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.

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 d

^{1}= 50mm. Design stress strain curve data for Fe415 steel are given belowStrain |
Stress (N/mm^{2}) |

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/m

_{2}. The web (rib) width of beam is taken as 300mm. Design an intermediate T- beam. Use M15 concrete and Fe415 steel. Take d = 500mm, d^{1}= 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/m

^{2}. 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 M

_{20}grade concrete and Fe415 steel. Design the lateral ties and sketch the details. Take D = 450mm and d^{1}= 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/m

^{2}. 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/m

^{2}. 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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