The permissible bending compressive strength for M 25 grade of concrete is 8.5 N/ mm². Its short-term and long-term modular ratios are, nearly
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- Design a one way slab (as shown in fig) for inside of a building. Normal weight aggregate concrete will be used with a density of 145pcf. Compressive strength of concrete = 4000psi Yield strength of steel = 60000psi LL = 250psfIf the elastic sag of the concrete member was 3 cm for the corresponding continuous load, what is the final total sag in consideration of additional long-term sag due to creep and dry contraction? (However, the load loading period is 10 years, and the compression reinforcement ratio p′=0.005)2. According to Section 10.2.3 of AC, the maximum usable strain at extreme concrete compression fiber shall be assumed equal to a. 0.004 b. 0.005 c. 0.003 d. 0.002 e. 0.001 f. 0.008
- The following data of a pre-stress concrete are given: Beam dimension ; bxh = 300 mm x 600 mm Loads Super imposed dead load 7 KN/m Live load = 20 KN/m Unit Weight of concrete 23 KN/cubic meter The beam is simply supported on a span of 15 meters and are pre tensioned with total initialpre tensioned with total initial force of 1750 KN from low-relaxation strand with centroid 220 mm below neutral axis throughout the beam length .There is a 15% loss of stress at service loads. The concrete covering of the pre-stressed concrete is _____mm., the total dead load is _____ KN/m.A 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 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 .
- 2.From the figure below; bending moment of 8 KN-m. The normal weight of concrete has an fc' of 26.4 MPa. solve and show the complete solution and pick the correct ans1.From the figure below; bending moment of 8 KN-m. The normal weight of concrete has an fc' of 26.4 MPa. solve and show the solutionThe properties of the reinforced concrete beam are b = 306 mm, d = 467 mm, Ast = 1007 mm2, and Est / Eco = 10. If the working stresses are 19.1 MPa for concrete and 102.2 MPa for steel, determine the largest bending moment (in Nm) that may be applied safely.
- 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 mmA reinforced concrete beam has a width of 250 mm and a total depth of 450mm. It carries an ultimate moment of 203 kN-m and has an effective depth of 375 mm. The specified compressive strength of concrete is 28 MPa and the yield strength of steel reinforcement is 415 MPa. What is the depth of the neutral axis?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)