311-247.275.90.170134.8-0.089-70.8⑤活载-23.9-47.3-0.089-70.80.170134.875.9-0.311-247.2内力组合①+②357.6272.7-244.6-71-71-244.6①+③91.67.5-244.6193.2193.2-244.6①+④309.7178-386.1110.6169.5-209.7①+⑤103.330.9-209.7169.5110.6-386.1最不利内力组合项次①+③①+③①+④①+②①+②组合值(kN·m)91.67.5-386.1-71-71-386.1组合项次①+②①+②①+⑤①+③①+③①+④组合值(kN·m)357.6272.7-209.7193.2193.2-209.74、正截面强度计算(1)确定翼缘宽度主梁跨中按T形截面计算边跨:=6.37/3=2.2123m=0.3+5.7=6.0m取=2.2123m中间跨:=6.6/3=2.2m=0.3+5.7=6.0m取=2.2m支座截面仍按矩形截面计算(2)判断截面类型取=640mm(跨中),=610mm(支座)=1.0×9.6×2212.3×80×(640-80/2)=1019.42kN·m>357.6kN·m(193.2kN·m)属于第一类T形截面主梁剪力计算表12项次荷载简图①恒载0.73357.6-1.267-99.561.00078.58②活载0.866104.0-1.134-136.200③活载-0.133-16-0.133-161.000120.1④活载0.68982.7-1.311-157.51.222146.8⑤活载-0.089-10.7-0.089-10.70.77893.4(kN)组合项次①+③①+④①+⑤组合值41.6-257.1172(kN)组合项次①+②①+⑤①+④组合值161.6-110.3225.4
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