3. Which one of the following is not categorized as a long-term loss of pre-stress in a pre-stressed concrete member? Loss due to elastic shortening b. Loss due to creep c. Loss due to shrinkage а. d. Loss due to relaxation of steel
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- A beam 10 meters long 400mm x 600mm in cross-section is post-tensioned with a tendon 550 sq. mm. in the area and stretched to a stress of 660 KN. The tendon passed through a hole of 60mm x 70mm. The center of the hole is 75mm from the bottom. The loss of prestressing at the time of anchoring is 6%. Find the stress in the concrete immediately after prestressing.Explain in detail about stress–strain relations of randomly oriented fiber-reinforced concrete with different fiber contents.The boards for a concrete form are to be bent into a circular shape having an inside radius of 10 m. What maximum thickness can be used for the boards if the normal stress is not to exceed 7 MPa? Assume that the modulus of elasticity of the wood is 12 GPa.
- 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 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 .Why is reinforcing steel used in concrete? Discuss the typical properties ofreinforcing steel.
- A prestressed concrete beam of rectangular section 300mm wide and 600mm deep is prestressed by 5 pieces of 8mm high tensile wires at 500mm from the top and 15 pieces of 8mm diameter high tensile wires at 83 mm from the bottom. The initial stress in the wires is 1200 MPa. Estimate the loss of stress in the bottom wires due to elastic shortening of concrete. Assume modular ratio = 6.Determine the cracking moment (KN/M) and compressive stress felt by concrete (MPa). Show your solutionsA RECTANGULAR ALUMINUM BLOCK IS 40mm LONG IN THE Y DIRECTION, 20mm WIDE IN THE Z DIRECTION AND 25mm THICK IN THE X DIRECTION. IT IS SUBJECTED TO A TRIAXIAL LOADING CONSISTING OF A UNIFORMLY DISTRIBUTED FORCE OF Px=3 (COMPRESSION), Py=6 (TENSION) AND Pz=9 (COMPRESSION) IN THE X, Y AND Z DIRECTIONS RESPECTIVELY. IF THE POISSON’S RATIO = 1/4 & E = 70 GPa, DETERMINE THE STRAINS IN THE X, Y AND Z DIRECTIONS. ALSO DETRMINE A SINGLE DISTRIBUTED FORCE IN THE Y DIRECTION THE WOULD PRODUCE THE SAME X DEFORMATION AS THE ORIGINAL.
- 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 pre tensioned concrete member has a rectangular section 250 mm x 400 mm. It is concentrically prestressed with 20- 6 mm diameter high tensile wire, which is anchored to the bulkheads at a unit stress of 1035 MPa. Compute the stresses in concrete immediately after prestressing. The beam is supported throughout its length. Draw stress diagrams.fc = 25 mpa, fy = 414 the tensile stress is in the concrete is?