Anna University Chennai 2007 Bachelor of Architecture MODEL - exam paper

ANNA UNIVERSITY
B.ARCH DEGREE exam
MODEL ques. PAPER
VI SEMESTER

AR 341 DESIGN OF STRUCTURES - III

Time: 3hrs Illustrate with sketches where necessary Max: 100 Marks
Quote examples where necessary


PART A (10 x two = 20)

ans ALL ques.

1. describe a continuous beam.
2. List out the kinds of staircases based on Geometry.
3. elaborate the various failures occur in Retaining wall?
4. discuss the functions of the transverse reinforcement in a reinforced concrete column?
5. Under what circumstances a trapezoidal shape preferred to a rectangular shape for columns combined footing?
6. What is the purpose of a shear key? define its action.
7. elaborate the soil characteristics that govern the design of foundation?
8. elaborate the criteria for the diameter, number and percentage of reinforcement for the longitudinal bars in reinforced concrete rectangular columns?
9. State the limitations for calculating the bending moments and shear forces for continuous beams using the coefficients recommended in IS:456 – 2000 for plain and reinforced concrete.
10. What is the effective span of stairs with 2.5m going and supported by the landing slabs of 1.5m in the direction of the flight. The landing slabs span perpendicular to the flight at top and bottom.

PART – B (5x 16 = 80)

11. A doglegged staircase for a residential building in which the vertical distance
ranging from floor is 3.30m. The stair hall measures 2.50m x 4.50m with 12.5mm
ceiling finish. The live load on the stair may be taken as 3.0 kN/m2. Design the stair using Limit State Method.
12. a. Design a axially loaded tied square column 450mm x 450mm pinned at both
ends with an unsupported length of 3m carrying a factored load of 2000 kN. Use State Method.
Or



b. A reinforced circular column is to carry a factored load of 2300kN. The diameter of column is 600mm and effective length of column is 3.60m. The column should have a lateral reinforcement in the form of spiral. Design the column using Limit State Method.
13. a. A floor systems for an office consists of slabs over continuous beams ABC of
constant cross parts with AB = eight mts and BC = 6mts, spaced at 5mts
intervals at A,B & C on columns 300mm X 300 mm in size. If the slab that is
chosen as 175 mm, Design the beam at mid span of AB and at support B.
presume a practical width for the beam fy=415n/mm2 , fck = 20 n/mm2.
Or
b. Design a simply supported slab to cover the hall with internal dimensions
4.0m x 6.0 m. The slab is supported and on a masonry walls 230 mm thick
presume a live load of three kn/m2 and a finish load of one kn/m2. Use M 20
concrete and Fe 415 steel and finish the slab corners are free to lift up.
14. a. Design an isolated footing for an R.C. column 300 x 300mm to carry an axial
load of 600KM. Use M20 concrete, Fe415 steel and working stress method.
presume safe bearing capacity of soil as 200KN/SQM
Or
b. Design a combined rectangular footing for the subsequent data:
Two square columns of size 400mm every carry loads of 600kN and 1200kN. The footing is not to project more than 0.4m beyond the center of gravity of the 600kN. Column. The distance ranging from the centers of the column is 3m. The safe bearing capacity of soil is 400kN/m2. Use M20 concrete and Fe415 steel. Using Working stress theory.
15. a. Design the stem of a cantilever kind retaining wall with subsequent data:
The height of soil to be retained above the ground level is 4m and depth of
foundation 1m. Unit weight of soil is 18 kN/m2 and safe bearing capacity of
soil is 200kN/m2. Angle of repose of soil is 30o and angle of surcharge is
15o.The thickness of the slab is 400mm. Use Working stress theory.
Or
b. A cantilever retaining wall has a 5.50m stem. It retains earth level with its top.
The soil weighs 19kN per cubic meter and ahs an angle of repose of soil is
30o. The safe bearing capacity of soil is 200kN/m2. The coefficient of friction
ranging from the base slab and the soil is 0.6. Design the base slab using Working
stress theory.

Earning:   Approval pending.