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LEGENDA: |
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ZEBRANIE OBCIĄŻEŃ |
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- wzory |
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- wyniki |
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OBCIĄŻENIE WIATREM |
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- wstawić |
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nb = |
c dir |
X |
c season |
X |
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nb,0 |
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c dir= |
1 |
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ma być 1 |
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c season= |
1 |
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ma być 1 |
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nb,0 = |
26 |
[m/s] |
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Tablica NB.1 (2 str.) |
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nb = |
26 |
[m/s] |
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TEREN KATEGORII |
II |
→ |
Z0 = |
0.05 |
[m] |
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Tablica 4.1 (22 str.) |
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Zmin = |
2 |
[m] |
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Tablica 4.1 (22 str.) |
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Zmax = |
200 |
[m] |
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ma być 200m (str 22) |
wysokość budynku - |
Z = |
7.3 |
[m] |
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szerokość budynku - |
d = |
30 |
[m] |
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długość budynku - |
b = |
72 |
[m] |
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rozzstaw ram - |
S = |
7.2 |
[m] |
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rozzstaw płatwi - |
Sp = |
1.5 |
[m] |
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Bazowe ciśnienie prędkości wiatru |
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qb = |
0.5 |
X |
r air |
X |
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nb |
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r air = |
1.25 |
[kg/m3] |
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qb = |
422.5 |
N/m2 |
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► Szczytowe ciśnienie prędkości wiatru |
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qp(z) = [1 |
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7 |
X |
lv(z) ] |
X |
0.5 |
X |
r |
X |
nm (z) |
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średnia prędkość wiatru |
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nm (z) = cr(z) x co(z) x nb |
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współczynnik ortografii – MOŻNA WYBRAĆ Z ZAŁĄCZNIKA KRAJOWEGO !!! |
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NORMA |
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co(z)= |
1 |
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99% że=1, sprawdzić w normie 4.3.3 |
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cr(z)= |
kr x ln (z/z0) |
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dla |
zmin |
≤ |
Z |
≤ |
zmax |
0.946885258124584 |
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cr(z)= |
cr (zmin) |
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dla |
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Z |
≤ |
zmin |
0.700887096281648 |
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Kf = |
0,19 x |
(z0/z0,II)^0,07 |
= |
0.19 |
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ZAŁĄCZNIK KRAJOWY |
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Kat. Terenu |
II |
cr(z)= |
(z/10)^0,17 |
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dla |
zmin |
≤ |
Z |
≤ |
zmax |
0.947905157443512 |
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to jest tylko dla kat II – resztę dorobić |
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cr(z)= |
cr (zmin) |
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dla |
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Z |
≤ |
zmin |
0.760632887818405 |
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nm (z) = |
24.619 |
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Intensywność turbulencji |
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Iv (z) = kI / co(z) x ln (Z/Z0) |
dla |
zmin |
≤ |
Z |
≤ |
zmax |
0.200657892146633 |
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Iv (z) = Iv (zmin) |
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dla |
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Z |
≤ |
zmin |
0.271085030681817 |
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Kl = |
1 |
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ma być 1 |
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qp(z) = |
0.911 |
kN/m2 |
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PARCIE WIATRU NA POWIERZCHNIĘ |
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- WSPÓŁCZYNNIK CIŚNIENIA ZEWNĘTRZNEGO |
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We = qp(z) x cpe |
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► ściany pionowe |
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dla |
h/d = |
0.243333333333333 |
≤ |
0,25 lub 1 lub 5 |
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D: |
cpe = |
0.7 |
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Tablica 7.1 (39 str.) |
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E: |
cpe = |
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► połać dachu |
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G: |
cpe = |
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lub |
0.0 |
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Tablica 7.4a (46 str.) |
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H: |
cpe = |
-0.6 |
lub |
0.0 |
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UWAGA!!! |
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NA JEDNEJ POŁACI NIE MOŻE BYĆ SSANIA I PARCIA RÓWNOCZEŚNIE |
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I: |
cpe = |
-0.6 |
lub |
0.0 |
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J: |
cpe = |
-0.6 |
lub |
0.2 |
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- WSPÓŁCZYNNIK CIŚNIENIA WEWNĘTRZNEGO |
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Wi = qp(zi) x cpi |
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Cpi= |
-0.2 |
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Sprawdzić w normie 7.2.9. lub bardziej niekorzystny +0,2; -0,3 |
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+,02 - to jest na zewnątrz, dlatego |
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W = (cpe + cpi) x qp(z) x s |
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dla D: |
W1 = |
3.28 |
kN/m |
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dla E: |
W2 = |
-3.28 |
kN/m |
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dla G: |
W3 = |
-9.18 |
kN/m |
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dla H: |
W4 = |
-5.25 |
kN/m |
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dla I: |
W5 = |
-5.25 |
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dla J: |
W6 = |
-5.25 |
kN/m |
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