文档介绍：螆螅名称羂截面形式羀一个零件的毛结面积A(cm2)膆nA(cm2)蒆零件本身毛截面惯性矩Jxo(cm4)羄零件重心至梁重心的距离a(cm)nAa2(cm4)J=Jxo+nAa2(cm4)腹板Ho(腹板高)*δ1Ho*δ1Jxo1=δ1*h3/12//J1=Jxo1翼板B(翼板宽)*δ22*B*δ2Jxo2=B*δ23/12(Ho+δ2)/2J2=Jxo2+nAa2焊接工字钢的惯性矩ΣJ=J1+J2焊接工字钢的抗弯截面模量W=ΣJ/H/2示例:I400(H)/200(B)-10(翼板)/6(腹板)Jxo1=δ1*h3/12=×383/12==δ1*h3/12nAa2=2×20×13/12+2×20×1×[(38+1)/2]2==Jxo1+Jxo2==ΣJ/H==898cm3