Serviceability limit state - Eurocodes
Serviceability limit state - Eurocodes
Serviceability limit state - Eurocodes
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Direct calculation of crack width w for<br />
composite sections based on EN 1992-2<br />
G. Hanswille<br />
Univ.-Prof. Dr.-Ing.<br />
Institute for Steel and<br />
Composite Structures<br />
University of Wuppertal-Germany<br />
A s<br />
-M s<br />
N s<br />
-M a<br />
σ s,<br />
M Ed<br />
-z st,s<br />
z st<br />
crack width for high bond bars:<br />
σ<br />
α<br />
s<br />
st<br />
=<br />
M<br />
J<br />
A<br />
=<br />
A<br />
Ed<br />
st<br />
st<br />
a<br />
J<br />
J<br />
a<br />
z<br />
st<br />
st,s<br />
+ β<br />
f<br />
ρ<br />
ct,eff<br />
s<br />
c<br />
α<br />
st<br />
A<br />
ρ<br />
s<br />
s = β = 0, 4<br />
A<br />
w = s<br />
ε<br />
s<br />
sm<br />
r,max<br />
− ε<br />
r,max<br />
cm<br />
-N a<br />
( εsm<br />
− εcm)<br />
σs<br />
f<br />
− β<br />
ctm<br />
E E ρ<br />
s<br />
=<br />
s<br />
= 3,4c + 0,34<br />
s<br />
d<br />
ρ<br />
s<br />
s<br />
s<br />
(1+<br />
n<br />
o<br />
ρ<br />
s<br />
)<br />
≥<br />
0,6<br />
σ<br />
E<br />
s<br />
c - concrete cover of reinforcement<br />
37
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