![]() You may neglect the weight of the girder. Design the lightest W14 x _ section for this girder assuming A572, grade 50 steel. # 30' Partial Floor Framing Plan A steel girder spanning 32’ supports three concentrated beam reactions as shown. There is no depth restriction and the beam weight may be neglected. Design the most economical (lightest) ‘W’ section for the beam. The floor live load is 100 psf and the dead load is 100 psf. The typical interior bay of a building is 30’ x 30’ in plan and is framed with A572 (grade 50) beams and girders as shown. Section 8 - De昀氀ection in Beams Problem 8. If the beams are made of A572 Grade 50, design the lightest (most economical) W14 x _ section that works. A steel roof beam has a double overhang and supports a DL = 50 psf and LL = 50 psf. Determine the critical bending and shear stresses that develop in the built-up section. A 2 x 6 S4S joist is nailed to each 2 x 12 as shown. # 5' 20' 5' ω = 1 k/ft A wood floor is supported by 2 x 12 S4S joists 24” on center but is in need of bolstering to increase its load carrying capacity. 2 x 6 S4S glued and nailed to the 2 x 12 S4S Problem 8. ![]() c) What is the lightest W 12 x_ size that would work? d) As an alternate, select an adequate glu-lam section. b) Design the most economical (lightest) wide flange section. A 24’ long steel girder (A572, Fy = 50 ksi) supports a uniform load plus three concentrated reactions from three beams at quarter points. Determine the critical bending stress of this built-up section. The plan is to increase the floor capacity by nailing and gluing 2 x 6 S4S joist to each 2 x 12 as shown. but is in need of bolstering since the load condition is increasing due to a change in use of the building. A wood floor is supported by 2 x 12 S4S joists 24” o. ![]() 1 grade (beams and stringers), design the most economical 6 x _ beam based on bending. The total roof dead load (including the framing weight) is 15 psf. and support a snow load of 55 psf on the 6’ overhang and 40 psf on the 12’ interior span. Determine the adequacy of a W12 x 26 (A572, Fy = 50 ksi) section based on bending. ![]() A 24’ long girder supports three equal concentrated loads at quarter points. Assuming a floor dead load of 10 psf (including the joist weight), determine the maximum permissible live load in pounds per square foot based on bending. A residential floor joist system utilizes 2 x 10 S4S’s spaced at 24” o. ![]() What is the resulting bending stress if a W 8 x 10 steel beam (A-36) is used in place of a timber section? The design load is equivalent to 60 psf and the beams span 14 feet. Check the adequacy of the beam for bending if Hem-Fir No. Timber beams, 6 x 12 S4S, are spaced at 8’-0” on centers to support a floor load in an office building. What stress would develop if the same load is applied to a 2 x 8 S4S board placed flat as a plank? supporting a dead load of 10 psf and a live load of 40 psf. Check the adequacy of a 2 x 8 S4S joist spaced at 16” o. # hinge B C hinge D Section 8 - Flexural (Bending) Stress Problem 8. Use the table below to record the number of the shear and moment diagram, respectively, that match the load diagram. The shear and moment diagrams are in a scrambled order. Load Diagram V Diagram M Diagram 1 2 3 4 5 Match the appropriate shear (V) and moment (M) diagrams for the load diagrams shown. # L Section 7 - Semigraphical Method for Load, Shear, and Moment Diagrams Using the semigraphical method, construct the load, shear, and moment diagrams for the beams shown. Use the equilibrium method to construct the shear (V) and Moment (M) diagrams for Problems 7.3 and 7.3. Section 7 - Equilibrium Method for Shear and Moment Diagrams Problem 7. ![]()
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