FyI coso+ Fy2=m(uar to →F1+F2≈m(On+U) yI COSd L2Fy2 =la LFy1-12Fy2≈12On YI 6/24
6/24 L L2 L1 2 1 r u2 u V x y 2 FY 2 FY1 u1
0+lo B=-,5 C1=-(-5)=B+ LOr=s 2 U-120n=B Fyi=ka Fy =h2a 724
7/24 u L u L u L u L u r r r r 2 2 2 1 1 1 ( ) , = − − = = − − = + − + = = 1 1 1 2 2 2 F k F k Y = Y =
k,,+k 202=m(0n+b LLK,a,-L2k2a2=120 a1=-(-5)=B+ 将 代入,则 O B ∑ k1+k2)+(Lk-12)0一k=m(+0) ∑ L1k1-L2k2)+(12k1-12k2)-L1k16=10n 8/24
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