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Posted By: kondapalli Member Level: Gold Posted Date: 08 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Civil STRUCTURAL ENGINEERING DESIGN AND DRAWING-I(RCC) setno3 Question paper
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1. Design an end L-Beam for an office building with slab thickness of 150mm mono-
lithic with 230mm wide Beams. The spacing of the Beams are at 3.65m centre to
centre. The effective span of the Beam is 10m. Also design the Beam for shear.
Use M25 grade concrete and Fe415 grade steel. Draw the following to a suitable
scale.
(a) Longitudinal section of the Beam slowing reinforcement details
(b) The cross section of the Beam at mid span showing the reinforcement details.
2. Design a plain concrete footing for a column 300mm × 30mm carrying an axial
load of 330 kN. Assume an allowable soil bearing pressure of 360 kN/m2 at a depth
of 1.0m below ground. AssumeM20 concrete and Fe 415 steel.
Draw to scale showing
(a) Plan of the footing
(b) Nominal Reinforcement in sectional elevation
PART-B (Marks:16x3=48)
3. (a) Distinguish between static modulus and dynamic modulus of elasticity of con-
crete.
(b) Why does the code limit the compressive strength of concrete in structural
design to 0.67 fck and not fck.
4. Sketch the stress-strain curves for the following.
(a) Mild steel (Fe 250)
(b) Fe 415
(c) Fe 500.
5. Determine the shear stress in a 250 X 500 mm rectangular section if the shear force
is 20 kN and torsional moment is 10 kN.m at service loads. Asume M 20 mix and
0.75% tension reinforcement at an effective coverof 50 mm.
6. (a) Indicate how the interaction diagram for columns under continued axial load
and bending can be drawn. What are the advantages in representing it in a
non-dimensional form?
(b) Calculate the ultimate strength in axial compression of a column 400mm in
diameter and reinforced with 8 No’s 20mm of grate Fe 415 when the column
is helically reinforced by 8mm f bars at 55mm pitch. Use M20 grade concrete.
7. Design a slab (5m x 5m) restrained at edges with edge beams. Two adjacent edges
are discontinuous and the other edges are continuous. Use M 20 grade concrete
and Fe 415 grade steel.
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