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Posted Date: 14 Dec 2007 Posted By:: Sri Member Level: Gold Points: 5 (₹ 1)

2006 Jawaharlal Nehru Technological University, Hyderabad B.Tech Civil Engineering III/Sem1 Regular (NOV)Set 1,STRUCTURAL ENGINEERING DESIGN AND DRAWINGI(RCC) Question paper
Code No: RR310103 Set No. 1 III B.Tech I Semester Regular Examinations, November 2006 STRUCTURAL ENGINEERING DESIGN AND DRAWINGI(RCC) (Civil Engineering) Time: 3 hours Max Marks: 80 Answer any ONE Question from PARTA and any THREE Questions from PARTB Note:Assume suitable data whenever necessary Use of IS codes & Structural Tables is permitted PARTA(Marks:32) 1. Design the Flexural Reinforcement for the Rectangular concrete Beam of size 250mm ×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 of10kN/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 an Isolated footing for a column 300mm x 500 mm reinforced with 625mmdia bars with Fe 415 steel and M25 concrete subjected to a factored axial load of1000 kN and a factored uniaxial moment of 120 kNM (with respect to the major axis) at the column base. Assume that the moment is reversible. The safe bearing capacity may be taken as 200kN/mm2 at a depth of 1.25m. Assume M20 concrete and Fe 415 steel for the footing. Draw to scale (a) Plan of the footing (b) Sectional elevation showing reinforcement details. PARTB (Marks:16x3=48) 3. (a) Why water is essential for concrete making? (b) Discuss the requirements for mixing water for concrete. Why sea water is not normally recommended? 4. (a) Define the term ‘partial safety factors' as used in limit state design. Identify the various factors and state the values recommended in IS 456. (b) Compare ‘working stress method' and ‘limit state' design of R.C.C. structures. Explain the answer with suitable examples. 5. Design the reinforcement of a beam 450 mm wide 650mm deep subjected to a bending moment of 120 kNm' twisting moment of 15 kNm and a shear force of 120 kN at ultimate. Use M20 grade concrete and Fe 145 steel. 6. (a) What is the minimum percentage of steel allowed in a R C column? Explain why it is necessary to specify the minimum percentage (b) A R.C. column rectangular in section 230mm wide and 300mm deep is reinforced with 4 bars of 20mm one at each corner with an effective cover of 50mm. It is subjected to an ultimate axial load of 340 KN, ultimate bending Moment of Mux=30KNM about X axis is bisecting the depth and ultimate moment of Muy=18KNM about Y axis bisecting the width. Use M20 grade concrete and Fe 415 grade steel. Check the safety of the column. 7. Explain the I.S code provisions for limit state design for serviceability for deflection of slabs. By assuming suitable data illustrate the same with a numerical example.
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