B YES NO 5 7 6 1 4 3 2 BB BB BB AA AA BB 510J
B
B A 510J
B A A A A A A 510J
B A 510J
B A A A A A 510J
M = σ Z Z = M σ AAA π T T = a ZP ZP = a AAA π B
M + M 2 +T 2 M T Me = = 1 + 1 + 2 2 M σ Te = M 2 +T 2 = M 1 + T M 2 2 θ = 57.3 T L G IP θl l AAA θ B
B A A A l δ i l δ l i i l l δ l δ l i i l δ i δ l i l l δ δ l i 510J
l δ i δ l l i i l δ i δ l l i i δ l i l δ i δ l l i l i δ l l i i l δ δ l i l i i B
60λ 2 E 10 3 I Nc = 2 0.8 2π lb γ A l π A g π A B
L = ft fc CT fw TC 3 50 L = ft fc C 3 fw PC 50 B B B B
PE = PC+ 4 TC 10 3 i dp cosα i α α i i i i α α A i i Pu = K M AAA Lh = L 10 3 2 ls n1 60 l B
B 510J
3 n 1 3 Pm = (Pn Ln) L n=1 3 1 3 3 3 Pm = (P1 L1 + P2 L2 + Pn Ln) L B
Pm 1 3 (Pmin + 2 Pmax) Pm 0.65Pmax Pm 0.75Pmax B
A AA g l B A B
l l B B B α α B B
B B B g g g g ll l l l l l B
M1 = mn 9.8 1 a ln g M2 = mn 9.8 ln M3 = mn 9.8 1 a ln g g g l g g lllll lllll lllll lllll lllll B
lllll ll ll ll ll ll ll B
Pn = Mn K A B B B B B B