if the depth of compression block in the concrete at failure is 130 mm. calculate the maximum possible value of the neutral axis in mm
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- 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 cmSIT. B: Determine the tensile steel ratio of a given conditions if concrete strength f'. = 28 MPa and steel yield strength fy 4. if the tensile strain is Es = fy/Es upon crushing of concrete at a strain of 0.003. C. 0.02833 A. 0.01567 B. 0.02161 D. 0.02125 if the tensile strain is limited to 0.004 upon crushing of concrete at a strain of 0.003. A. 0.01567 B. 0.01548 5. 6. Minimum as required by NSCP 2015. C. 0.00313 D. 0.00405 A. 0.00333 B. 0.00276 = 420 MPa. C. 0.02778 D. 0.02064 uniformlyPROBLEM TO SOLVE: 600 mm 400 mm Using fe' = 28 MPa, Mmax = +320 kNm Determine the following: a. Cracking Moment (kNm) 6-25mm diam. b. Compressive Stress felt by concrete (MPa) c. Tension Stress felt by the tension bars (MPa)
- PROBLEM TO SOLVE: 600 mm 400 mm 6-25mm diam. 90 mm Using fc' = 28 MPa, Mmax = +320 kNm Determine the following: a. Cracking Moment (kNm) b. Compressive Stress felt by concrete (MPa) c. Tension Stress felt by the tension bars (MPa) d. Moment of Inertia under critical condition e. Demand Capacity Ratio of Concrete under Compression Stress f. Compression force on concrete (kN) g. Distance of the compression concrete force from the neutral axis (mm)e. Before loading, the concrete shrinks &z-conc = 0.05 (0.5%). This is less than if it were not restrained by “temperature steel", so the downdrag preloads the steel ơ2-0 = 3,000 psi. When the P = 200K is applied, estimate the final stress in the steel. %3D %3DAssuming concrete is un-cracked. Determine the cracking moment of the section. E = 2*10°MPa E = 2*10*MPa f' = 20MPA 300 mm 500 mm 3#20 60 mm1
- Determine the cracking moment for the figure shown if it is a normal weight concrete with fc=4,000psi. -24 in.- 4 in. 15 in. 22 in. 1 #11 3 in. 6 in.1) A rectangular reinforced concrete beam with dimensions b = 14 in, d = 25 in, and h = 28 in is reinforced with three No. 10 bars. Material strengths are fy = 60000 psi and fc' = 5000 psi. a. Find the cracking moment based on the uncracked transformed section b. Determine the maximum moment that can be carried without stressing the concrete beyond 0.45fc' or the steel beyond 0.6fy. Hint: Assume maximum compressive stress in the concrete to be 0.45fc' and check whether the maximum steel stress reaches 0.6fy. This way you can check which one is reached first C. Find the nominal moment capacity of the beamWhat is the stress in an 8-inch round x 16-inch high concrete cylinder (E = 2.5 x 10^6 psi) when the unit deformation is 0.0012 inch/inch? A. 500 psiB. 8100 psiC. 210 psiD. 3000 psi
- A rectangular concrete beam section, 300 mm wide by 600 mm deep, is reinforced with 4-32 mm diameter bars in the tension zone located 65 mm from the extreme tension fiber. It is also reinforced with 2-20 mm diameter bars in the compression zone also located at the same distance from the extreme compression fiber. Concrete strength F'c = 35 MPa. The yield strength of steel is 415 MPa and, the allowable stress of steel is 170 MPa. Determine the cracking moment, the elastic bending strength, and the nominal bending strength. Answer: Mcr = 88.56kN-m, Mn = 630.30KN-mA symmetrical cross-section of a reinforced concrete shown has a value of f'c = 26.27 MPa and fy = 414 MPa. Calculate the nominal capacity based on the maximum steel area for a tension- controlled condition. Use the following dimensions: b = 498 mm d = 709 mm t = 152 mm web thickness - 152 mm b 1 I dA pre-tensioned concrete member of section 200 mm x 250 mm contains tendons of area 500 mm2 at centre of gravity of the section. The pre-stress in the tendons is 1000 N/mm2.- Assuming modular ratio as 10, the stress (N/mm2) in concrete is