Problem (1): For the 4-point bending test of the beam and x-section shown below, at failure...

 

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Problem (1): For the 4-point bending test of the beam and x-section shown below, at failure the strain recorded in the tension steel was, E+ = 0,0029805 and the crushing concrete strain was to-0.003. Knowing that fe22 MPa, fy-550 MPa, Es-2.1x105 MPa, Ec-23360 MPa, and f-3.25 MPa. Assume one layer of steel. Answer the following: 1. Has the tension steel yielded? 2. Calculate the steel area provided in the section to develop the above strains. 3. Calculate the load at failure. 4. Calculate the design load P. Assume P is considered as a dead load. 5. Is the failure considered tension controlled? If not find the maximum area of steel so that the failure is tension controlled. 6. The technician conducting the test claimed that the strain in the extreme tension fiber of concrete was recorded as 0.0002 before the first crack occurred do you agree with him? Explain your answer. POLKN * 0.015x2+1.1 m 4.0 m + POLKN 20m * 0.015x2+1.1 m Problem(2):- For the entire beam below determine b, h, and A. (use p18). Assume the following: fy=420 MPa, fe'=25 MPa, d=2 b, p=0.70 pmax(for Maximum moment only), cover-40 mm, 10 stirrups and E.-210 GPa. Ignore beam weight. w 10+0.1x2 kN/m W-33-0.1xZ kN/m 700 mm 6.0m 350 mm 2.0m d-634 mm 1 Problem (1): For the 4-point bending test of the beam and x-section shown below, at failure the strain recorded in the tension steel was, E+ = 0,0029805 and the crushing concrete strain was to-0.003. Knowing that fe22 MPa, fy-550 MPa, Es-2.1x105 MPa, Ec-23360 MPa, and f-3.25 MPa. Assume one layer of steel. Answer the following: 1. Has the tension steel yielded? 2. Calculate the steel area provided in the section to develop the above strains. 3. Calculate the load at failure. 4. Calculate the design load P. Assume P is considered as a dead load. 5. Is the failure considered tension controlled? If not find the maximum area of steel so that the failure is tension controlled. 6. The technician conducting the test claimed that the strain in the extreme tension fiber of concrete was recorded as 0.0002 before the first crack occurred do you agree with him? Explain your answer. POLKN * 0.015x2+1.1 m 4.0 m + POLKN 20m * 0.015x2+1.1 m Problem(2):- For the entire beam below determine b, h, and A. (use p18). Assume the following: fy=420 MPa, fe'=25 MPa, d=2 b, p=0.70 pmax(for Maximum moment only), cover-40 mm, 10 stirrups and E.-210 GPa. Ignore beam weight. w 10+0.1x2 kN/m W-33-0.1xZ kN/m 700 mm 6.0m 350 mm 2.0m d-634 mm 1

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Problem 1 Answer For part 4 you have ... View the full answer