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- Use the composite beam tables and select a W-shape and stud anchors for the following conditions: Span length = 18 6 Beam spacing = 9 ft Total slab thickness = 51 2 in. (the slab and deck combination weighs 57 psf). Lightweight concrete with a unit weight of 115 pcf is used Construction load = 20 psf Partition load = 20 psf Live load = 225 psf Fy=50 ksi and fc=4 ksi A cross section of the formed steel deck is shown in Figure P9.8-9. The maximum live-load deflection cannot exceed L/360 (use a lower-bound moment of inertia). a. Use LRFD. b. User ASD.With fy = 60,000 psi, select the reinforcing for T-beam AB for the floor system shown. The live load is 80 psf, while the dead load in addition the concrete's weight is 100 psf. Concete is assumed to weigh150 Ib/ft. The slab is 4 inches thick, the effective depth is 24 inches, and the width of the web is 15 inches. A edge L beam T beams 32' 4 @ 12' = 48"Determine the numbers of rebars required for a RC beam (h=400mm, b=700mm) carrying a factored moment of 796 kPa. The concrete used has a compressive strength of 28MPa, while steel yields at 345MPa. Assume single layer of reinforcements (compression and/or tension side) and do not check for rebar spacing anymore. Other parameters: Cc = 40mm db = 20mm ds = 10mm Provide illustration if necessary and answers must be in 3 decimal places.
- Details of a rectangular column are as follows: Column width along X-axis-250 mm Column Depth along the Y-axis-600 mm 8-25 mm diameter bars distributed equally along the longer sides. 10 mm diameter ties spaced at 10 mm on centers Concrete 28th day Compressive strength, fc;=20.7 MPa Reinforcing Steel yield strength, fy-415 MPa Assume that compression steel yields. a) Which of the following gives the nominal balanced load Pb (kN). A = 90.4 mm b) Which of the following gives the nominal axial load (kN) that the column n carry at an eccentricity of 200 mm along the X axis from the centroidal Y-axis.Refer to the figure shown below. 350 Given are the following: fc 55 MPa fou 1,350 MPa Aps - 1.500 mnm2 fpy - 1,100 MPa Use bonded tendons as prestressed reinforcement. Determine the design monment capacity of the section. (kN-m)A simply supported beam is reinforced with 5-p25 mm at the bottom and 2-020 mm at the top of the beam. Concrete covering to centroid of reinforcement is 70 mm at the top and 64 mm at the bottom of the beam. The beam has a gross depth of 450 mm and gross width of 300 mm. fc'= 28 MPa, fy = 415 MPa. Assume bars laid out in single layer. Calculate the following if the limiting tensile steel strain is 0.004 for a ductile failure: Depth of the neutral axis from the extreme concrete compression fiber to the nearest whole number = mm Design strength of the beam section to the nearest whole number = kN -m Maximum service uniform live load over the entire span in addition to a DL = 20 kN/m (including the weight of the beam) if it has a span of 6 m = kN/m (to the nearest whole number)
- 2. Determine if the composite beam pictured below is adequate for this application (this includes bending, shear, deflection and shear stud limit states). The dead load for this beam is 10 psf plus the weight of the deck, which is made from normal weight concrete. I 5" 5" Normal weight slab fc=4000 psi W24x94 Span length = 30' Service Live Load = 100 psf 3/4" Diameter Shear Connectors 8' o.c. typical Fu=60 ksi (shear connectors)A two span beam subjected to shear and flexure only is reinforced as follows: SECTION @ MIDSPAN @ FACE OF SUPPORTS TOP BARS 2-∅20 mm 5-∅20 mm BOTTOM BARS 3-∅20 mm 2-∅20 mm Given: Stirrup diameter, ds = 10 mm Concrete f'c = 21 MPa Steel rebar fy = 415 MPa Stirrup fy = 275 MPa Beam size b x h = 270 mm x 450 mm Assume all bars laid out in single layer. Calculate the following: Tensile steel ratio in positive bending at midspan = __________ (in 5 decimal places) Design Moment strength of section at midspan for positive bending = ___________ kN·m (nearest whole number) Nominal Moment strength of section at face of support for negative bending = ___________ kN·m (nearest whole number)A simply supported beam is reinforced with 5-ϕ25 mm at the bottom and 2-ϕ20 mm at the top of the beam. Concrete covering to centroid of reinforcement is 70 mm at the top and 64 mm at the bottom of the beam. The beam has a gross depth of 450 mm and gross width of 300 mm. fc’= 28 MPa, fy = 415 MPa. Assume bars laid out in single layer. Calculate the following if the limiting tensile steel strain is 0.004 for a ductile failure: Depth of the neutral axis from the extreme concrete compression fiber to the nearest whole number = __ mm
- A simply supported beam is reinforced with 5-ϕ25 mm at the bottom and 2-ϕ20 mm at the top of the beam. Concrete covering to centroid of reinforcement is 70 mm at the top and 64 mm at the bottom of the beam. The beam has a gross depth of 450 mm and gross width of 300 mm. fc’= 28 MPa, fy = 415 MPa. Assume bars laid out in single layer. Calculate the following if the limiting tensile steel strain is 0.004 for a ductile failure: Depth of the neutral axis from the extreme concrete compression fiber to the nearest whole number = mm Design strength of the beam section to the nearest whole number = kN·m Maximum service uniform live load over the entire span in addition to a DL = 20 kN/m (including the weight of the beam) if it has a span of 6 m = kN/m (to the nearest whole number)As a design engineer you are asked to peer review the design done by another engineer at your organization. A typical reinforced concrete floor slab plan is given. Assume all members to be simply supported. The specified compressive strength of concrete is 5000 psi and Grade-60 steel is used. Unit weight of concrete can be assumed as 150 lb/ft³. B 30'-0"- B2 -EQ.- EQ. -EQ. SEC 1 -40'-0" IS B1 B3 B3 B1 2 The only dead load acting on the slab is the self-weight of the members. The live load on the slab is 100 psf. Initial cross-section and reinforcement details of beam B1 is shown. Area of steel is 4.8in². EQ. 40'-0" B EQ. NorthA simply supported beam is reinforced with 5-ϕ25 mm at the bottom and 2-ϕ20 mm at the top of the beam. Concrete covering to centroid of reinforcement is 70 mm at the top and 64 mm at the bottom of the beam. The beam has a gross depth of 450 mm and gross width of 300 mm. fc’= 28 MPa, fy = 415 MPa. Assume bars laid out in single layer. Calculate the following if the limiting tensile steel strain is 0.004 for a ductile failure: Maximum service uniform live load over the entire span in addition to a DL = 20 kN/m (including the weight of the beam) if it has a span of 6 m = kN/m (to the nearest whole number)