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68 (1997 13 I . of by of . z ,*, , R. b o/gv Vm5. 02r.a,. P, h d 75 I , I.:K c;41. . 1096 ,&,. t1 995 he of as a of is a to of at of to be of E of of it is do of of of of be if of of , 1997 . In is as a or as of In is to of to to In to a is to of of of of of of a of 1,2. in is H v of be as in * + 351 I 8474045. 09247/$ 1997 09246)02517-4 to be It is to a I(a), A 3 is on of l(b) a of is of 4, I I I i I L i ,;i p I I I I I (a) (b) 1. of a (a) a of an 14 K. et 8 (1997) 13 5; , t J 1 . I, x/k ,0 o9 f 0 2-(e) ju/5) 08 - i. - 0. is a if 6 H in o, ; f o, o., 6/7= g6 ; (6) - 02 o.z .1 p/Go 5. ! 2 3 , 5 2. as a of 71. of of a to to of cf a is 2. of he of -D at is on of (I) F In is is Tj is SF is on is as t 12 0 = t j (2) = (23 eoe) ;2 (3) a v. is a H / = 0. of , = 0 (4) b is In to of in 6. of is is by 3, in is to ao in is by C(g) (8) n g is g = ( ee,/) 12 (9 in e e is 7 to r is r =j- k (10) in f is is k is of k = (l l) , p, at p/3 z/k = f a is to f (2). In to of at : . t (12) /r in j is in to us of to vo is a in 61. is 8. of 9. K. tt g (19971 5 ,1 ! 1+/ i _. _,_= . .=-:. _ -_-:. a) p/ / 3 ,;- t ! ,. ,/ . o I . , -. - _ - ._=,. B (b) 3. a b) a :of p r . / . : 1:) . ,j o (a) x N i) o :; - 0 30 4, 50 0 , 01- - I - (b) , +4. (a) of ; b) n(e)Bo 10 ,:B, = 3. he to (i) (on to to is (to 740() (13) (of is by o/Bo in o is of B0 is of fl is 1). (v) e - 100% (14) Ho is to in of is at (o = f= 0,5, . 16 K. et 8 (1997) 13,S 7- f= _11 11 /I , f=,.I . 1 O: (b) (a) ! 0.2 z 0. - i 17 . r I f 5. (a) of ; b) (J)/Bo e = 20%, # = 10 o/ , / t.;/= X N . 0 0 0 i i i 10 (a) (b) 6. (a) of ; b) N(B o e = 20/,. 0 o/ 4. he of by 3, of (i) is (A of of (N, at no to is of (A is at of of is a of e, f, o/4(a) f=10 o/-N of of -R to of a of N/Bo of 4(b), r/Bo of . et 68 (1997) 137 to of is 4(a). of e = 20%, 10 o/ 0.5 5 (i) of on f= 0 at an of f= 1.0 of is FH, c 2s 0 2 0 05- X - s (a) 0 C 25 02 0:5 01 0 05 0 . -. . o,- S e=20% 30% 40% 50% J - 15 50 0 x c (b) o ,o C %1 25 - 2- ._.- t=-o o - 050 + I I o 20 (c) = ,o e%l 025 . .#./ O=0 25 005 - .0 o ,o e%1 0 2o (d) 0 7. ,/Fv as a of (v)(of e = o = (b) ( f= o = (c) (of f 10 o = (d) (v)(e) o/8o = 10 , f= (a on of (,(/S)/B, e, f o/Bu is 6(b). A is to in (is to of it of of be in fl of of F. ;=vl (151 v)(of e, f o,Bo is 7(a), it be H:Fv on of e. In H = (16 as i of to he v)(e) fl f o/7(b) 7(c) (d) a o/Bo be If it is H/Fv of of v)(e o/ 7(d) re a un at of o to e 8. On 8(b), it be a th of is of of be of a of is of 4(a) in a of of . et 8 (1997) 13- 18 18 kN/ + f=0 . 60 T 75 50 40 30 20- 10- 0 0 11 50 25 / , 4o 2O 10 I I l i t 0 10 20 30 40 50 (a) kN/ = 15 00 ? _ 5 0 / I I , I I i 1 o 20 30 40 50 (b) 8. c :,:of v/L as a of (a) p = 10t o = (b) f= H,B, = to of of 5. . of o, of v, on . it is to an so ./Fv on In to be (i) be = 0.5 it 0, a is (o/Bo be on be I E. of on of A,. 29 (1980). 2 5 189, g s,2, 1985. 3 K. . .
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