Serviceability limit state - Eurocodes
Serviceability limit state - Eurocodes
Serviceability limit state - Eurocodes
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N s<br />
Determination of initial crack width<br />
w<br />
N s<br />
crack width<br />
G. Hanswille<br />
Univ.-Prof. Dr.-Ing.<br />
Institute for Steel and<br />
Composite Structures<br />
University of Wuppertal-Germany<br />
ε<br />
ε s,m<br />
ε s<br />
(x)<br />
ε c<br />
(x)<br />
ε s,2<br />
Δε s,cr<br />
w = 2L<br />
es<br />
( ε<br />
sm<br />
− ε<br />
cm<br />
εs ,m − εcm<br />
= ( 1− β)<br />
εs,2<br />
)<br />
ε c,m<br />
ε cr<br />
L es<br />
L es<br />
L<br />
es<br />
=<br />
σs<br />
d<br />
4 τ<br />
s<br />
sm<br />
1<br />
1+<br />
n ρ<br />
o<br />
s<br />
σ s<br />
τsm<br />
≈ 1,8 f ctm<br />
σ s,m<br />
βΔσ s<br />
Δσ s<br />
L es<br />
L es<br />
σ s<br />
σ s,1<br />
σ c,1<br />
x<br />
2<br />
(1− β)<br />
σs<br />
d<br />
w =<br />
s<br />
2 τsm<br />
Es<br />
1<br />
1+<br />
no<br />
ρs<br />
with β= 0,6 for short term loading und<br />
β= 0,4 for long term loading<br />
27
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