Civil Engineering :: RCC Structures Design
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In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are:
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As per I.S. 456 - 1978, the pH value of water shall be
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The minimum number of main steel bars provided in R.C.C.
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Post tensioning system
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An R.C.C. column is treated as long if its slenderness ratio is greater than
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The width of the flange of a T-beam should be less than
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A prestressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is
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Pick up the correct statement from the following:
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. Cantilever retaining walls can safely be used for a height not more than
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If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is
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If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least
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For M 150 mix concrete, according to I.S. specifications, local bond stress, is
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If the average bending stress is 6 kg/cm2 for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, 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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The diameter of longitudinal bars of a column should never be less than
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The design of a retaining wall assumes that the retained earth
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Dimensions of a beam need be changed if the shear stress is more than
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The thickness of base slab of a retaining wall generally provided, is
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For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is
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Thickened part of a flat slab over its supporting column, is technically known as
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An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at
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The effective span of a simply supported slab, is
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Pick up the incorrect statement from the following:
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. The minimum cube strength of concrete used for a prestressed member, is
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The number of treads in a flight is equal to
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A short column 20 cm x 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2, the Safe load on the column, should not exceed
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The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm2, safe shear stress 5 kg/cm2 and B.M. 24 mt,
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In a beam the local bond stress Sb, is equal to
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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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For initial estimate for a beam design, the width is assumed
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If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
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The advantage of a concrete pile over a timber pile, is
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If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is
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If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is
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To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than
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The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon
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Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
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Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at
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The transverse reinforcements provided at right angles to the main reinforcement
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The amount of reinformcement for main bars in a slab, is based upon
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If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
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The percentage of minimum reinforcement of the gross sectional area in slabs, is
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A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is
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If T and R are tread and rise respectively of a stair, then
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If k is wobble correction factor, μ is coefficient of friction between the duct surface and the curve of tendon of radius R, the tension ratio at a distance x from either end, is
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In a prestressed beam carrying an external load W with a bent tendon is having angle of inclination θ and prestressed load P. The net downward load at the centre is
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The effective width of a column strip of a flat slab, is
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High strength concrete is used in prestressed member
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A.
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B.
A pile is a slender member which transfers its load to the surrounding soil |
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C.
A pile is a slender member which transfers its load by friction |
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D.
A pile is a cylindrical body of concrete which transfers the load at a depth greater than its width. |
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A.
\( \frac { \text{shear fore} } { \text{Lever arm *Total perimeter of reinforcement} } \) |
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B.
\( \frac { \text{Total perimeter of reinforcement} } { \text{Lever am*shear force} } \) |
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C.
\( \frac { \text{Lever arm}} { \text{shear force*Total perimeter of reinforcement}}\) |
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D.
\(\frac { \text{Lever arm} } { \text{Bendimg moment 8Total perimeter} }\) |