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VTU Civil Engineering (Semester 6)
Design & Drawing of RCC Structures
June 2015
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 sides by 230 mm thick wall. The dimensions of way slab is 3mts × 4 mts (clear). Following are the reinforcement particulars:
i) Along short span ϕ 10 mm @ 125 mm c/c
ii) Along long span ϕ 10 mm @ 150 mm c/c
iii) Negative steel for short span ϕ 10 mm @ 250 mm c/c
iv) Negative steel for long span ϕ 10 mm @ 300 mm c/c.
v) Alternative rods are cranked
vi) Corner mats are &straighphi; 8mm @ 150 mm c/c along short span and ϕ 8 mm @ 200 mm c/c along long span
vii) Thickness of slab is 150mm
Draw to a suitable scale:
a) Plan showing reinforcement particulars.
b) Cross section at mid span along short span.
c) Cross section at mid span along long span.
20 M

2 A dog legged staircase is proposed for a building with the following data:
i) Clear dimension of stair hall ( 2.5 × 5 m)
ii) Vertical distance between the floors 3.6 m
iii) Thickness of waist slab is 150 mm
iv) Wall thickness is 230 mm
v) Main reinforcement ϕ 12 mm @ 100 mm c/c
vi) Distribution reinforcement ϕ 8 mm @ 150 mm c/c
Draw to a suitable scale:
a) Plan of staircase
b) Sectional elevation of first which starts from foundation showing reinforcement details.
Sectional elevation of second flight.
20 M

3 A rectangular RCC column and footing have the following details:
i) Dimension of column - 230mm × 450 mm
ii) Size of footing - 1.2m × 1.5m
iii) Depth of footing at the face of column 450mm
iv) Depth of footing at the edges 150 mm
v) Depth of foundation below ground level is 1.2 m
vi) Details of reinforcement
Column: ϕ 16mm - 8 nos as main bars ϕ 8 mm @ 150 mm c/c as lateral ties
vii) Footing: 10 mm ϕ @ 90 mm c/c - shorter direction 10 mm ϕ @ 120 mm - longer direction
Draw to a suitable scale:
a) Sectional plan of column and footing
b) Sectional elevation of column and footing
c) Prepare the bar bending schedule for footing steel and column steel up to 3 m height above ground level.
20 M

4 Design a slab type rectangular combined footing for supporting two columns 400mm × 400mm in size to carry a load of 1000 kN each. Center to center distance between the column is 3.5m. The projection of footing on either side of the columns with respect to center of columns is 1m. Safe bearing capacity of soil can be taken as 190 kN/m2. Use M20 grade concrete and Fe415 grade Steel.
Draw to suitable scale:
a) Plan of footing.
b) Longitudinal section of footing
c) Transverse section of footing.
60 M

5 Draw a single bay portal frame an effective span of 7 m and an effective height of 4m. The portal frames are spaced at 3.5m c/c. Take live load as 1.6 kN/m2 on the slab. Assume safe bearing capacity of soil as 120 kN/m2. Use M20 grade concrete and Fe415 Steel. Design the beam, column and footing.
Draw to a suitable scale:
a) Sectional elevation of half the portal frame.
b) Cross - Sectional details of column
c) Cross - sectional details of beam at support and midspan.
60 M

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