BEF-PCSTATIK PC-Statik Bjælkeberegning efter EC2
BEF-PCSTATIK PC-Statik Bjælkeberegning efter EC2
BEF-PCSTATIK PC-Statik Bjælkeberegning efter EC2
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Udvikling Konstruktioner <strong>PC</strong>-<strong>Statik</strong><br />
<strong>BEF</strong>-<strong><strong>PC</strong>STATIK</strong> <strong>Bjælkeberegning</strong> <strong>efter</strong> <strong>EC2</strong><br />
dN<br />
dt<br />
ALECTIA A/S<br />
c<br />
dN<br />
dt<br />
c<br />
dN<br />
dt<br />
c<br />
A B <br />
bxDt<br />
<br />
B<br />
3<br />
B <br />
A B <br />
B<br />
bxDt<br />
3 <br />
<br />
<br />
B <br />
A B <br />
B<br />
bxDt<br />
3 <br />
<br />
B <br />
1 Bt <br />
dNc<br />
dt<br />
<br />
bxDt<br />
<br />
<br />
<br />
2<br />
t <br />
<br />
1 Bt <br />
Det ses at integralet er i orden.<br />
2 1 Bt 2B1<br />
Bt <br />
1 Bt<br />
2 2 1 B t 2Bt<br />
<br />
A B<br />
<br />
bx<br />
c<br />
B <br />
2B<br />
<br />
<br />
1 Bt <br />
B <br />
<br />
<br />
<br />
<br />
<br />
2<br />
B B t B <br />
A B <br />
3 2<br />
2 2 <br />
B t <br />
<br />
<br />
bxDt<br />
<br />
<br />
3<br />
1 Bt<br />
<br />
<br />
B 1 Bt <br />
Her<strong>efter</strong> kan afstanden y’ fra resultantens placering til nullinien bestemmes.<br />
Dette gøres ved at bestemme resultantens moment omkring nullinien.<br />
y'<br />
N<br />
c<br />
y'<br />
N<br />
c<br />
y'<br />
N<br />
c<br />
y'<br />
N<br />
c<br />
y'<br />
N<br />
c<br />
1<br />
2<br />
bx t<br />
cdt<br />
<br />
<br />
1 <br />
2<br />
bx D<br />
t<br />
<br />
2<br />
<br />
2 1<br />
bx D<br />
t<br />
3<br />
<br />
3<br />
1<br />
<br />
2 3<br />
bx D<br />
1<br />
<br />
3<br />
<br />
<br />
1 2<br />
bx D1<br />
<br />
3 <br />
<br />
A B<br />
<br />
3<br />
2<br />
<br />
1 Bt 31<br />
Bt 31<br />
Bt <br />
A B<br />
<br />
<br />
1 Bt <br />
A B<br />
3<br />
2<br />
2 1 B<br />
91<br />
B<br />
181<br />
B<br />
6ln1<br />
B<br />
...<br />
4<br />
6B<br />
3 A B<br />
3<br />
2<br />
21<br />
B<br />
91<br />
B<br />
181<br />
B<br />
6ln1<br />
B<br />
<br />
3<br />
6B<br />
<br />
4<br />
3<br />
t <br />
dt<br />
<br />
1 Bt <br />
<br />
<br />
<br />
<br />
A B <br />
1 B <br />
3 3 2 2<br />
2B<br />
4<br />
3B<br />
4<br />
<br />
2B<br />
1 <br />
<br />
3B<br />
1 <br />
<br />
<br />
<br />
...<br />
<br />
<br />
<br />
6B<br />
1 <br />
6ln<br />
<br />
1 B<br />
<br />
17681-<strong>BEF</strong>-<strong><strong>PC</strong>STATIK</strong>-318422-2.doc Side 13 af 66<br />
2B<br />
Integraler kontrolleres ved differentiation.<br />
dy'<br />
N<br />
dt<br />
c<br />
dy'<br />
N<br />
dt<br />
c<br />
dy'<br />
N<br />
dt<br />
c<br />
2 <br />
bx Dt<br />
<br />
<br />
2<br />
bx Dt<br />
<br />
<br />
<br />
2<br />
bx Dt<br />
<br />
2<br />
2<br />
2<br />
A B <br />
B<br />
4 <br />
B <br />
a b <br />
B<br />
<br />
4 <br />
B <br />
dy'<br />
Nc<br />
dt<br />
<br />
2 2<br />
bx Dt<br />
<br />
<br />
3<br />
<br />
t <br />
<br />
<br />
1 Bt <br />
Det ses at integralet er i orden.<br />
2 1 Bt 3B1<br />
Bt <br />
4<br />
B<br />
4<br />
1<br />
ln<br />
4<br />
B<br />
3<br />
2<br />
1 Bt 3B1<br />
Bt 3B1<br />
Bt <br />
2 3<br />
A B <br />
B 3B<br />
t 3B<br />
t<br />
<br />
4 <br />
B <br />
2<br />
A B<br />
bx t<br />
c<br />
1 Bt<br />
2<br />
B t<br />
B <br />
3B<br />
<br />
<br />
1 Bt <br />
4 3<br />
3B<br />
3B<br />
t<br />
1 Bt<br />
B <br />
<br />
<br />
<br />
<br />
<br />
Resultantens placering målt fra nullinien kan herved bestemmes som<br />
3 2<br />
1<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
2<br />
2<br />
6B<br />
t 3B<br />
3B<br />
t B