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Structural Design of Bridges (Elective I) (April 2010)

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Total No. of Questions : 8] P1301 [Total No. of Pages : 4 [3764] - 108 B.E. (Civil) STRUCTURAL DESIGN OF BRIDGES (2003 Course) (Elective - I)(401005) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) From Section - I answer Q.1 or Q2, Q.3 or Q4 and from Section - II answer Q.5 or Q6, Q.7 or Q8. 2) Answers to the two sections should be written in separate answer books. 3) Figures in bold to the right, indicate full marks. 4) IS 456, IS 800, IS 1343 and steel table are allowed in the examination. 5) Neat diagrams should be drawn wherever necessary. 6) If necessary, assume suitable data and indicate clearly. 7) Use of electronic pocket calculator is allowed. SECTION - I Q1) a) b) Explain the various loads specified by IRC. [9] Classify bridges on the basis of materials of construction and forms of superstructure. c) [8] Explain with neat sketch T beam deck slab bridge. [8] OR Q2) a) Explain IRC Class AA Tracked and Wheeled loadings with neat sketches. [9] b) Explain how the deck slab of a T beam deck slab bridge analyzed.[8] c) What are bridge bearings? Explain with neat sketches. [8] P.T.O. Q3) An R.C. T-Beam deck slab bridge shown in Fig. 3 has the following details : [25] a) Thickness of railings - 100 mm. b) Thickness of footpath - 200 mm. c) Thickness of wearing coat - 80 mm. d) Span of main girder - 23.0 m. e) Spacing of cross-beams - 3.0 m c/c. f) Live load - IRC Class AA Tracked Vehicle. g) Materials - M30 grade of concrete and Fe 415 grade of steel Adopt m1 = 0.055 and m2 = 0.021. Design the interior panel and the cantilever slab. OR Q4) For the R.C. T-Beam deck slab bridge given in Q.3, design the intermediate post-tensioned prestressed girder. Use M45 grade of concrete and high tension strands of 7 ply 15.2 mm diameter having an ultimate tensile strength of 1600 N/mm2. Use Fe 415 steel for supplementary reinforcement. Consider loss ratio as 0.85. [3764]-108 [25] 2 SECTION - II Q5) a) b) Explain with neat sketches deck and through type truss girder steel bridges. [13] Explain the various loads acting on railway steel bridges. [12] OR Q6) Design a rocker bearing for a 28 m span truss girder railway bridge with the following data. The reaction due to dead load, live load and impact load is 1250 kN. The vertical reaction due to overturning effect of wind at each end of the girder is 130 kN. The lateral load due to wind effect at each bearing is 75 kN. The tractive force and braking force are 981 kN and 686 kN respectively. Draw a neat sketch of detailing. [25] Q7) The Pratt truss through type railway bridge shown in Fig. 7 has the following details : a) b) c) d) e) f) [25] Weight of stock rail - 0.65 kN/m. Weight of check rail - 0.45 kN/m. Timber sleepers of size - (0.25 0.25 2.5) m @ 0.40 m c/c. Unit weight of timber - 7.5 kN/m3. Spacing of truss - 6.5 m c/c. The bridge supports a udl of 2950 kN. Design the members U3-U4, U3-L4 and U3-L3. Draw a neat sketch of the connection of members at U3. OR [3764]-108 3 Q8) For the Pratt truss through type railway bridge shown in Fig. 7, design the top and bottom lateral bracing with the given data. The rails are 900 mm above the cg of bottom chord. The chord members are 450 mm deep and 500 mm wide. The end posts are 500 mm deep and 500 mm wide. The web members are 500 mm deep and 240 mm wide. [25] vvvv [3764]-108 4

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Additional Info : April 2010 Examination - Structural Design & Bridges (Elective I) (2003 Course)
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