The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth are 62.5 kg/cm² and 250 kg/cm² If m= 15, the depth of its neutral respectively. axis is
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- PART B 2. (a) What is the criterion of failure of reinforced concrete flexural elements? What distribution of compressive stress is normally assumed across the compression zone of a reinforced concrete beam, and how does this compare to the actual stress distribution? (b) Obtain the ultimate moment of resistance of the beam section indicated in Figure 2, if the grade of the concrete used in the section is 35N/mm?, and the yield stress of the steel is 500N/m2 s) 750 6T20 350 ST25 6T25 200 Figure 2A rectangular reinforced concrete beam has a width of 350 mm and an effective depth of 650 mm. The beam is reinforced with 8-28 mm diameter tension bars. Concrete strength is f'c = 20.70 MPa and steel yield strength is fy = 275 MPa. 1. Which of the following most nearly gives the steel ratio? A. 3.73% B. 2.79% C. 2.17% D. 1.62% the rectangularA concrete specimen with b = d is supported at both ends 600mm apart. It is tested for flexure strength with load at midspan of 100kN and failed with a flexural stress of 52.083 MPa. What is the dimension b and d of the specimen in mm?
- A rectangular concrete beam of width 120 mm and depth 200 mm is prestressed by pre-tensioning to a force of 150 kN at an eccentricity of 20 mm. The cross-sectional area of the pre-stressing steel is 187.5 mm2. Take modulus of elasticity of steel and concrete as 2.1 x 105 MPa and 3.0 x 104 MPa respectively. The percentage loss of stress in the pre-stressing steel due to elastic deformation of concrete is2. A reinforced concrete column 300 mm in diameter supports an axial compressive force of 500 kN. Determine the required area of reinforcing steel that will satisfy the following conditions: allowable stress for steel is 120 MPa whereas for concrete, the stress is limited to 6 MPa. Use Et = 200 GPa and Econ = 14 GPa.A cylindrical block of concrete is 300mm long and has a circular cross section of 100mm in diameter. It carries a total compressive load of 67KN and under this load contract 0.2mm. Estimate the compressive stress and strain .
- solve the following problems 1. A concrete has a height of 5 meters and has unit area of 3 m². It supports a mass of 30,000 kg. Acceleration due to gravity (g) = 9.81 m/s². Young's modulus of concrete = 20x 10¹ N/m² Determine (a) the stress (b) the strain (c) the change in height.Assuming concrete is uncracked. Compute the bending stress in the extreme fiber of the beam of figure for bending moment 1x10°kg cm . Determine the cracking moment of the section. A = 10cm² %3D E, = 2*10°kg / cm² E = 2*10°kg / cm² %3D %3D f'. =1836kg / cm² %3D 90 cm 100 cm 40 cmA simply supported concrete rectangular beam has a cross-sectional dimension of 200mm x 300mm and length L=(3 + 21/5)m, is to be analyze in flexure, unit weight of the beam is 24kN/m^3. Concrete properties: f'c=28MPA, normal weight concrete, Es=200000MPA
- a concrete column base is circular, with a diameter of 8 in, and carries a direct compressive load of 70000 lb. compute the compressive stress in the concreteA center point loading is used to test concrete for flexure. The sample is 150mm x 150mm and has a clear span of 600mm. The sample failed when the load applied is 100,000N. What is the flexure stress at failure in MPa?Determine the tensile steel ratio of a singly reinforced concrete beam for the following conditions using concrete strength f’c = 28 MPa and steel yield strength fy = 420 MPa. if the tensile strain is εs = fy/Es upon crushing of concrete at a strain of 0.003. = ___ (5 decimal places)