qk?66KN/mq?91.2KN/m
Fk?66?6?396KNF?91.2?6?547.2KN5V??547.2?1368KN 2M?1368?9?547.2?(6?3)?7387.2KN?mMx7387.2?106Wx???23849?103mm3rxf1.05?295（1）试选截面：
fl2295hmin????400?18000661.34?10[VT]1.34?10?1585mmhe?2Wx0.4?2?(23849?103)0.4?1786mm取梁腹板高h0?1700mm1368?103tw?1.2?1.2??5.7mmhofV1700?170tw?h0/3.5?11.8mm取tw?12mmWxtwh023849?10312?1700翼缘Af?????10629mmh0617006bf?h5~h3Vmax?17005~17003?(340~567)mm取bf?500mm则tf?10629500?21.2mm取tf?24mm（2）强度验算：
17001700sx?(?12??500?24?862)?1.468?107mm3241Ix?(500?17483?488?17003)?2.27?1010mm41210Wx?Ixh2?2.27?10874?2.597?107mm3A?500?24?2?1700?12?44400mm2Mx7387.2?106????270.9Mpa?f?295mMpa7rxWx1.05?2.597?10Vmaxs1368?103?1.468?107????73.7Mpa?fv?170Mpa10Ix?tw2.27?10?12（3）整稳验算：hb1?3000/500?6?16不需验算. （4）刚度验算：
（5）翼缘和腹板的连接焊缝计算： （6）主梁加劲肋设计
5?Fk5?396??110kNm18185qkl45110?(18000)4l18000v?????32mm?[v]???45mm510384EIx3842.06?10?2.27?10400400qk?Vs11368?103?(500?24?862)hf???2.2mmw101.4Ixff1.4?2.27?10?200取hf?8mm?1.5tmax?1.524?7.3mmh0/tw?1700/12?142,80?142?170,宜设置横向加劲肋?2?c?2()+?()?1?cr?c,cr?cr间距a?0.5h0?0.5?1700?850mm?2h0?2?1700?3400mm取a?3000mm,设在集中荷载作用处.I区格:vI?1368KN
MI?1368?1.5?2052KN?mmMIh02052?1061700???????76.8Mpa7Wxh2.597?1017481368?103?I???67.1Mpah0tw1700?12II区格:V?I?820.8KNMI??1368?4.5?547.2?1.5?5335.2MI?h05335.2?I????76.8??199.68MPaWxh2052 820?8?103?I???40.24MPa1700?12Ⅲ区格：V????273.6KN
VI
M????1368?7.5?547.2?(4.5?1.5)?6976.8kN?m?????76.8?????6976.8?261.12MPa2052273.6?103??13.41MPa1700?12
计算?cr ?crh0tw1700fy34512?b=????0.97177235177234 0.85??b?1.25?cr?[1?0.75(?b?0.85)]f?[1?0.75(0.97?0.85)]?295?268.45MPaah0?30001700?1.77?1.0h0tw170012fy?s???2h0235415.34?4(a)22415.34?4(17002)3000?345?1.627?1.2235?cr?1.1fv??1.1?1701.627?70.6MPasⅠ区格：(76.8267.12)?()?0.082?0.903?0.985?1
268.4570.6Ⅱ区格：(199.68240.242)?()?0.553?0.325?0.878?1
268.4570.6261.12213.412)?()?0.946?0.036?0.985?1
268.4570.6Ⅲ区格：(横向加劲助尺寸：
h01700?40??40?97mm,取140mm3030b140ts?s??9.3mm取10mm 15151140122Iz??10?1403?140?10?(?)1222?10.4?106mm4?3h0tw3?3?1700?123?8.8?106mm4bs?中部支承加劲助：
N=1368+547.2-70.6?1700?12?475.2kN1000A?2?140?10?360?12?7120mm21?10?(140?2?12)3?2.07?107mm412Izi2??53.9mmA?2?170053.9?32??2?0.929Iz?N475.2?103??71.8MPa?f?295MPa?2A0.929?7120支座支承加劲助验算:547.2?1641.6kN2采用180?16板N?1368?A?2?180?16?(180?100)?12?9120mm2Iz?1?16?(180?2?12)3?6.86?107mm412Iz?A6.86?107I2??86.79120?2?170086.7?20??2?0.970N1641.6?103??185.6MPa?f?295MPa?A0.970?9120
?ce1641.6?103??366.4MPa?fce?400MPa2(180?40)?161641.6?103hf??1.8mm,用6mm?1.516?6mm4?0.7?(1700?2?50)?200