Structural Design and Drawing (RCC-II) (CE-702 (D)) - Important Questions

Design a full cantilever retaining wall to retain earth embankment 4 m height above ground level. Density of earth is 18 kN/m3 and its angle of repose is 30 degrees. The embankment is horizontal at top. Safe bearing capacity of soil is 150 kN/m2. Use M20 concrete and Fe415 steel. Check stability against sliding, overturning and bearing, and detail the stem, toe, heel and key with reinforcement.

Design a circular water tank resting on ground with rigid/integral wall-base joint. Capacity of tank is 200 kL and maximum depth of water is limited to 3.2 m. Design the wall thickness and reinforcement for hoop tension and bending, and show reinforcement detailing of wall-base junction. Use M30 concrete and Fe415 steel.

Calculate the loss of prestress in a pretensioned concrete beam of 6 m span and cross-section 300 mm x 500 mm due to elastic shortening, shrinkage, creep and relaxation. The beam is prestressed with 1550 kN force at transfer. Cable area is 1500 mm2. Assume suitable data for Es, Ec, creep coefficient, shrinkage strain and relaxation loss. Also find the final effective prestress.

Design a circular steel silo side wall of 10 m height and 4 m internal diameter to store cement of unit weight 15.50 kN/m3 and phi = 25 degrees. Determine lateral and vertical pressures by Janssen's theory, design the side wall plates and stiffeners, and sketch the details. Assume suitable data.

Discuss various factors to be considered for determination of the general dimensions of the rectangular shear walls in multistorey buildings.

Explain functions of retaining wall and components of counterfort type retaining wall with a neat sketch.

Design a rectangular water tank 5 m x 4 m with depth of storage 3 m, resting on ground and whose walls are rigidly joined at vertical edges and base and free at top. Design the long and short walls for bending moments and direct tension. Assume M20 concrete and Fe415 steel and show detailing.

Design a reinforced concrete solid slab bridge for IRC Class AA loading for the following data: clear span 8.0 m, clear width of roadway 7.5 m, average thickness of wearing coat 80 mm. Use M25 concrete and Fe415 steel. Design the slab for bending moment and shear and check for serviceability, and detail the reinforcement.

Discuss the IRC loading standards for highway bridge design - Class AA, Class A and Class B loadings and impact, wind and braking effects.

A continuous T-beam has span 10 m. Determine the flexural reinforcement at midspan for a given factored moment, span, cross-section and materials. Take flange width, web width and effective depth as per data, M25 concrete and Fe415 steel.