某桥m横向分布计算

横向分布计算米水一桥（K31+200.5）一、50mT梁左半幅，基本资料：左半幅桥宽20.5m，桥面宽20.25m.T梁组成：1.375m+72.5m+1.375m（8片梁）.求主梁截面竖向抗弯惯性矩I.近似取翼板平均厚度为0.28m，求截面形心位置距梁底的距离以及抗弯惯性矩I.截面竖向抗弯惯性矩：2.求主梁截面抗扭惯性矩.将T梁划分为2.120.2m的梁肋部分、桥面宽20m0.28m的桥面板及马蹄部分，然后将其相加.（c值按《公路桥梁荷载横向分布计算》第二版查表得）桥面板：,故取c=1/3梁肋：，故取c=1/3马蹄：，故取c=0.2093.求内横梁截面和等刚度桥面板抗弯惯矩内横梁翼板宽度取内横梁间距7m，翼板厚取桥面板靠主梁肋d/3处板厚0.2967m作为翼板厚度，腹板厚取0.2m，腹板高2.12m.截面形心距梁底的距离为,内横梁截面抗弯惯性矩：等刚度桥面板抗弯惯性矩：]4.主梁抗弯与抗扭刚度比例参数和主梁与桥面板抗弯刚度比例参数.5.桥梁横向分布系数计算查刚接板、梁桥荷载横向分布影响线表（《公路桥梁荷载横向分布计算》）第二版.梁号η1η2η3η4η5η6η7η81#395318241164869-68-1052#3182632081539742-13-683#16415314213111910897861#梁：两列车：mq=(406.55+351.1+311.07+255.63)/2/1000=0.6622三列车：mq=(406.55+351.1+311.07+255.63+215.59+160.1)0.78/2/1000=0.663四列车：mq=(406.55+351.1+311.07+255.63+215.59+160.1+119.54+63.97)0.67/2/1000=0.63092#梁：两列车：mq=(326.25 +286.65+258.05+218.45)/2/1000=0.5447三列车：mq=(326.25+286.65+258.05+218.45+ 189.85+ 150.2)0.78/2/1000=0.5575四列车：mq=（326.25+286.65+258.05+218.45+189.85+150.2+121.08+81.05）0.67/2/1000=0.5466五列车：mq=（326.25+286.65+258.05+218.45+189.85+150.2+121.08+81.05+52.45+12.85)0.6/2/1000=0.50914#梁：两列车：mq=(165.65+157.73+152.01+144.09)/2/1000=0.3097三列车：mq=(165.65+157.73+152.01+144.09+138.37+130.4)0.78/2/1000=0.3464四列车：mq=(165.65+157.73+152.01+144.09+138.37+130.4+124.16+115.81)0.67/2/1000=0.3780五列车：mq=(165.65+157.73+152.01+144.09+138.37+130.4+124.16+115.81+110.09+102.17)0.6/2/1000=0.4021六列车：mq=(165.65+157.73+152.01+144.09+138.37+130.4+124.16+115.81+110.09+102.17+96.45+88.530.55/2/1000=0.4195故取边梁：mq=0.663中梁：mq=0.5575二、右半幅(5梁式)求主梁跨中荷载横向分布系数：查表得：梁号η1η2η3η4η51#531366200341312#366283200117343#2002002002002001#梁：两列车：mq=(555.75+436.95+351.06+231.54)/2/1000=0.7877三列车：mq=(555.75+436.95+351.06+231.54+145.22+25.75)0.78/2/1000=0.68102#梁：两列车：mq=（378.45+318.69+275.53 +215.77）/2/1000=0.5942三列车：mq=(378.45+318.69+275.53+215.77+172.61+112.85)0.78/2/1000=0.57483#梁：两列车：mq=（2004）/2/1000=0.4三列车：mq=(2006)0.78/2/1000=0.468故取边梁：mq=0.7877中梁：mq=0.5942K43+426江田米水大桥三、右半幅(6梁式)求主梁跨中荷载横向分布系数：查表得：梁号η1η2η3η4η5η61#479354229104-21-1462#35427920412954-213#229204179154129104eq\o\ac(○,1)车辆布载从左至右：汽车人行汽车人行1#梁：两列车：mq=(385.25+295.25+230.25+140.25)/2/1000=0.5255三列车：mq=(385.25+295.25+230.25+140.25+75.25-14.75)0.78/2/1000=0.4335人行：mr=0.4352#梁：两列车：mq=（297.75+243.75+204.75 +150.75）/2/1000=0.457三列车：mq=(297.75+243.75+204.75+150.75+111.75+57.75)0.78/2/1000=0.4159人行：mr=0.3283#梁：两列车：mq=（210.25+192.25+179.25+161.25）/2/1000=0.3715三列车：mq=(210.25+192.25+179.25+161.25+148.25+130.25)0.78/2/1000=0.3984人行：mr=0.220eq\o\ac(○,2)车辆布载从右至左：汽车人行汽车人行1#梁：两列车：mq=(485.25+395.25+330.25+240.25)/2/1000=0.7255三列车：mq=(485.25+395.25+330.25+240.25+175.25+85.25)0.78/2/1000=0.6675人行：mr=02#梁：两列车：mq=（357.75+303.75+264.75+210.75）/2/1000=0.5685三列车：mq=(357.75+303.75+264.75+210.75+171.75+117.75)0.78/2/1000=0.5563人行：mr=03#梁：两列车：mq=（230.25+212.25+199.25+181.25）/2/1000