Wind loads on buildings.

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Znywhn

Engineering

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This project from structural Analysis course. Chapter 26-27

Determine MWFRS Wind Loads for Enclosed, Partially Enclosed and Open Buildings of All Heights.

you will see the question attached below and my given wind speed is; 150 mph.

you should apply the given wind speed to the steps that I will provide with the question below.

and also I can give an access to the chapters to follow the steps and see the equations.


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Project-1 Using regular approach for building of all heights in chapter 26 and 27 , determine the basic wind pressures for a commercial building with 15 feet eave height. The building is rectangular in plan with dimension 45 ft by 40 ft, gable roof with angle =26.6 and the mean roof height h= 20 ft. It is assumed that the building is located in a flat terrain with exposure B in all directions and it is enclosed. Draw the wind pressures on walls and roof and show the values. CHAPTER 27 WIND LOADS ON BUILDINGS_MWFRS (DIRECTIONAL PROCEDURE) Table 27.2-1 Steps to Determine MWFRS Wind Loads for Enclosed, Partially Enclosed and Open Buildings of All Heights Step 1: Determine risk category of building or other structure, see Table 1.4-1 Step 2: Determine the basic wind speed, V, for the applicable risk category, see Figure 26.5-1A, B or C 9, = velocity pressure calculated using Eq. 27.3-1 at height z 9n = velocity pressure calculated using Eq. 27.3-1 at mean roof height h. The numerical coefficient 0.00256 (0.613 in SI) shall be used except where sufficient climatic data are available to justify the selection of a different value of this coefficient for a design application. 27.4 WIND LOADS MAIN WIND FORCE-RESISTING SYSTEM Step 3: Determine wind load parameters: > Wind directionality factor, K., see Section 26.6 and Table 26.6-1 > Exposure category, see Section 26.7 >> Topographic factor, K,, see Section 26.8 and Table 26.8-1 > Gust Effect Factor, G, see Section 26.9 Enclosure classification, see Section 26.10 > Internal pressure coefficient, (GCpi), see Section 26.11 and Table 26.11-1 27.4.1 Enclosed and Partially Enclosed Rigid Buildings Design wind pressures for the MWFRS of buildings of all heights shall be determined by the following equation: p = 460 – 9(GC) (lb/ft?) (N/m') (27.4-1) where Step 4: Determine velocity pressure exposure coefficient, K, or Ki, see Table 27.3-| Step 5: Determine velocity pressure q, or 9, Eq. 27.3-1 Step 6: Determine external pressure coefficient, Cor Cw Fig. 27.4-1 for walls and flat, gable, hip. monoslope or mansard roofs ► Fig. 27.4-2 for domed roof's Fig. 27,4-3 for arched roofs » Fig. 27.4-4 for monoslope roof, open building > Fig. 27.4-5 for pitched roof, open building Fig. 27.4-6 for troughed roof, open building >> Fig. 27.4-7 for along ridge/valley wind load case for monoslope, pitched or troughed roof, open building Step 7: Calculate wind pressure, p, on each building surface Eq. 27.4-1 for rigid buildings Eq. 27.4-2 for flexible buildings Eq. 27.4-3 for open buildings g = 9, for windward walls evaluated at height z above the ground 9 = 9 for leeward walls, side walls, and roofs, evaluated at heighth 9= 9, for windward walls, side walls, leeward walls, and roofs of enclosed buildings and for negative internal pressure evaluation in partially enclosed buildings 91 = 9for positive internal pressure evaluation in partially enclosed buildings where height z is defined as the level of the highest opening in the building that could affect the positive internal pressure. For buildings sited in wind-borne debris regions, glazing that is not impact resistant or protected with an impact resistant covering shall be treated as an opening in accordance with Section 26.10.3. For positive internal pressure evaluation, 9. may conservatively be evaluated at height hq = 4x) G = gust-effect factor, see Section 26.9 C = external pressure coefficient from Figs. 27.4-1. 27.4-2 and 27.4-3 (GC) = internal pressure coefficient from Table 26.11-1 9 and 4, shall be evaluated using exposure defined in Section 26.73. Pressure shall be applied 27.3.2 Velocity Pressure Velocity pressure, 93, evaluated at height z shall be calculated by the following equation: 4, = 0.00256K KYK V (Ib/nt") (27.3-1) In SI: 4 = 0.613KK,K,V (N/m?); V in m/s] where K = wind directionality factor, see Section 26.6 K. = velocity pressure exposure coefficient, see SAMSUNG
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Anonymous
Just what I was looking for! Super helpful.

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