VTU Civil Engineering (Semester 5)
Design of RCC Structural Elements
May 2016
Total marks: --
Total time: --
(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) Briefly explain under reinforced, over reinforced and balanced sections with sketches.
6 M
1(b) Explain hte following :
i) Partial safety factors for loads and materials
ii) Characteristic strength.
iii) Characteristic strength.
9 M
1(c) Clearly distinguish between working stress method and until state method of design of R.C sections.
5 M

2(a) Define Doubly reinforced beam. List the situations which require the adoption of a Doubly reinforced them.
6 M
2(b) A concrete beam has 350mm breadth and 700mm effective depth. Determine the total area of steel required if a beam subjected to factored bending moment of 600kN m. Use M20 concrete and Fe 415 grade steel. Take d1 = 50mm. Design stress strain curve data for Fe415 steel are given below
Strain Stress (N/mm2)
0.00276 351.8
0.00380 360.9
14 M

3(a) Discuss in brief short and long term deflections of R.C Beams.
6 M
3(b) A reinforced concrete beam of cross section 300mm ×600mm overall is reinforced with 3 bars of 20mm diameter HYSD o Fe415 grade on tension side with an effective cover of 50mm. Compute short term deflection at midspan consisting of service load of 20kN/m and concentrated load of 25kN at the centre of span. The beam is simply supported over a span of 5m.Use M20 grade concrete and Fe415 steel.
14 M

4 A Hall measuring 14m ×6m, beams are spaced at 3.5m c/c. The thickness of wall being 300mm. The thickness of slab is 150mm. Live load of slab is 5k/N/m2. The web (rib) width of beam is taken as 300mm. Design an intermediate T- beam. Use M15 concrete and Fe415 steel. Take d = 500mm, d1 = 50mm. Sketch the reinforcement details.
20 M

5 Design a one way slab with a clear span of inner distance 3.5m × 8m simply supported over an 230mm thick supporting wall to support a live load of 4kN/m2. Adopt M20 grade concrete and Fe415 steel Take\[ \dfrac{l}{d}=25 and\, \, d^{1}=20mm\]
20 M

6(a) Explain the design for axially loaded short columns.
6 M
6(b) Design a shot R.C column of rectangular section subjected to ultimate load of 600kN and ultimate bending moment of 100 kN.m. The column bends at major axis (x-asis). The effective length of column is 4.5m. Assume width of column as 300mm. Use M20 grade concrete and Fe415 steel. Design the lateral ties and sketch the details. Take D = 450mm and d1 = 45mm.
14 M

7 A square footing has to transfer a load of 1000kN from square column of size 400mm× 400mm. Assume M20 grade concrete and Fe415 HYSD steel Bars. Take SBC of soil = 200kN/m2. Design the footing and sketch and sketch the reinforcement details.
20 M

8 Design a dog legged stairs for an office building in a room measuring 2.8 m × 5.8m clear. Vertical distance between the floors is 3.6m. Width of flight is to be 1.25m. Allowable live load is 3kN/m2. Sketch the details of reinforcements. Use M20 concrete and Fe415 steel. Assume the stairs are supported on 230mm walls at the ends of outer edges of landing slabs. Take riser = 150mm and Tread = 300mm.
20 M

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