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(6 3 )
( ): c=1.5, s=1.15 g=1.35 (1.00), q=1.5 (0.00) /: 25 kN/m3; fcd = fck/c (MPa); fyd = fyk/s (MPa); fcm = fck+8 (MPa); Ecm = 9.5(fck+8)
1/3 (GPa); fctm = 0.3fck2/3 (MPa)
fctk0.05 = 0.7fctm (MPa); Rd = 0.25fctk0.05/c (MPa); fc1=fck+4.13; co1=co(1- 3/fck); Es = 200 GPa
(mm) 8 10 12 14 16 18 20 22 22
s (mm2) 50.3 78.5 113 154 201 254 314 380 491
: 1 2 3 4 : - 5 mm
cmin (mm) = 20 25 30 30-45 cnom = cmin + 5 (mm)
, , &
: fbd = 1234fctk0.05/c : 1 = 1 = 2.25 2 = 1 = 0.7 ( : )
3 = 1 30 = (132-)/100 > 32. 4 = 1 () = 1.4 3 .
: fb = fs/4b . , fb = dM/(jddx) = V/(jd)
: max (max, 20mm, d.+5mm) , : d. : .
: b = (/4)(fyd/fbd) : b,net = b(As,cal/As,eff) b,min , = 1 , = 0.7 (i) (ii) . : As,cal/As,eff = 1.
: b,min = max(0.3b 0.6b , 10)
: 25% .
: Ft = Vsda/d 0.5Vsd. : b 0.66 b,net.
b,min.
5 .
( ): o = a1b,net max(0.3a1b, 15, 200 mm) (.) o = b,net (). : 1.5o, & 0.3o .
a1: :
&
%
20% 25% 33% 50% >50% 10 5 1.2 1.4 1.6 1.8 2.0
> 10 > 5 1.0 1.1 1.2 1.3 1.4
75%
(DA) , (D) S220 S400, S500 S220 S400, S500
< 20 mm 2.5 4.0 c. > 100 mm > 7 10 10
20 mm 5.0 7.0 c. > 50 mm > 3 10 15
c. 50 mm 3 15 20
: 5 (10 )
:
mmd.s
);acot(d.s
f/f.
max,t
max,b
ykckmin,w
600750
1750
080
&
-
(+)
: : c < 0.002, cd=0.85fcd1000c(1-250c); 0.0020< c < 0.0035, cd=0.85fcd. : yd=fyd/Es, : s < 0.0035 (), s < 0.020 ()
: =c/x = s1/(d-x). x=[c/(c+ s1)]d = d (y) = y. bal = 0.0055/d; xbal=0.64d; bal=0.64
Fc=db0.85fcd; =1000c(6-1000c)/12, c 0.45. : R=MR/bd2fcd=R(ycg/d)-[0.85(0.4)-( s1-s2(d2/d))fyd/fcd]
: R0.266, s10.33fcd/fyd. s1,bal =0.435fcd/fyd. x=1.47s1fyd/fcdb. R= 0.68(1-0.4),
R= s1(fyd/fcd)(1-0.58s1(fyd/fcd)). : R= limbd2+MR. s2=Rfcd/fyd[1/1-(d2/d)].
: s1bd-NSd/fyd. e=MSd/NSd. : Rd,crush=0.85fcd(Ag-As)+Asfyd
: Rd,tension=Asfyd
: : bef = bw+o/5 : bef = bw+o/10 (: bw = ) o = 0.3 ( ), 0.6 ( ), 0.8 ( ), 1.5 (). : = n + ti n = ti = 0.5t t, ti = min (t/3, 0.025n) - t ti = min (t/2, 0.025n) - t.
: < lim,f = hf/0.8d; lim,f=0.68(hf/0.8d)(1-0.5hf/d); Rd=MRd/beffd2fcd< lim,fAs1= s1beffd; ,
w= MRd-lim,fbeffd2fcd, w=/bwd
2fcd
-
cotfzs
AV
tancot/fvzbV
ywd
sw
s,Rd
cdwmax,Rd
: q=M(A/)/[jd(o/2)]. vRd2=2fcdhf. vRd3=(Asf/s)fyd,f+2.5Rdhf (vc=0 . ). sf,min=Asf/sh (.)
: 1,2=0.5(x+y)[(x-y)2/4+2]1/2. Ls=Mmax/V. VEd>VRd,C VEd < {VRd,s, VRd,max}
VRd,C = [CRdk(100fck)1/3+0.15cp]bwd
-
(+)
:
:
:
:
realef tc2u
At
cotA2
T
s
A
k
Edywd
sw f
),min(
cot175.0
8/
minmax
hb
d
u
s
w
:
:
350 mm
002.0232
243
002.064
8
'
c
cc
cc
c
c
c
002.03
23
002.012
6
c
c
c
ccc
yd
d
yd
cds
NdbA
ff
f
yd
cd
2
imsd2s db
dd1A
f
f
efbb yd
d
yd
cd
2
imsdim1s
Ndb
dd1A
ff
f
efbb
dh601.0
8051
1
min ykim f
imimim 286.0688.0 cd
2
sdsd
db
M
f
-
(+) (CEB)
1. CEB
2. CEB S220
2. CEB S400
2. CEB S500
1. : 2. : yd
d
yd
cds
NdbA
ff
f
yd
cd22s
yd
d
yd
cd11s dbA
NdbA
f
f
ff
f
1 2