VELOCITY PRESSURE

WIND LOADING AS PER EN 1991-1-4:2005

I.Basic Data:TERRAIN CATEGORYReference Height , Z=9.60m.ZminZ0Structure Width=29.00m.Wall height=8.60m.010.003 Sea or coastal area exposed to the open sea.Roof Slope=3.55deg.I10.01 Lakes or flat and horizontal area with negligible vegatation and without obstacles.Ze, for external pressure=m.II20.05 Area with low vegetation such as grass and isolated obstacles (trees, buildings) with separations of at least 20 obstacle heights.Terrain category=IIIsee Table 4.1III50.3 Area with regular cover of vegetation or buildings or with isolated obstacles with separations of maximum 20 obstacle heights (such as villages, suburban terrain, permanent forest). Area with regular cover of vegetation or buildings or with isolated obstacles with separations of maximum 20 obstacle heights (such as villages, suburban terrain, permanent forest).IV101 Area in which at least 15% of the surface is covered with buildings and their average heights exceeds 15.0 m.

II.Basic Wind Velocity, vb :vb = cdir x c season x vb,oEquation 4.1

Directional factor, cdir =1.00recommended value=1.0, Note 2, section 4.2Seasonal factor, cseason=1.00recommended value=1.0, Note 3, section 4.2Fundamental wind velocity=35.00m/s

vb=35.00m/sIII. Mean Wind Velocity, vm(z) :vm(z) = cr(z) x co(z) x vbEquation 4.3Orography factor, co(z)=1.00recommended value=1.0Roughness factor, cr(z) cr(z) = kr x ln(z/zo)Equation 4.4Roughness length, z0=0.300m.Z0 for terrain category II, zo,II=0.05m.see Table 4.1Zmin=5.00m.Z=9.60m.use, Z=9.60m. kr = 0.19 x (zo/zo,II)0.07Equation 4.5therefore, kr=0.21539therefore, cr(z)=0.74648vm(z)=26.127m/sIV. Wind Turbulence, lv(z) :lv(z) = k1/(co(z) x ln(z/zo))Equation 4.7turbulence factor, k1=1.00recommended value = 1.0, Note 2, section 4.4therefore, lv(z)=0.28854

V.Basic Velocity Pressure, qb :

qb = 1/2 x air x vb2air density, air=1.25kg/m3recommended value = 1.25, Note 2, section 4.5therefore, qb=765.63Pa (N/m2)VI. Peak Velocity Pressure, qp :qp(z) = [1 + 7lv(z)] x 1/2 x air x vm2(z)Equation 4.8, Note 1, section 4.5where,lv(z)=0.28854air=1.25kg/m3vm(z)=26.127m/stherefore, qp(z)=1288.34Pa (N/m2)

qp(z)=1.288kPa (kN/m2)VII. COMPUTATION OF WIND PRESSURE TO VERTICAL WALLS:

ALONG X:h/d =0.123 LONGITUDINAL DIRECTION e = smaller value of 2h or b:2h = 12.6b =15.75e = 12.6DESIGN WIND PRESSUREZONE DZONE ECpe, 100.700-0.300PRESSURE0.90-0.39CORR. COEFF.0.850.85DESIGN PRESSURE0.77-0.33Kpa

ALONG Z ::h/d =0.331 TRANSVERSE DIRECTION e = smaller value of 2h or b:2h = 12.3b =15.75e = 12.3ZONE DZONE ECpe, 100.711-0.322PRESSURE0.92-0.41CORR. COEFF.0.850.85DESIGN PRESSURE0.78-0.35Kpa

VIII.LOAD COMPUTATIONALONG X :Ap =2F26.1m2-Projected AreaFF121.8m2-Projected AreaTotal =147.9m2-Total projected AreaCpnet1.0-sum of windward and leeward# COL =207-Number of Columns2F -F=0.14KN-load per column1F -F=0.64KN-load per column

ALONG Z :Ap =2F109.13m2-Projected AreaFF327.4m2-Projected AreaTotal =436.53m2-Total projected AreaCpnet1.0-sum of windward and leeward# COL =207-Number of Columns2F -F=0.60KN-load per column1F -F=1.79KN-load per column

&"-,Bold"G+2, CP07B, TEMPORARY SITE OFFICE(STRUCTURAL ANALYSIS & DESIGN REPORT)

Page &P of &N

EXTERNAL WALLSWIND PRESSURE ON SURFACESABCDEINTERNAL PRESSURE COEFFICIENTSh/d5-1.2-0.8-0.50.8-0.7A. VERTICAL WALLS1-1.2-0.8-0.50.8-0.5