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1、20m簡支梁橋計(jì)算書1、毛截面幾何特性計(jì)算1.1基本資料1.1.1主要技術(shù)指標(biāo)橋跨布置:1020.0m，橋梁全長206.04m?？鐝?標(biāo)準(zhǔn)跨徑：計(jì)算跨徑：。橋面總寬:15.0m，橫向布置為0.5m（防撞護(hù)欄）+14.0m（行車道）+0.5m（防撞護(hù)欄。）設(shè)計(jì)荷載：公路-Ⅱ級1.1.2材料規(guī)格預(yù)應(yīng)力鋼筋鋼絞線，直徑mm;非預(yù)應(yīng)力鋼筋采用;空心板塊混凝土采用C40;橋面鋪裝采用C40防水混凝土。1.2截面幾何尺寸圖1.2.1橋面橫斷面布置圖圖1.1橫斷面圖1.2.2板塊結(jié)構(gòu)幾何尺寸(a)中板跨中截面(b)中板支點(diǎn)截面(c)邊板跨中截面(d)邊板支點(diǎn)截面圖1.2截面幾何尺寸圖1.3毛截面幾何特性計(jì)
2、算本設(shè)計(jì)預(yù)制空心板的毛截面幾何特性采用分塊面積累加法計(jì)算，先按長和寬分別為板輪廓的長和寬的巨型計(jì)算，然后與圖2.2中所示的挖空面積疊加，疊加時(shí)挖空部分按負(fù)面積計(jì)算，最后再用AutoCAD計(jì)算校核。表1-1毛截面幾何特性計(jì)算結(jié)果截面位置中板跨中截面邊板跨中截面中板支點(diǎn)截面邊板支點(diǎn)截面截面形式面積0.622900.765900.675800.79235抗彎慣矩0.057060.072650.061250.07404抗扭慣矩0.112860.122430.125370.12883形心X值0.620000.776070.620000.75127形心Y值0.429170.495160.450000.5
3、0184計(jì)算參數(shù)D0.104340.091740.107200.094162、內(nèi)力計(jì)算及組合2.1永久作用效應(yīng)計(jì)算2.1.1空心板自重（第一階段結(jié)構(gòu)自重）(kN/m)2.1.2橋面系自重（第二階段結(jié)構(gòu)自重）橋面鋪裝采用等厚度的18cm的C40混凝土,則全橋?qū)掍佈b每延米重力為:(kN/m)為計(jì)算方便近似按各板平均分擔(dān)來考慮,則每塊空心板分?jǐn)偟降拿垦用讟蛎嫦抵亓?(kN/m)2.1.3鉸縫自重（第二階段結(jié)構(gòu)自重）因?yàn)殂q縫自重可以近似看成C40混凝土來算,因此其自重為:由此得空心板每延米總重力為：(kN/m)（第一階段結(jié)構(gòu)自重）(kN/m)（第二階段結(jié)構(gòu)自重）(kN/m)由此可計(jì)算出簡支空心板的
4、恒載(自重效應(yīng)),計(jì)算結(jié)果見表2-1。表2-1永久作用效應(yīng)匯總表項(xiàng)目作用種類作用gi(kN/m)計(jì)算跨徑(m)作用效應(yīng)(kN/m)作用效應(yīng)(kN)跨中()1/4跨()支點(diǎn)()1/4跨()跨中19.14819.30891.53668.65184.7792.3907.02219.30326.95245.2267.7633.88026.17019.301218.48913.87252.53126.2702.2可變作用效應(yīng)計(jì)算本橋汽車荷載采用公路—Ⅱ級荷載，它由車道荷載組成?！稑蛞?guī)》規(guī)定橋梁結(jié)構(gòu)整體計(jì)算采用車道荷載。2.2.1汽車荷載橫向分布系數(shù)計(jì)算根據(jù)截面幾何尺寸特點(diǎn),利用《橋梁結(jié)構(gòu)電算程序設(shè)計(jì)》
5、,得出各板的橫向分配影響線豎標(biāo)值見表2-2。表2-2各板的橫向分配影響線豎標(biāo)值表荷載作用板號節(jié)點(diǎn)號1#2#3#4#5#6#10.27470.15190.12150.09760.07880.064220.24870.15740.12590.10110.08160.066530.22280.16280.13020.10460.08440.068840.20040.15700.13620.10940.08830.071950.17800.15120.14220.11420.09220.075160.16030.13620.13870.12200.09850.080270.14260.12120.1
6、3520.12980.10480.085480.12870.10940.12200.12780.11390.092890.11480.09750.10880.12580.12300.1002100.10390.08830.09850.11390.12210.1103110.09300.07910.08820.10200.12120.1203續(xù)表2-2荷載作用板號節(jié)點(diǎn)號1#2#3#4#5#6#120.08460.07190.08020.09280.11030.1203130.07620.06480.07230.08360.09930.1203140.06990.05940.06620.0766
7、0.09100.1103150.06350.05400.06020.06960.08270.1002160.05880.05000.05570.06440.07660.0928170.05410.04600.05130.05930.07050.0854180.05080.04320.04820.05570.06620.0802190.04760.04040.04510.05220.06200.0751200.
