Civil Engineering :: RCC Structures Design
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A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
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The weight of a foundation is assumed as
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The maximum shear stress (qmax) in a rectangular beam is
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For stairs spanning horizontally, the minimum waist provided is
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Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of
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If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
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The live load to be considered for an inaccessible roof, is
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If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm2, the share stirrups are provided for a distance x from either end where x is
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The radius of a bar bend to form a hook, should not be less than
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With usual notations the depth of the neutral axis of a balanced section, is given by
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In a simply supported slab the minimum spacing of distribution reinforcement, should be four times the effective thickness of the slab or
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A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is
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If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by
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An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is
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If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a
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The toe projection of foundation slabs is taken
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For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is
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Steel beam theory is used for
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The advantage of reinforced concrete, is due to
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The shear reinforcement in R.C.C. is provided to resist
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An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm φ placed symmetrically along the circumference. If it carries a load of 40, 000 kg axially, the stress is
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According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
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The width of the rib of a T-beam, is generally kept between
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Pick up the true statement from the following:
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A pile of length L carrying a uniformly distributed load W per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is
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If bending moment is M, shear force is F effecive depth is d, lever arm is la area of reinforcement is As and sum of the circumferences of main reinforcement is 0, the bond stress based on working stress method, is
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The horizontal portion of a step in a stairs case, is known as
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The length of lap in tension reinforcement should not be less than the bar diameter x (actual tension / four times the permissible average bond stress) if it is more than
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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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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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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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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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If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than
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Distribution reinforcement in a simply supported slab, is provided to distribute
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To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is
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The thickness of the topping of a ribbed slab, varies between
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To ensure uniform pressure distribution, the thickness of the foundation, is
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Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to
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In a singly reinforced beam, the effective depth is measured from its compression edge to
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If a rectangular prestressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be
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The depth of the centre of gravity (y) of the resultant compressive stress from the compression edge of the T-beam specified in Q. 13.52 is given by
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If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm2, the length of the beam having nominal reinforcement, is
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If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than
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If the depth of actual neutral axis of a doubly reinforced beam
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The length of the straight portion of a bar beyond the end of the hook, should be at least
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A simply supported beam , 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is
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If p1 is the vertical intensity of pressure at a depth h on a block of earth weighing w per unit volume and the angle of repose φ, the lateral intensity of pressure p2 is
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A pile of length L carrying a uniformly distributed load W per metre length is suspended at the centre and from other two points 0.15 L from either end ; the maximum hogging moment will be
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Distribution of shear intensity over a rectangular section of a beam, follows :
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A.
is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier |
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B.
is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier |
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C.
is equal to the depth of critical neutral axis, the concrete and steel attain their maximum stresses simultanesouly |
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D.
all the above. |