801B2018( ) () ( )4115010R0R5%20 1 200mm22300mm23 400 mm2Fp=30kN =30o220 No.28a P No.28az Iz=7114.14cm4Wz=508.15cm3Szmax=288.96cm3b=8.5mm1 a b2 =160MPa 3 =80MPa20 D=40mm =2mmFp=40kNE=70GPa =0.35 E1=210GPa325 CD D F = 10 kNAB CD CAB 45mmD 36mmdA3 200GPaE 200MPaP1 2stn AB2 60MPa25 AB1.5kNtF 700NrF 600NxF =100MPa d425G33GlEIdla E
