RCC Structures Design Questions

• In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as
• For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed
• Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
• The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
• A pile weighing W1 kg penetrates S metres with its last blow. If W2 is the weight of the hammer having a drop of H metres, the pile can carry a maximum external load
• Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory
• The minimum head room over a stair must be
• An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, the beam
• The diameter of the column head support a flat slab, is generally kept
• According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than
• If W is the uniformly distributed load on a circular slab of radius R fixed at its ends, the maximum positive radial moment at its centre, is
• If p is the net upward pressure on a square footing of side b for a square column of side a, the maximum bending moment is given by
• If the tendon is placed at an eccentricity e below the centroidal axis of the lon-gitudial axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge
• The steel generally used in R.C.C. work, is
• If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept
• If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p1, is :
• Steel bars are generally connected together to get greater length than the standard length by providing
• A very comfortable type of stairs is
• The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.
• If permissible compressive stress in concrete is 50 kg/cm2, tensile stress in steel is 1400 kg/cm2 and modular ratio is 18, the depth d of the beam, is