A.35d B.20d C.max(Hn/6,Hc,50) D.max(Hn/6,Hc,500)
A.Hn/3 B.Hn/6 C.max(Hn/6,Hc,500)*2 D.max(Hn/6,Hc,50)
A.max(支座高–Hbc,lae) B.max支座高–Hbc+12d,lae) C.max(支座高–Hbc+12d,0.5labe) D.max(支座高–Hbc,0.5labe)