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Register Number SATHYABAMA UNIVERSITY (Established under section 3 of UGC Act, 1956) Course & Branch: B.E-P-CIVIL/CIVIL Title of the Paper: Reinforced Concrete Structures–II Max. Marks: 80 Sub. Code: 620602-620PT501 Time: 3 Hours Date: 10/11/2010 Session: AN ______________________________________________________________________________________________________________________ PART - A (10 X 2 = 20) Answer ALL the Questions 1. State the difference between two way slab and Doubly reinforced beam. 2. Why are two way slabs not necessary to check against shear? 3. Define Retaining Walls. 4. State the Different types of Retaining Walls. 5. Define Water Tank. 6. State the Different types of Water Tanks. 7. Define Bunkers. 8. Define Silos. 9. Define Staircases. 10. State the different types of Staircases. PART – B Answer All the Questions (5 x 12 = 60) 11. Design a simply supported roof slab for a room 10m x 3m in size for a live load of 5kN/m. Use M15 grade concrete mix and mild steel grade 1. (or) 12. Design a flat slab without drop or column head. The slab is supported on columns spaced at 4.5m c/c in both directions. Live load may be taken as 4.5kN/m2. Column size is 400mm x 400mm and storey height is 5m. Columns may be taken as fixed at their foundation levels. Use M15 grade concrete mix and mild steel grade I. 13. Design a cantilever retaining wall to retain a level earth fill of 4.5m above ground level. The surcharge on the earth fill is 15kN/m2. The angle of repose of soil is 30, unit weight of soil is 16 15 kN/m3 coefficient of friction between soils and concrete is 0.6 and the safe bearing capacity of soil is 150kN/m3. Use M15 grade concrete mix and mild steel. (or) 14. Design a counterfort retaining wall to retain earth 5 m above the basement level. The density of the earth is 16000 N/m3 and the angle of repose of soil is 30. The bearing capacity of the soil is 125kN/m2. 15. Design a circular tank resting on ground with flexible base tank 8m in diameter and 3.5 height. Use M20 grade concrete and height yield strength deformed base. (or) 16. Design an over head water tank for a capacity of 90,000 litres. Top of the tank is uncovered and bottom slab is cast monolithic with the walls. Use M20 grade concrete and high yield strength deformed bars. 17. Design the side walls and hopper bottom of a 3m x 3m square bunker to store 30 tones of coal. Density of coal is 9kN/m3 angle of repose = 30. Adopt M15 grade concrete and ribbed for steel Sketch the details of reinforced in the bunker. (or) 18. A cylindrical silo has an internal diameter of 6m and 20m deep (cylindrical portion) with a conical hopper bottom. The material stored is wheat with density of 8kN/m3. The coefficient of friction between wall and material is 0.444. The ratio of horizontal to vertical pressure is 0.4, angle of repose = 25. Design the reinforcement in side walls at hopper bottom adopt M15 (ribbed steel). Use Janssen’s theory. 19. A dog legged staircase is to be provided for a building. The vertical distance between floors in 3.3m. The space available is 2.5m x 5.0m. Design the staircase for a live load of 3kN/m2. (or) 20. An open newel staircase is to be provided in a space of 4.5m x 3.5m. The height for which staircase is to be provided is 3.3m. Design the staircase for a live load of 3.0kN/m2. Use M15 grade and mild steel grade I.