Anna University Chennai 2005 B.E Civil Engineering CE337 – STRUCTURAL DESIGN – II - Question Paper

CE337 – STRUCTURAL DESIGN – II

Time : 3 hours Maximum : 100 Marks

ans ALL ques.
Use M20 concrete and Fe 415 steel for all issues
Part – A (10 x two = 20 marks)

1. Define moment of resistance.
2. What are the 3 factors must be considered while designing a water retaining structure?
3. Distinguish ranging from characteristic strength and design strength.
4. What are the magnitudes of crack width allowed in concrete structures for different environments?
5. What are the effects of shear in RC beams?
6. Distinguish ranging from flexural bond and anchorage bond.
7. Define Slenderness ratio of column. How columns are classified based on this ratio?
8. Distinguish ranging from braced and unbraced column.
9. Under what circumstances is a trapezoidal shape preferred to a rectangular shape for a 2 column combined footing?
10. Define cavity wall and shear wall.

Part – B (5 x 16 = 80 marks)

11. (i) elaborate the advantages of limit state method over other methods? (4)
(ii) Design a RC rectangular beam by working stress method for a simply supported span of 5m and carrying a superimposed load of 20 kN/m inclusive of its self weight. Take width of beam as 300 mm. (12)

12. (a) (i) elaborate the assumptions made in analysis and design of flexural members for Limit state of collapse? (4)
(ii) Design a T-beam by Limit state approach for a span of 6m simply supported a their ends by 300mm. The beams are spaced at 3.5m centre to centre. The live load on the slab is three kN/m2. (12)

(OR)

(b) (i) Write the design procedure for deflection control of beams. (4)
(ii) Design a 2 way slab of 2m x 3m by Limit state method, simply supported on all 4 sides. The thickness of wall is 200mm. The corners of the slab are not held down. It has to carry a characteristic live load of 10 kN/m2. (12)

13. (a) (i) What is mean by development length? In what places development length of bars in tension should be checked? (4)
(ii) A T-beam of flange size 700 mm x 120 mm and web size 350 mm x 680 mm is subjected to factored bending moment of 215 kN-m, factored shear of 150 kN and factored torsion of 105 kN-m. Design the reinforcements by using Limit state method. Take cover to centre of steel as 50mm. (12)
(OR)
(b) (i) What is mean by anchorage of steel bars? elaborate the IS provisions for providing anchorages for shear reinforcement? (4)
(ii) A doubly reinforced simply supported rectangular beam of 250 mm x 450 mm effective size carries a characteristic imposed load of eight kN/m. The clear span of the beam is seven m. It is reinforced with four numbers of 16mm dia bars in the tension zone and three numbers of 16mm dia bars in compression zone throughout its length. Taking partial safety factor as 1.5, design the shear reinforcement. (12)

14. (a) (i) Draw and discuss the interaction diagram of columns. (4)
(ii) Design a column of 400 mm x 600 mm size carrying factored load = 1600 kN, factored moment (major axis) = 120 kN-m and factored moment (minor axis) = 90 kN-m. Take d’=60mm. (12)
(OR)
(b) (i) discuss the behaviour of tied column and spiral column subject to axial loading. (4)
(ii) Design a biaxially eccentrically loaded braced rectangular column of size 300 mm x 480 mm subjected to factored axial load of 1000 kN and factored moments of 80 kN-m and 30 kN-m with respect to major and minor axis respectively at the top end. presume the column is bent in single curvature. Take factored moments with respect to major and minor axis as 110 kN-m and 40 kN-m at the bottom end. The unsupported length of column is 5.8 m and effective length in long and short directions are 5.4m and 4.2m. (12)

15. (a) (i) discuss briefly the load transfer mechanism in 2 column combined footing. (4)
(ii) Design an isolated footing for a column 300mm x 500 mm reinforced with six numbers of 25 mm dia bars subject to a factored axial load of 1000 kN and a factored uniaxial moment of 120 kN-m at the column base. presume that the moment is reversible. The safe bearing capacity of soil may be taken as 200 kN/m2 at a depth of 1.25 m. (12)
(OR)
(b) (i) describe effective thickness of a wall. How the effective thickness can be taken for solid
walls, cavity walls and cross walls. (4)
(ii) Design an interior brick masonry cross wall of a storey building to carry 100 mm thick RCC slab with 3m ceiling height. The wall is unstiffened and it supports 2.65 m wide slab. Take Live load on roof = 1.5 kN/m2. Live load on floor = 2.0 kN/m2. (12)

Earning:   Approval pending.