第22次作业: 2-2 屈服荷载:FN1=0,AF2= ,F=(F1×3+F2×1)=1a,A 极限荷载:FM1=,,F2=,A,F=(FN1×3+F2×1)=2o,A T=20, mdr 129.04kN 空心:T=可2m2 丌O 12(08-d=187KNm 第23次作业 5F M.=2×0. ×30=50.76kNm F 3M 30.5kN
第 22 次作业: 2-2 ( ) F A F A F (F F ) A F F F A A F A F N s N s s N N s s N N s s N s N 3 1 2 2 1 , , 3 5 3 1 2 1 , 3 , 1 2 1 2 1 2 1 2 = = = + = = = = + = 极限荷载: 屈服荷载: 2-4 T r dr (D d ) k N m k N m d T r dr s D u d s s d u s 18.7 . 12 2 9.04 . 12 2 2 0 2 0 2 2 2 3 2 0 2 0 0 = = − = = = = 空心: 实心: 第 23 次作业: 2-8 k N M F M k N m F M u u u s 30.5 5 3 30 50.76 . 2 60 120 2 3 5 max = = = = =