Deformasjonsmetoden
Deformasjonsmetoden
Deformasjonsmetoden
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⎡3EI 16EI 8EI 3EI ⎤<br />
+ − ⎡ 21 ⎤ P<br />
⎢ 2<br />
l l l l<br />
⎥<br />
2 ⎢<br />
− l<br />
⎢ ⎥ ⎡ θ ⎤ 128 ⎥<br />
⎢ 8EI 16EI 6EI 6EI ⎢ ⎥<br />
+ − ⎥ ⎢<br />
θ<br />
⎥<br />
2 3 = ⎢ 0<br />
⎢ l l l ⎥ ⎢ ⎥ ⎥<br />
l<br />
⎢ ⎥ ⎢⎣ w ⎢<br />
2 ⎥⎦<br />
117 ⎥<br />
⎢<br />
⎢⎣<br />
Ligningssystem<br />
3EI 6EI 3EI 6EI P<br />
− − + ⎥ ⎢ ⎥<br />
2 2 3 3 ⎣ 128 ⎦<br />
l l l l ⎥⎦<br />
Løsning<br />
Pl<br />
θ 3 = −0.0039 EI<br />
Pl<br />
θ b = −0.0351 EI<br />
w<br />
l<br />
2<br />
2<br />
2<br />
2<br />
Pl<br />
= 0.1237 EI<br />
Elementkrefter:<br />
3 2<br />
3EI ⎛ 1 Pl<br />
1 Pl<br />
⎞ 117<br />
Q21 = ⎜ 0.1237 −<br />
2<br />
( −0.0039)<br />
⎟ − P = −0.53P<br />
l ⎝ l EI l EI ⎠ 128<br />
3 2<br />
3EI ⎛ 1 Pl<br />
Pl<br />
⎞ 21<br />
M21<br />
= ⎜ − 0.1237 + ( − 0.0039)<br />
⎟ + Pl<br />
= −0.22Pl<br />
l ⎝ l EI EI ⎠ 128<br />
3 2<br />
6EI ⎛ 1 Pl<br />
1 Pl<br />
⎞<br />
Q34 = ⎜ 0.1237 −<br />
2<br />
( 0.0351)<br />
⎟ = 0.53P<br />
l ⎝ l EI l EI ⎠<br />
3 2<br />
6EI ⎛ 1 Pl<br />
Pl<br />
⎞<br />
M34<br />
= ⎜ − 0.1237 + ( 0.0351)<br />
⎟ = −0.53Pl<br />
l ⎝ l EI<br />
EI ⎠