Concrete-structures Questions Set 18:
Maximum permitted spacing of main bars in a slab is :
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Bond strength in bottom bars of RCC structure is
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In working stress method which failure criteria is considered?
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Which effects in the working stress method of design are ignored?
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The maximum spacing of vertical reinforcement in reinforced concrete (RCC) walls should NOT exceed:
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What is the maximum slenderness ratio for a steel member subjected to compression force resulting only from combination with wind/earthquake actions, provided the deformation of such members does not adversely affect the stress in any part of the structure?
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A prestressed concrete rectangular beam of size 300 mm 900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350 mm at midspan. Stress at the top beam section due to prestress alone, in N/mm² is
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In a prestressed concrete beam section shown in the figure, the net loss is 10% and the final pre-stressing force applied at X is 750 kN. The initial fibre stresses (in N/mm2) at the top and bottom of the beam were
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A single reinforced concrete beam of size 300*450 mm2 has 3 bars with a diameter of 15 mm and is made of M20 grade concrete and Fe 415 grade reinforcing steel. The depth of the neutral axis of the beam is -------------------(As per IS 456:2000)
Note: answer must be rounded to one decimal
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A pre-tensioned rectangular concrete beam 150 mm wide and 300 mm depth is prestressed with three straight tendons, each having a cross-sectional area of 50 mm2, to an initial stress of 1200 N/mm2. The tendons are located at 100 mm from the soffit of the beam. If the modular ratio is 6, the loss of prestressing force (in kN, up to one decimal place) due to the elastic deformation of concrete only is_______.
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