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- 3.) A reinforced concrete beam 300 mm width has an effective depth of 450 mm. it is reinforced with 6-32mmØ at the tension side and 2-28 mmØ at the compression side located at 65 mm from the top. f= 34.5 MPa and fy 345 MPa. Assume all steel yield and the contribution of compression steel may not be neglected. (NSCP 2001) a. Find the balanced steel ratio in percent? = b. Find the depth of compression stress block. c. Find the nominal moment capacity of the beam.A reinforced concrete beam has has a width of 250 mm and total depth of 500mm. The beam will design to carry a factored moment of 540kN.m. Concrete strength fc'=28MPa and steel yield strength fy=248MPa. Solve using the strength design. Determine the balanced steel ratio in percent.A simply supported concrete beam 6m long is reinforce with four-28 mm diamgram tension bars. The beam has a width of 300mm and over all depth of 400.the steel covering to the centroid of the renforcement is 70 mm fc=30mpa and fy 418mpa A .draw a stress diagram B.compute for the ultimate capacity of the beam
- Subject: Reinforced concrete Design- Civil Engineering A simply supported rectangular beam has a width of 300mm and the distance to the centroid of tension reinforcement is 330mm. The tension reinforcement has an area of 2463mm.2 and the area of compression reinforcement placed 70mm from the compression face of the beam is 1231.5mm.2, fy = 415MPa, fc'=30MPa, balanced steel ratio of 0.031.The design strength using 0.90 as the reduction faction is Choices A. 282kN.m B. 245kN.m C. 254kN.m D. 228kN.mDetermine the prestressing force required for the precast concrete T-beam. Use the following data: Total moment = 250 kN-m Effective stress fse= 862 MPa Allowable concrete stress = f =11 MPa Consider zero stress at the bottom of the beam I=3673x106 mm A=103125 mm2 Eccentricity = 271.6 mm Centroid of steel is located at 100 mm from the bottom of the beam.SITUATION 8: A rectangular concrete beam having a width of 300 mm is reinforced for tension only. The beam carries a factored moment of 540 kN-m. Concrete strength is f’c = 28 MPa and steel yield strength fy = 280 MPa.25. Which of the following most nearly gives the balanced steel ratio? a. 0.0349 b. 0.0439 c. 0.0394 d. 0.0493 26. Which of the following most nearly gives the minimum effective depth using a steel ratio equal to half the 582.50 sqm balanced steel ratio? a. 611.15 mm b. 675.38 mm c. 640.91 mm d. 582.50 mm27. Which of the following most nearly gives the minimum effective depth using the maximum steel ratio permitted by the code? a. 541.20 mm b. 497.21 mm c. 568.18 mm d. 518.67 mm
- Situation 17: A rectangular beam has a width of 300mm and an effective depth to the centroid of the tension reinforcement of 600mm. The tension reinforcement has an area of 4762mm2 and the area of compression reinforcement placed 62.5mm from the compression face of the beam is 987.5mm2 fy=414.6 MPa, fc’=34.56 MPa. Balanced steel ratio is 0.034. Assume that steel yields. Determine the depth of compression block. Determine the design strength. Determine the concentrated live loads at the midspan in addition to a dead load of 20kN/m including the weight of the beam if it has a span of 6m.ANALYSIS OF DOUBLY REINFORCED CONCRETE BEAM. Compute the flexural strength of the beam. Given: fc’ = 28 MPa fy = 414 MPa b = 300 mm d = 500 mm As = 4 – 25 mm ø As’ = 2 – 25 mm ø3. A concrete floor slab 100 mm thick is cast monolithic with concrete beams 2.0 m on centers. The beams have a span of 4.2 m, web width of 250 mm and overall depth of 450 mm. The tensile reinforcement consists of 4-∅25 mm bars in two rows with 25 mm vertical clear spacing. Use material strengths f’c = 21 MPa and fy = 415 MPa. Calculate the following considering a T-geometry: a. Effective flange width of an interior beam in mm =____? ____ b. Depth of uniform stress block at ultimate stage in mm to the nearest whole number = ____?____ c. Tensile steel strain compatible with concrete strain of 0.003 in 3 decimal places =____?_____
- USE NSCP 2010 A reinforced rectangular concrete beam has a width of 250 mm and aneffective depth of 360 mm. It is reinforced for tension only at the bottomwith a total tension steel area of 600 mm². fc’ = 40 MPa, fy = 400 MPa. a. Determine the tension reinforcement index for this beam.b. Determine the distance of the neutral axis below the compressionsurface. c. Determine the ultimate flexural strength of the beam.A rectangular beam 250 mm wide, 500 mm deep is reinforced at the bottom with 4-20-mm-diameter bars and at the top with 2-16-mm bars. The concrete cover to bar centroid is 80 mm and at the bottom is 70 mm. use concrete strength f'= 21 MPa and steel yield strength fy=415 MPa for all bars. 1. Determine the tensile steel ratio when the beam is in positive bending. a. 0.01567 b. 0.01283 c. 0.01169 d. 0.01923 2. Determine the nominal moment capacity in kN-m of the beam in positive bending. a. 188.30 b.167.70 c.218.96 d.193.68 3. Determine the tensile steel ratio when the beam is in negative bending. a. 0.00406 b. 0.00475 c.0.00383 d. 0.00508 please provide a complete solution so I can understand. Very much appreciated to solve it early !!A reinforced concrete beam has a width of 300 mm and effective depth of 500mm to the centroid of the tension reinforcements. Consider the steel reinforcements will be placed in a single layer arrangement. Concrete strength fc’ = 34.5 MPa. Determine the steel ratio of the section if the beam is singly reinforced with the maximum amount of steel for transition control allowed by the Code if the bars has a steel strength of fy = 345 MPa. Determine the steel ratio of the section if the beam is singly reinforced with the maximum amount of steel for tension control if the bars has a steel strength fy = 345 MPa. Determine the number of pieces of 28 mm ᴓ bars required for the section if the beam is singly reinforced with the maximum amount of steel for tension control if the bars has a steel strength fy = 415 MPa.