EXAMIANS
In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength
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According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is
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If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by
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If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is
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Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
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If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is
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In a simply supported slab, alternate bars are curtailed at
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The load stress of a section can be reduced by
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In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed
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The minimum thickness of a flat slab is taken
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