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2{20

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l - d\~+ 1'0-\ _d.!oQ'C.' ~ I)' I I"

--'- v- '(- " " 2 I I IIII 1~w=

defines .rl' plane

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13M ]M + x / [ x ax dx dy

x

Mrdy

aQr)Q + -' dx dy ( _\ (7xy /

r7M,)M. + -.~\'\ dy dr( ." dl'

Figure Free-body forces involved in rotation about y-axis. (Forces involved in rotation about the x-axis not shown.)

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bulent akbasRectangle

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~c.r =- k. ~ E 12 ( ~ _ ~ 2. ) ( b( -t )20

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Figure

fixed fixed

B\ I A\ fixed s.s. I II S.S. fixed I\IU I I II \

II \:\ -\ II \ I \ I \ \ \ \ \ \ \ " \ \ --, I

D free

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HIgh bit !p R;g;d st,a;ght

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s(Zz.

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5.2. Effect of Premature Local Buckling on Overall Column Strength

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CO~ oos;~;:,~ 'P y1 I = t:y.yy ~L;-~ / J; S

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E2~b.-

EXAMPL 2 :------------ /\X.

c.~s '-/::::::b,4-"""""

... , 'V T Ar (ke.( ~d-((~ )

b", = >/ '12/- [4 _ 0 3~ / ~: J !::: ~ I tc (t- 13 00+ ~) of=. f (b Jt: ) f

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~ ~k-L.) = 41.62. t!-. GILL ) ~ = 4-7.5~+~ r r1'(-. ~-b.:.(.s

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1Eb ~ 1.Cf1..{7; r1 _ o~_.;e-'] ;::- 3',62- t.. ~ - 4-4t: 34.5\ l 4~ V~ -t

'2.f+e~ =' A,3 - 2 ( b.l _ ~ ) t'l = 4-~ b ""''''''' t t

Q< '=- Aeu -=: _ .....,-~--}' =090 A3 5~d.o

3) ~~ of Co~ ~ ~ 4'1-.5 4-,~1 VIF; =- ~Aq,5 7

G.o/- '\Fc.r-= (o.6~8 ~) Q'h; =2%:t,~4 MPq (~= 1i~ =~SM~)&:Llr)L

4) tP eo P ~ p~Yl D,~t=c..r Aj .=. p~ ~ () ,~(), (1~~_b4) 554-0 = 1, 4- fS p

P- :'1 DrL ldJ LL12-FD )

p" ~ f'a. A.b1

2.b.1- 64-( p _8~t) ~)h:r~ = P ~ --

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