Wind loading calculations, worked example, Portal Frame скачать в хорошем качестве

Wind loading calculations, worked example, Portal Frame

This video shows you step by step all the formulas, tables and figures considered when designing for Wind Loading of a Mono-Pitched Portal Frame. British Standard used: BS 6399-2. Portal Frame Dimension Length: 73m Width: 36m Height: 7.35m Site Altitude : 88.8m Closest distance to sea: 10.7 km Roof pitch angle: 5 degrees Formula's used in steps. Step 1 - Dynamic Pressure, qs qs= 0.613 Ve^2 Ve = Effective wind speed m/s Step 2 - Effective Wind Speed, Ve Ve = Vs x Vb Vs = site wind speed Vb = basic wind speed Step 3 - Site Wind Speed, Vs Vs = Vb x Sa x Sd x Ss x Sp Sd = direction factor = 1.00 Ss = seasonal factor = 1.00 Sp = probability factor = 1.00 Vb = 24.5 m/s Sa = Altitude factor = 1 + 0.001 x Delta S Step 4 - Effective Wind Speed, Ve was worked out Step 5 - External Surface Pressure, Pe Pe = qs x Cpe x Ca qs = dynamic pressure Cpe = external pressure co-efficient Ca = size effect factor Step 6 - External Pressure Co-efficient worked out, Cpe Step 7 - Internal Surface Pressure, Pi Pi = qs x Cpi x Ca qs = dynamic pressure Cpi = internal pressure co-efficient Ca = size effect factor Step 8 - Net Surface Pressure, P P = Pe - Pi Pe = external pressure Pi = internal surface pressure Tables used in BS 6399-2: Table 4 - Factor Sb for standard method Table 9 - External pressure co-efficients Cpe for monopitch roofs of buildings Figures used in BS 6399-2: Figure 4 - Size effect factor Ca of standard method Figure 6 - Basic wind speed Vb (in m/s) Figure 19 - Key for monopitch roofs Thank you for watching this video. I hope it was helpful.