a1 a2 lc1 lc2 c1 c2 hb lb1 lb2 bc
lx hc lx bc bx bb x
1. 5la 12d 1 ln 1 1 1 3 ln 4 3 ln ln 4 150 212 150 12d 1 ln 1 3 ln 4 12d 150 12d 12d 12d 0. 4la 1 ln 1 3 ln 4 150 1 ln 1 3 ln 4 212 150 1 1 ln ln 3 4 150 15d la 12d 12d 12d ln
1. 5la E 12d 4 2 12d 12d 15d 1 15d 0. 4la E 0. 4la E 3 5d la E 1. A cs 5d 2. la E 3. 0. 65A cs 4., 15d 0. 4la E 15d 5d la E 5d la E
b f h f h w h f
b w, l c/2 400 v v v /2 l c b w 2b f b w 2b f b f b w b f 300 300 v v /2 v v v /2 (a) (b) b f b w 300 lc v h c 2b w /2 v v b w l c b w b f 300 v v /2 v b c2b w 300 l c b f b w 300 l c (c) (d)
b w 300 b w h c b w 400 (a) 300 (b) 300 b c (c)
1. 2 lae 500 1. 2 lae
150 la E 600 la E 600 la E la E 600 600
la E 800 (a) la E la E 800 la E h b 214 (b) h b/3 h b/3 200 200