VTU Civil Engineering (Semester 6)
Design & Drawing of RCC Structures
June 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 A simply supported two way slab is supported on all the sides by a 230 mm thick wall. The dimensions of the two-way slab is 4.5m × 5.5m (clear). Following are the details of reinforcement.

Draw to suitable scale:
i) Thickness of slab =150 mm
ii) Along short span = #[email protected] 130 mm c/c
iii) Along longer span = #[email protected] 110 mm c/c
iv) Negative steel for shorter span = #[email protected] 260 mm c/c 1.20 m long
v) Negative steel for longer span = #[email protected] 220 mm c/c 1.430 m long
vi) Alternative rods are bent up cranked  
vii) Corner mats are #[email protected] 120mm c/c at top and bottom, in two layers on all the corners for a distance of 0.950 m on either side
viii) Use M20 grade concrete and Fe415 grade steel

a) Plan showing reinforcement details.
ii) c/s at midspan along shorter span.
iii) c/s at midspan along longer span.
20 M

2 A RCC doglegged staircase has the following details:
i) Staircase hall size (clear) =2.3m × 4.7m
ii) Floor to floor height = 3.3 m
iii) Rise - 150 mm and tread = 250 mm
iv) Waist slab thickness = 150 mm
v) Width of stair = 1.10m
vi) Bearing = 230 mm
vii) Number of steps per flight = 10
viii) Main steel =#[email protected] 250 mm c/c
ix) Distribution steel = #[email protected] 275 mm c/c

Two landing beams of size 230mm&tims;250mm are provided with 2-#12 at bottom and top Stirrups are #[email protected] c/c throughout.
Draw to a suitable scale:

a) Plan
b) Sectional elevation along second flight
c) Bar bending schedule.
20 M

3 A rectangular RCC column and footing has the following details:
Column size = 400mm × 600mm
Size of footing = 2m × 3m of uniform thickness 420 mm
Depth of foundation below GL = 1m
Height of column to be shown above GL =1 m

Details of reinforcement
Column :8-#16 as main bars with #[email protected] 150 mm c/c lateral ties
Footing: along length :#[email protected] 130 mm c/c
Along width (central band) :#[email protected] 220 mm c/c
Use M20 concrete and Fe415 steel

Draw to suitable scale, the following:

a) Sectional plan of column and footing
b) Sectional elevation of column and footing
c) Prepare bar bending schedule for footing steel and column steel up to 1m above GL.
20 M

4 Design a slab and beam type combined rectangular footing for two columns located 4.0 m apart. The columns 300mm × 300mm and 500mm × 500mm in size carry axial service loads of 600 kN respectively. The property line is 0.5 m from the centre line of first column. Safe bearing capacity of soil is 150 kN/m2. Use M20 concrete and Fe415 grade steel.
Draw to a suitable scale:
i) Longitudinal section of the footing.
ii) Cross section of the footing.
60 M

5 (a) Design a RCC portal frame an effective span of 8.0 m and effective height of 4.0m. The portals are spaced at 3.5 m c/c. The imposed load on slab is 2.0 kN/m2. Assume SBC of soil as 200 kN/m2. The bases of columns are fixed. Use M20 concrete and Fe415 steel. Design the continuous slab, portal frame and foundation.
40 M
5 (b) Draw to a suitable scale the sectional elevation of half the portal frame showing the details of steel in beam, column and footing. Also show the cross-sectional details of beam at midspan and support and the sectional details of column.
20 M



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