.6×72.485+8.335/2=126.838mm处?扣除失效板件,计算可知 Wex1=57.913cm3 Wex2=57.913cm3 Wey1=44.136cm3 Wey2=44.136cm3 Ae=11.755cm2?考虑净截面折减: Wnx=56.754cm3 Wny=43.253cm3 An=11.52cm2 σ1=11.92/56.754×103-(0.09117)/43.253×103=207.925N/mm2 σ2=11.92/56.754×103+(0.09117)/43.253×103=212.14N/mm2 σ3=-(11.92)/56.754×103-(0.09117)/43.253×103=-212.14N/mm2 σ4=-(11.92)/56.754×103+(0.09117)/43.253×103=-207.925N/mm2?212.14≤215,合格!五.2轴受剪强度验算?最不利工况为:1.2D+1.4W2?最不利截面位于首端?剪力:V=-5.127kN?τy=3×-5126.756/2/(160-2×2)/2=-24.648N/mm2?24.648≤125,合格!六.3轴受剪强度验算?最不利工况为:1.35D?最不利截面位于,离开首端2325mm?剪力:V=0.3718kN?τx=3×371.837/4/(120-2)/2=1.182N/mm2?1.182≤125,合格!七.2轴挠度验算?最不利工况为:D+W2?最不利截面位于,离开首端4650mm?挠度限值为:9300/100=93mm?挠度为:75.46mm?75.46≤93,合格!八.2轴长细比验算?2轴长细比为:2325/47.233=49.224?49.224≤200,合格!九.3轴长细比验算?3轴长细比为:9300/62.984=147.657?147.657≤200,合格!
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