2. A roof design supports a dead load of 65 lb/ft² and a snow load of 40 lb/ft² In addition, a wind pressure of 20 lb/ft² (uplift or downward) must be accommodated. Determine the governing load condition.
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- Beam DesignA roof design supports a dead load of 65 lb/ft2 and a snow load of 40 lb/ft2 In addition, a wind pressure of 20 lb/ft2 (uplift or downward) must be accommodated. Determine the governing load conditionA rigid building structure has the following particulars: Dimensions: 10 m x 20 mx 16.6 m high Located in an area classified as exposure B. Is neither open nor partially closed. Risk category: I Wind is 120 km/h and acts on the wall with the higher dimension. What is the external wind pressure on the side wall? O a. formula: wind pressure = qGC₂ = (0.613K₁K₂tKalV²) X G X Cp -248 N/m² O b. -896 N/m² O c. -386 N/m² O d. -333 N/m²When a roof is subjected to downward wind load, which one of the following multiplication factors for dead loads is considered favourable in Australian Standard (load combination for ultimate limit state, considering both dead load and live load)? O 1.0 O 1.2 O 0.9 O 1.35
- 2) What is the design live load for the roof with slope of 1(vertical):2(horizontal) and At of 500 square feet? (Group 2)The roof of the building is subject to a wind force 600 lb. Resolve this force into its vertical and horizontal rectangular componentes.2. Roof joists are spaced at 2m and span 6m between supporting girders, and joist depth of 600mm. The allowable deflection limits for OWSJ are L/360 under snow load. The OWSJS are subjected to a dead load of 2.96kPa which includes the estimate joist weight of 0.15kPa, an occupancy load of 2.4kPa, and the following: SULS 1.99kPa SSLS = 1.25kPa Select a suitable OWSJ which satisfies the limit states design.
- QUESTION 1 A flat roof spanning 4.25 n is to be designed using C24 timber joists at 600 mm centres as shown in Figure Qi. Loads from the proposed roof construction are: Asphalt 20 mm thick : 0.45 kN/m Insulation Roof decking boards : 0.30 kN/m Timber firrings Suspended tile ceiling : 0.15 kN/m? :0.10 kN/m :0.01 kN/m The building is at an elevation of 50 m above sea level and the roof is to be designed for a wind load of 0.6 kN/m. The height available from the supports to the underside of the decking is 150 mm, and the ends of the joist may have to be notched to fit this dimension. Assuming that the roof decking provides full lateral restraint to the joist, choose a suitable size for the joist timbers. Tasks required: (a) Loading analysis (b) Timber properties and parameters for design (c) Bending capacity check (ULS) (d) Shear capacity check (ULS) (e) Bearing capacity check (ULS) (f) Deflection limit check (SLS) 100 mm wide bearings Joists at 600 mm centres Joist span 4.25 m Figure QIThe load information for a non-floor type roof is given as follows. The spacing between purlins is 2.0 m. The ultimate limit load combination for the selection of roof purlin is Dead load 0.5 kPa Live load = 0.25 kPa External wind (ULS) = -3.0 kPa Internal wind (ULS) = 1.5 kPa or -0.5 kPa -7.8 kN/m -6.1 kN/m -3.0 kN/m -8.1 kN/mWhy does the maximum snow load occur simultaneously with the maximum dead and live loads?
- Problem #2: A flat roof is subject to the following uniformly distributed loads: a dead load of 21 psf (pounds per square foot of roof surface), a roof live load of 12 psf, a snow load of 13.5 psf, and a wind load of 22 psf upward. (Although the wind itself is in a horizontal direction, the force that it exerts on this roof is upward. It will be upward regardless of wind direction. The dead, live, and snow loads are gravity loads and act downward.) If load and resistance factor design is used, compute the factored load (ZyQ) in pounds per square foot. Which ASCE 7 load combination controls?A roof system with W16×40 section spaced 9ft on centre is to be used to support a dead load D=40psf and LR, S, R=30psf w=20psf compute goverinng facture loadan urban hospital located in central illinois has a flat roof. determine the snow load in KN/msquare that is required to design the roof