箱梁橋面板計(jì)算

1、百度文庫讓每個(gè)人平等地捉升口我3#50 1001503540035連續(xù)梁橋跨徑布宜為70+100+70 (in),主跨分別在梁端及跨中設(shè)橫隔板，板厚40cm,雙車道設(shè)計(jì)，人行道寬。橋而鋪裝層容重23kN/m人行道構(gòu)件容重24kN/m主梁容 重 25 kN! nr 求：1、懸臂板最小負(fù)彎矩及最大剪力；2、中間板跨中最大正彎矩、支點(diǎn)最小負(fù)彎矩、支點(diǎn)最大剪力。 解：一、懸臂板內(nèi)力計(jì)算g 人=0.2 x 1 x 24 = 4.8kN/mg板=x j x 25 = 1.5kN/ mg 汕=0.1 x 1 x 23 = 2.3kN/inqr = 2.75 x 1 = 2.15kN/in1、懸臂根部最小負(fù)彎

2、矩計(jì)算 結(jié)構(gòu)自重產(chǎn)生的懸臂根部彎矩:1 52 5=-4.8 x 1.5 x (3 0.75) + 2.3 x 1.5 x + 7.5 x 2.5 x = -42.2kN m2 2人群荷載產(chǎn)生的懸臂根部彎矩:M 對=-2.75 x 1.5x (3 0.75) = 93kNni 汽車荷載產(chǎn)生的懸臂根部彎矩：aA = 4 + 2H = 0.2 + 2x0.1 = 0.4/n=6 + 2H = 0.6 + 2x0.1 = 0.8/ha = a +2bf = 0.4 +2x(1.50.1) = 3.2m 1 Am有重疊。單個(gè)車輪作用下板的有效工作寬度：故：a = 3.2 + 1.4 = 4.6/?P 1

3、40/?=3SkN/mab 4.6 x 0.8M .,7 = -1.3x38 x0.8x 1 = 395kNm內(nèi)力組合：基本組合：Mud = 1.2 x (-42.2) +1.4 x (-39.5) + 0.8 x 1.4 x (-9.3) = -116 AkN - m 短期效應(yīng)組合：M切=-42.2 + 0.7 x (-39.5) -1.3 +1.0x (-9.3) = -12.SkN- m2、懸臂根部最大剪力計(jì)算結(jié)構(gòu)自重產(chǎn)生的懸臂根部剪力：Q 心=4.8 x 1.5 + 2.3 xl.5 + 7.5x 2.5 = 29 AkN人群荷載產(chǎn)生的懸臂根部剪力：Q& =2.75x1.5 = 4.1

4、汽車荷載產(chǎn)生的懸臂根部剪力：0 勿=1.3x38x0.8 = 39.5內(nèi)力組合：基本組合：Qlld =1.2x29.4 + 1.4x39.5 + 0.8x1.4x4.1 =95.2短期效應(yīng)組合：Qxd = 29.4 + 0.7 x 39.5-1.3 + 1.0x4.1 = 54.8?/二、中間橋面板內(nèi)力訃算/50- = 2故按單向板計(jì)算內(nèi)力h 4把承托而積平攤到橋面板上:廠=02 +0.6 x 0.24=0237g 訕=2.3kN/ing 板=0.23 x 1 x 25 = 5.SkN / m1、跨中彎矩計(jì)算：I = lQ+t = 4 + 0.2 = 4.2m l0 + b = 4.35 m單

5、個(gè)車輪作用下板的有效工作寬度：I4.22a = a + = 0.4 + =1.8/rz 1 Am 3332/故：a =d = 2.8m + 1.4 = 4.2mg = 23 + 58 = 8N/?有重疊a = q + f = 0.4 + 0.2 = 0.6/7/ 無重疊百度文庫讓每個(gè)人平等地捉升口我PiPs“6ab2x0.8p 140 ab、4x0.8p 140abx4.2 x 0.8P-I40 _pPy=41 HkN ImPa43 8kN/mabx 3x0.8140= S7.5kN/m5S3kN/m2ab亍而皿5叫”4x8.1x4,217,.M伴=1.3 x 丄 x (145.8 - 87.

6、5) x0.7x0.117 +2 88x0.7x0.175 + 41.7x0.4x0.95x2+ x (62.5 58.3) x 0.8 x 0.333 +58.3x0.8x0.4 = 64.RAT-mM() = 1.2x17.9 + 1.4x64.1 = 111.2-wzr 20113WT?54M 屮=0.5x111 2 = 556kNmM =-0.7xlll.2 = -77.8/n2、支點(diǎn)剪力計(jì)算：/42a = cl + - = 0.4 + = 1 7？ 1 Am3 332/故：a d = 4. In?3 a = 0.6/7? Q 處=1x8.1x4 = 16.2Q 切=1.3x -x(145.8 - 79.5) xO.8x 0.933 + 79.5 x 0.8 x 0.9 +2-X (54.7 - 42.7) X 0.45 x 0.638 + 42.7 x0.8x 0.575 + 1x(109.4 一 72.9) x 0.8 x 0.092 + 2 272.9 x 0.8 x 0.12