ObciΔ…ΕΌenie Ε›niegiemΪchu wg normy PN

ObciΔ…ΕΌenie Ε›niegiem dachu wg normy PN-EN 1991-1-3


Sn = uiβ€…*β€…Ceβ€…*β€…Cfβ€…*β€…Sk


uiβ€…βˆ’β€…Β wspolczynnikΒ ksztaltuΒ dachu


Ceβ€…βˆ’β€…Β wspolczynnikΒ ekspozycji = 1, 0


Β Cfβ€…βˆ’β€…Β wspolczynnikΒ termiczny = 1, 0


$$S_{k} - \ wartosc\ charakterystyczna\ obciazenia\ sniegiem\ gruntu,\ \frac{\text{kN}}{m^{2}}$$

ObciΔ…ΕΌenie
Sk

f

Sd
ObciΔ…ΕΌenie Ε›niegiem na 1 m2rzutu poΕ‚aci dachowej:


0, 432


$$\frac{\text{kN}}{m^{2}}$$


0, 648


$$\frac{\text{kN}}{m^{2}}$$

OddziaΕ‚ywanie wiatru wg normy PN-EN 1991-1-4

  1. Bazowa prΔ™dkoΕ›Δ‡ wiatru.


Vb = Cdirβ€…*β€…Cseasonβ€…*β€…Vb, 0


Cdir = 1, 0


Cseason = 1, 0

Opole, strefa I, A~157 m.n.p.m < 300 m.n.p.m


Vb = 1, 0β€…*β€…1, 0β€…*β€…Vb, 0


$$V_{b,0} = 22\frac{m}{s}$$


$$\mathbf{V}_{\mathbf{b}}\mathbf{= 22}\frac{\mathbf{m}}{\mathbf{s}}$$

  1. Średnia prΔ™dkoΕ›Δ‡ wiatru.


Vm(z)=Cr(z)*C0(z)*Vb


Cr(z)β€…βˆ’β€…Β wspolczynnikΒ chropowatosci


C0(z)β€…βˆ’β€…wspolczynnikΒ rzezbyΒ terenu = 1, 0


Vm(z) = Cr(z)*Vb


zmin <  z < zmax


5Β m  <  8, 05Β m  <  200Β mΒ 


$$k_{r} = 0,19\left( \frac{z_{0}}{z_{0,\pi}} \right)^{0,07} = 0,19\left( \frac{0,3}{0,05} \right)^{0,07} = 0,215$$


$$C_{r}\left( z \right) = k_{r}*ln\left( \frac{z}{z_{0}} \right) = 0,215*ln\left( \frac{8,05}{0,3} \right) = 0,707$$


$$\mathbf{V}_{\mathbf{m}}\left( \mathbf{z} \right)\mathbf{= 0,707*1,0*22}\frac{\mathbf{m}}{\mathbf{s}}\mathbf{= 15,559}\frac{\mathbf{m}}{\mathbf{s}}$$

  1. Turbulencja wiatru.


$$I_{v}\left( z \right) = \frac{k_{1}}{C_{0}\left( z \right)*n\left( \frac{z}{z_{0}} \right)} = \frac{1,0}{1,0*\ln\left( \frac{8,05}{0,3} \right)} = 0,304$$

  1. WartoΕ›Δ‡ szczytowa ciΕ›nienia prΔ™dkoΕ›ci.


$$q_{p}\left( z \right) = \left\lbrack 1 + 7*I_{v}\left( z \right) \right\rbrack*\frac{1}{2}\rho*{V_{m}}^{2}(z)$$


$$\rho = 1,25\frac{\text{kg}}{m^{2}}$$


$$q_{p}\left( z \right) = \left\lbrack 1 + 7*0,304 \right\rbrack*\frac{1}{2}*1,25{*(15,559)}^{2}$$


$$q_{p}\left( z \right) = 473,27\frac{\text{kg}}{{m*s}^{2}} = 473,27\frac{N}{m^{2}} = 0,473\frac{\text{kN}}{m^{2}}$$

  1. CiΕ›nienie wiatru na powierzchnie zewnΔ™trzne.


we = qp(ze)β€…*β€…Cpe


qp(ze)β€…βˆ’β€…wartoscΒ szczytowaΒ cisnieniaΒ predkosci

zeβˆ’ wysokoΕ›Δ‡ odniesienia dla ciΕ›nienia zewnΔ™trznego


Cpeβ€…βˆ’β€…wspolczynnikΒ cisnieniaΒ zewnetrznego,  zalezyΒ odΒ wielkosciΒ obciazonejΒ 


powierzchni A

A > 10m2β†’Cpe = Cpe, 10


ze = z = 8, 05Β m


emin(b, 2h)


b = 12, 88Β m


2h = 2β€…*β€…9, 95Β m = 19, 9Β m


e = 12, 88Β m


$$\frac{e}{10} = 1,288\ m$$


$$\frac{e}{4} = 3,23\ m$$

dociΔ…ΕΌenie

KOMBINACJE OBCIĄŻEŃ


Ξ¨0, iβ€…βˆ’β€…wspolczynnikΒ czesciowyΒ 


βˆ’Β strop(kategoria A) → Ψ0 = 0, 7


βˆ’Β snieg → Ψ0 = 0, 5


βˆ’Β wiatr → Ψ0 = 0, 6

ObciΔ…ΕΌenie na wiΔ™ΕΊbΔ™ dachowΔ…:
Fk

f

Fd
  • ObciΔ…ΕΌenie staΕ‚e

  • OddziaΕ‚ywanie wiatru(Ξ¨0 = 0, 6):

  • G

  • H

  • I

  • J

  • ObciΔ…ΕΌenie Ε›niegiem( = 0, 5)

1,421

0,331

0,284

0

0

0,216

1,5

1,5

1,5

1,918

0,496

0,426

0

0

0,324


$$q_{A} = \begin{Bmatrix} *G_{k}:1,412 + 0,331 + 0,216 = 1,968\frac{\text{kN}}{m^{2}} \\ *G_{d}:1,918 + 0,496 + 0,324 = 2,738\frac{\text{kN}}{m^{2}} \\ *H_{k}:1,412 + 0,284 + 0,216 = 1,921\frac{\text{kN}}{m^{2}} \\ *H_{d}:1,918 + 0,426 + 0,324 = 2,668\frac{\text{kN}}{m^{2}} \\ *I_{k}:1,412 + 0 + 0,216 = 1,637\frac{\text{kN}}{m^{2}} \\ *I_{d}:1,412 + 0 + 0,324 = 2,242\frac{\text{kN}}{m^{2}} \\ *J_{k}:1,412 + 0 + 0,216 = 1,637\frac{\text{kN}}{m^{2}} \\ *J_{d}:1,412 + 0 + 0,324 = 2,242\frac{\text{kN}}{m^{2}} \\ \end{Bmatrix}$$

Reakcje podporowe:


$$\sum_{}^{}{M_{B} = 0:\ R_{1,k}*8,55 - G_{k}*1,288*\left( 8,606 \right) - H_{k}}*3,687*\left( 6,118 \right) - I_{k}*1,288*\left( 3,631 \right) - J_{k}*2,987*\left( 1,5 \right) + J_{k}*0,7*0,35 = 0$$


R1, kβ€…*β€…8, 55 = 79, 736


$$\mathbf{R}_{\mathbf{1,k}}\mathbf{= 9,326}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{B} = 0:\ R_{1,d}*8,55 - G_{d}*1,288*\left( 8,606 \right) - H_{d}}*3,687*\left( 6,118 \right) - I_{d}*1,288*\left( 3,631 \right) - J_{d}*2,987*\left( 1,5 \right) + J_{d}*0,7*0,35 = 0$$


R1, dβ€…*β€…8, 55 = 110, 513


$$\mathbf{R}_{\mathbf{1,d}}\mathbf{= 12,925}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{A} = 0:\ R_{2,k}*8,55 - I_{k}*3,687*\left( 7,406 \right) - I_{k}}*1,288*\left( 4,919 \right) - H_{k}*3,687*\left( 2,432 \right) - G_{k}*0,588*\left( 0,294 \right) + G_{k}*0,7*0,35 = 0$$


R2, kβ€…*β€…8, 55 = 72, 154


$$\mathbf{R}_{\mathbf{2,k}}\mathbf{= 8,439}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{A} = 0:\ R_{2,d}*8,55 - I_{d}*3,687*\left( 7,406 \right) - I_{d}}*1,288*\left( 4,919 \right) - H_{d}*3,687*\left( 2,432 \right) - G_{d}*0,588*\left( 0,294 \right) + G_{d}*0,7*0,35 = 0$$


R2, dβ€…*β€…8, 55 = 72, 154


$$\mathbf{R}_{\mathbf{2,d}}\mathbf{= 8,439}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{B} = 0:\ R_{3,k}*3,9 - q_{1,k}*3,285 - q_{2,k}*3,9*1,95 = 0}$$


3, 9β€…*β€…R3, k = 3, 08β€…*β€…3, 285β€…+β€…6, 62β€…*β€…3, 9β€…*β€…1, 95


3, 9β€…*β€…R3, k = 60, 463/:3, 9


$$\mathbf{R}_{\mathbf{3,k}}\mathbf{= 15,5}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{A} = 0:\ R_{4,k}*3,9 - q_{1,k}*0,615 - q_{2,k}*3,9*1,95 = 0}$$


3, 9β€…*β€…R4, k = 3, 08β€…*β€…0, 615β€…+β€…6, 62β€…*β€…3, 9β€…*β€…1, 95


3, 9β€…*β€…R4, k = 52, 239/:3, 9


$$\mathbf{R}_{\mathbf{4,k}}\mathbf{= 13,39}\frac{\mathbf{k}\mathbf{N}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{B} = 0:\ R_{3,d}*3,9 - q_{1,d}*3,285 - q_{2,d}*3,9*1,95 = 0}$$


3, 9β€…*β€…R3, d = 4, 62β€…*β€…3, 285β€…+β€…9, 084β€…*β€…3, 9β€…*β€…1, 95


3, 9β€…*β€…R3, d = 84, 261/:3, 9


$$\mathbf{R}_{\mathbf{3,d}}\mathbf{= 21,61}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{A} = 0:\ R_{4,d}*3,9 - q_{1,d}*0,615 - q_{2,d}*3,9*1,95 = 0}$$


3, 9β€…*β€…R4, d = 4, 62β€…*β€…0, 615β€…+β€…9, 084β€…*β€…3, 9β€…*β€…1, 95


3, 9β€…*β€…R4, d = 71, 925/:3, 9


$$\mathbf{R}_{\mathbf{4,d}}\mathbf{= 18,44}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{A} = 0:\ R_{5,k}*3,65 - q_{G,k}*3,65*1,825 = 0}$$


3, 65β€…*β€…R5, k = 8, 319β€…*β€…3, 65β€…*β€…1, 825


3, 65β€…*β€…R5, k = 55, 415/:3, 65


$$\mathbf{R}_{\mathbf{5,k}}\mathbf{= 15,18}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


$$\sum_{}^{}{M_{A} = 0:\ R_{5,d}*3,65 - q_{G,d}*3,65*1,825 = 0}$$


3, 65β€…*β€…R5, d = 11, 529β€…*β€…3, 65β€…*β€…1, 825


3, 65β€…*β€…R5, d = 76, 798/:3, 65


$$\mathbf{R}_{\mathbf{5,d}}\mathbf{= 21,04}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$

ZESTAWIENIE OBCIĄŻEŃ:

ObciΔ…ΕΌenie przypadajΔ…ce na Ε‚awΔ™ H1:


H1, k = R1, kβ€…+β€…2β€…*β€…qw1, kβ€…+β€…R5, kβ€…+β€…qD, kβ€…*β€…(4,05βˆ’0,23)mβ€…+β€…qF, kβ€…*β€…1, 05mβ€…+β€…qH1, k


$$H_{1,k} = 9,326\frac{kN}{m} + 2*1,521\frac{\text{kN}}{m} + 15,18\frac{\text{kN}}{m} + 3,585\frac{\text{kN}}{m^{2}}*\left( 4,05 - 0,23 \right)m + 9,19\frac{\text{kN}}{m^{2}}*1,05m + 7,5\frac{\text{kN}}{m}$$


$$\mathbf{H}_{\mathbf{1,k}}\mathbf{= 5}\mathbf{8}\mathbf{,}\mathbf{39}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


H1, d = R1, dβ€…+β€…2β€…*β€…qw1, dβ€…+β€…R5, dβ€…+β€…qD, dβ€…*β€…(4,05βˆ’0,23)mβ€…+β€…qF, dβ€…*β€…1, 05mβ€…+β€…qH1, d


$$H_{1,d} = 12,925\frac{\text{kN}}{m} + 2*2,054\frac{\text{kN}}{m} + 21,04\frac{\text{kN}}{m} + 5,209\frac{\text{kN}}{m^{2}}*\left( 4,05 - 0,23 \right)m + 12,422\frac{\text{kN}}{m^{2}}*1,05m + 10,125\frac{\text{kN}}{m}$$


$$\mathbf{H}_{\mathbf{1,d}}\mathbf{= 81,}\mathbf{13}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$

ObciΔ…ΕΌenie przypadajΔ…ce na Ε‚awΔ™ H4:


H4, k = qw1, kβ€…+β€…qD, kβ€…*β€…(5βˆ’0,23)mβ€…+β€…qF, kβ€…*β€…1, 05mβ€…+β€…qH4, k


$$H_{4,k} = 1,521\frac{\text{kN}}{m} + 3,585\frac{\text{kN}}{m^{2}}*\left( 5 - 0,23 \right)m + 9,19\frac{\text{kN}}{m^{2}}*1,05m + 7,5\frac{\text{kN}}{m}$$


$$\mathbf{H}_{\mathbf{4,k}}\mathbf{= 3}\mathbf{5}\mathbf{,}\mathbf{77}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


H4, d = qw1, dβ€…+β€…qD, dβ€…*β€…(5βˆ’0,23)mβ€…+β€…qF, dβ€…*β€…1, 05mβ€…+β€…qH4, d


$$H_{4,d} = 2,054\frac{\text{kN}}{m} + 5,209\frac{\text{kN}}{m^{2}}*\left( 5 - 0,23 \right)m + 12,422\frac{\text{kN}}{m^{2}}*1,05m + 10,125\frac{\text{kN}}{m}$$


$$\mathbf{H}_{\mathbf{4,d}}\mathbf{=}\mathbf{50}\mathbf{,}\mathbf{07}\frac{\mathbf{\text{kN}}}{\mathbf{m}}$$


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