Meaning of o,= 08-5f, .8-5b A Xub-1.25Xp Xu=1.25x 0 h-1.25x h-1.25x A h-1.25xb h-1.25x Ey 0,=61E,= 0.8-5f h-1.25xb 0.8-56 裂缝处的钢筋应变偏大
A’ O O’ xu=1.25x h0－1.25x εs εs1 εy xub=1.25xb A y b s h x h x 1.25 1.25 0 1 0 y b y s b s s s E f h x h x E 0.8 0.8 1.25 1.25 0 0 1 y b s f 0.8 0.8 Meaning of 裂缝处的钢筋应变偏大
5 X Os Os y ≤5≤56 h 56≤5≤1.6-56 h f 5-0.8 56-0.8 f 16-5,≤5≤% h y f %5 h y when 5=56 O,=∫ 5=0.8 0,=0
s ' s b s h a 0 ' 2 0 h 'y f b 6 b 1. 0.8 0.8 b y f 'y f 0 1.6 h h b 0 h 0 h h 'y f x fy -fy h -fy 0 h 'y f when b s y f 0 s 0.8
Generalized calculation formulas ∑N,=0 N=aifbx+Aos+A,os ∑M=0 a/ba之+oh-a）=Ne,+-o) or f.bi(-0.5g)+4.o.(-q)-x(c.+2-a
Generalized calculation formulas Ni 0 c As s As s N f bx ' ' 1 Mi 0 ) 2 ) ( ) ( 2 ( 0 ' 0 ' ' 1 0 a h A h a N e x f bx h c s s ) 2 (1 0.5 ) ( ) ( 0 ' 0 2 ' ' 1 0 a h f bh A h a N e c s s or
6.3 Analysis and design of columns (N tension) When h only reinforcement resist N A,0,=∫) A,os=f Only when N is applied on the plastic centriod otherwise o,<f) 成低+分)=么-a N.(3-a-e)-aj4(h-d)
6.3 Analysis and design of columns （N tension) When a h e 2 0 only reinforcement resist N s y f ' As ' ' s y f Only when N is applied on the plastic centriod ' ' s y o f therwise ) ( ) 2 ( ' 0 ' 0 a f A h a h N e u y s ) ( ) 2 ( ' 0 ' ' 0 ' a e A h a h Nu s s As