Serviceability limit state - Eurocodes
Serviceability limit state - Eurocodes
Serviceability limit state - Eurocodes
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Crack width for stabilised crack formation<br />
G. Hanswille<br />
Univ.-Prof. Dr.-Ing.<br />
Institute for Steel and<br />
Composite Structures<br />
University of Wuppertal-Germany<br />
f<br />
E<br />
N s<br />
ct<br />
c<br />
ε<br />
ε<br />
s,2<br />
ε s(x)<br />
ε c(x)<br />
σ<br />
=<br />
E<br />
s2<br />
s<br />
s r,max<br />
= 2 L es<br />
w<br />
β= 0,6 for short term loading<br />
β= 0,4 for long term loading and<br />
repeated loading<br />
Crack width for high bond bars<br />
w = sr,max<br />
( εsm<br />
− εcm)<br />
Mean strain of reinforcement and<br />
concrete:<br />
εs,m<br />
= εs,2<br />
− β Δ εs<br />
A<br />
ε s(x)<br />
- ε<br />
c fctm<br />
f<br />
c(x) εs,m<br />
= εs,2<br />
− β = εs,2<br />
− β<br />
Es<br />
As<br />
Es<br />
ρ<br />
f<br />
ε<br />
ctm<br />
cm =β<br />
Ec<br />
s r,min<br />
= L es<br />
ε<br />
sm<br />
− ε<br />
cm<br />
=<br />
σ<br />
E<br />
s<br />
s<br />
f<br />
− β<br />
E<br />
ctm<br />
s<br />
ρ<br />
s<br />
(1+<br />
n<br />
o<br />
ρ<br />
s<br />
ctm<br />
)<br />
s<br />
29
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