A rectangular beam having b=250mm and d=480mm is reinforced with five 25-mm diameter tension bars. If fc'=21MPa and fy=345MPa, what is the design flexural strength? Use 2001 NSCP
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Find the design flexural strength ?
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- 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)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 = __ mmA 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)
- 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: 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)A simply supported beam is reinforced with 4-ø28 mm at the bottom and 2-ø20 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 limitin tensile steel strains 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)Problem 1. The composite beam shown below carries a cantilevered load of 10 kN. The beam consists of one 30 x 124 mm plate and four 12 x 50 mm plates. They are pinned together at 120 mm intervals with round pins. The pin material has a shear strength of 159 MPa. Compute the minimum acceptable diameter for the pins. O O O O O O O -0 O 0- O 1000 mm Do O -120 mm (typ) O O O P = 10 KN 30 x 124 mm 12 x 50 mm (typ)
- AW18 x 40 standard steel shape is used to support the loads shown on the beam. Assume P = 19 kips, w = 3.8 kips/ft, LAB = 5.2 ft, LBc = 5.2 ft, and LCD= 14.4 ft. Determine the magnitude of the maximum bending stress in the beam. %3D D B LAB LBC LCD Answer: ksi OmaxThe beam has a cross section shown in the figure. fc’ = 26 MPa, fy = 390MPa, determine the following:a. The minimum steel area permitted by the NSCP Specs.b. The flexural design strength Mu if it is reinforced with minimum steelarea.c. The maximum area of flexural steel that can be used in reinforced thesection.In order to reinforce a column in an existing structure, two channels are continuously welded to the column as shown below. Fy = 50 ksi for both the column and the channels. The effective length with respect to each axis is 16 feet. a) calculate the Moment of Inertia about each axis of the built-up shape. a) what is the available axial compressive strength and what is the percentage increase in strength? Use both LRFD and ASD.
- AW18 x 40 standard steel shape is used to support the loads shown on the beam. Assume P = 18 kips, w = 4.6 kips/ft, LAB = 3.4 ft, LBc = 3.4 ft, and LCD= 16.6 ft. Determine the magnitude of the maximum bending stress in the beam. A P Answer: Omax LAB = B Save for Later LBC eTextbook and Media C ksi W LCD D X Attempts: 0 of 3 used Submit AnswerAW18 x 40 standard steel shape is used to support the loads shown on the beam. Assume P = 21 kips, w = 3.0 kips/ft, LAB = 3.0 ft, LBC = 3.0 ft, and Lcp = 14.2 ft. Determine the magnitude of the maximum bending stress in the beam. A #1 LAB Answer: Omax = i B LBC C ksi W LCD D XAW18 x 40 standard steel shape is used to support the loads shown on the beam. Assume P = 28 kips, w = 3.8 kips/ft, LAB = 4.6 ft, Lec = 4.6 ft, and Lco = 15.0 ft. Determine the magnitude of the maximum bending stress in the beam. %3D %3D B |C D LAB LBC LCD Answer: Omax = ksi