點(diǎn)的主筋總量不少于跨中主筋總量的1/4，且間距不少于每米3根 （2) 整體式板橋 Cast-in-site slab bridge SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transporta

4、tion, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn) 實(shí)例 A case P63 標(biāo)準(zhǔn)跨徑6m，橋面凈寬-7m+2x0.2m,汽車-20級(jí)，掛車-100 （2) 整體式板橋 Cast-in-site slab bridge Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology（3）裝配式板橋的構(gòu)造 Construction of the prefabricated slab 我國(guó)常用的裝配式板橋按截面形式分實(shí)

5、心板和空心板兩種，我國(guó)前交通部頒布的裝配式鋼筋混凝土實(shí)心矩形鉸接板橋有標(biāo)準(zhǔn)圖。 SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology矩形實(shí)心板橋： 標(biāo)準(zhǔn)圖實(shí)心鉸接板實(shí)例 P64 SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road

6、 & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology空心矩形板橋：1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of

7、Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transp

8、ortation, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge

9、 Engineering, School of Transportation, Wuhan University of Technology715.241.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology裝配式板橋的橫向聯(lián)接 Transverse connection知識(shí)點(diǎn)：簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn)，講解結(jié)束本章內(nèi)容 1.1 簡(jiǎn)支板橋的構(gòu)造及其特點(diǎn) Features and form of the simple-supported

10、 slab bridge 1.2 斜交板橋的受力特點(diǎn)與構(gòu)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 斜交板橋的受力特點(diǎn)與構(gòu)造（1）斜交板橋的適用范圍l主要

11、用于小跨度橋梁 Mainlyused in small-span bridgel整體式或裝配式斜板橋跨徑大部分在20米以下 Span usually under the 20-meter知識(shí)點(diǎn)：斜交板橋的受力特點(diǎn)與構(gòu)造，開始講解這個(gè)知識(shí)點(diǎn)Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（2）影響斜板橋受力的因素 Factors which impact skew plate bridge a.斜交角 Chamfer 兩種表

12、示方法 Two means 當(dāng)斜角小于15度時(shí)取斜長(zhǎng)按正橋計(jì)算 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（2）影響斜板橋受力的因素 Factors which impact skew plate bridge b.寬跨比 b/l 寬橋?qū)π敝С忻舾?Wide bridge is sensitive to skew supports 窄橋斜支承只影響支承局部 Skew supports of narrow bridge

13、 only impact local partc.支承形式 Form of supports 支承個(gè)數(shù) Number of supports 支承方向 Direction of supports 是否彈性支承 The supports are flexible or notDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of skew bridgesa.縱向主彎矩比跨

14、徑為斜跨長(zhǎng)、寬度為b的矩形板小，并隨斜交 角的增大而減小Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of skew bridgesb.荷載有向支承邊的最短距離傳遞分配的趨勢(shì) 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 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of skew bridgesc.縱向最大彎矩的位置，隨斜角的增大從跨中向鈍角部位移動(dòng) 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 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of skew bridgesd.除了斜跨徑方向的主彎矩外，在鈍角部位的角平分線垂直方向上，將產(chǎn)生接近于跨中彎矩值的相當(dāng)大的負(fù)彎矩 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.橫向彎矩比正板大得多 Cross moment is much bigger than normal deckDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of skew bridgesf.支承邊上的反力很不均勻，鈍角角隅處的反力可能比正板大數(shù)倍，而銳角處的反力卻有所減小，甚至出現(xiàn)負(fù)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 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of sk

19、ew bridgesg.斜板的受力行為可以用Z字形連續(xù)梁來比擬 Mechanic behavior is simulated to z-shaped continuous beamDept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（3）斜交板橋的受力特點(diǎn) Force features of skew bridgesh.斜板的扭矩分布很復(fù)雜，板邊存在較大的扭矩 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 斜交板橋的受力特點(diǎn)與構(gòu)造（4）斜板橋的鋼筋布置及構(gòu)造特點(diǎn) Reinforcement distribution and construction features of skew bridges a.橋梁寬度較大時(shí)，縱向鋼筋，板中央垂直于支承邊布置，邊緣平行于自由邊布置；橫向鋼筋平行于支承邊布置。Dept o

21、f Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（4）斜板橋的鋼筋布置及構(gòu)造特點(diǎn) Reinforcement distribution and construction features of ramp bridges Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology1.2 斜交板橋的受力特點(diǎn)與構(gòu)造（4）斜板橋的鋼筋布置及構(gòu)造特點(diǎn) Reinforcement distribution and construction features of ramp bridges b.窄斜板橋?？v向鋼筋平行于自