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Posted By: Nitin Bajaj - Editor Member Level: Diamond Posted Date: 14 Apr 2008
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2007 Jawaharlal Nehru Technological University B.Tech STRUCTURAL ENGINEERING DESIGN AND DRAWING-I(RCC) (Civil Engineering) Question paper
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III B.Tech I Semester Regular Examinations, November 2007 STRUCTURAL ENGINEERING DESIGN AND DRAWING-I(RCC) (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any ONE Question from PART-A and any THREE Questions from PART-B Note:Assume suitable data whenever necessary Use of IS codes & Structural Tables is permitted ????? PART-A(Marks:32)
1. Design the Flexural Reinforcement for the Rectangular concrete Beam of size 250 mm ×400mm simply supported an two marmarry walls 230mm thick and 6m apart. The Beam has to carry in addition to its own weight, a distributed live load of 10kN/m, dead load of 5 kN/m and a concentrated dead load of 30kN placed at the mid span point. Assume that the Beam in subjected to moderate exposure conditions and grade of steel Fe 415 used. Draw suitable scale longitudinal section and cross section of the Beam
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. How does the strength of concrete vary with age? What is modulus of rupture? How can the tensile strength of concrete be determined?
4. What is meant by limit state? Discuss the di?erent limit states to be considered in reinforced concrete design.
5. What is meant by bundling of bars ? What is the maximum number of bars that can contribute to a bundle ? What are the speci?cations regarding development length of bundled bars ?
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. A 5 span continuous one way slab is to be used for a school building. The supporting beams are spaced 3m c/c. Design the slab using M 20 grade concrete and Fe - 415 grade TOR steel for a live load of 3kN/m2 .
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