What is the distance of the neutral axis from the extreme compression concrete
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- 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 mmA rectangular beam has a width of 285 mm and an effective depth of 520mm. It is reinforced with 4 – 36 mm ø bars having fy = 430 MPa. If he compressivestrength of the concrete is 28MPa, find the following a. Location of the neutral axis from the top of the beam.b. Stress of the steel.c. Ultimate capacity of the beam?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.13. Which of the following most nearly gives the balanced steel ratio?A. 0.0493 B. 0.0439 C. 0.0394 D. 0.034914. Which of the following most nearly gives the minimum effective depth using a steel ratio equal to half the balanced steel ratio?15. Which of the following most nearly gives the minimum effective depth using the maximum steel ratio permitted by the code?A. 497.21 mm B. 518.67 mm C. 541.20 mm D. 568.18 mm
- The total compressive force at the time of failure of a concrete beam section of width 'b' without considering the partial safety factor of the material is (a) 0.36 fok b Xu (c) 0.66 fok b Xu (b) 0.54 f b Xu (d) 0.8 f b X, ck where X, is the depth of neutral axis, f cube strength of concrete. ckSITUATION B: The beam is to carry an Ultimate Moment of 580 kN-m, geometrical property of the beam are the following: width of the beam = 350 mm, total height of %3D the beam = 670 mm , steel cover = 50mm. Use concrete strength f'c=21 MPa, steel %3D yield strength fy = 415 MPa and Ø = 0.877 %3D 4. What is the minimum number of 28-mm diameter reinforcing bars needed in the tension zone?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.m
- A rectangular concrete beam has a width of 400 mm and an effective depth of 700 mm. It is reinforced with five 28-mm diameter bars for tension only. Concrete strength is f's = 21 MPa and steel yield strength is fy = 275 MPa. Which of the following most nearly gives the distance of the neutral axis from the extreme compression concrete? A. 139.51 mm B. 151.93 mm C. 118.58 mm D. 188.15 mmDetermine 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.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 !!
- Given the properties of a reinforced concrete beam with section below: Unit weight of concrete = 24 kN/m3 %3D • Concrete compressive strength = %3D 34.5 MPa Steel yield strength = 420 MPa %3D b = 250 mm ; width of the beam h = 500 mm ; depth of the beam %3D %3D Steel area = 4-28 mm o Diameter of stirrups 12 mm %3D Calculate the following: 1. Reduction factor o 2. Moment Capacity (nominal) of the beam in kN-m 3. Assuming the beam to be simply supported with 7 m span, determine the maximum concentrated dead load that it can carry at midspan along with it's self-weight in kNSituation C: A rectangular beam has a concrete strength of 24 MPa. The yield strength of the reinforcing bars is 300 MPa. Width of the beam = 350 mm. %3D 65 mm 2 - 25 mm e 435 mm 5 - 36 mm e 350 mm 7. What is the depth of compression block in mm?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.