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Structural Design of Bridges (Elective I) (October 2009)

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Total No. of Questions : 8] P932 [Total No. of Pages : 3 [3664]-108 B.E. (Civil) STRUCTURAL DESIGN OF BRIDGES (2003 Course) (401005) (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) From Section I answer Q.1 or Q.2; Q.3 or Q.4 and from Section II answer Q.5 or Q.6; Q.7 or Q.8. 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) Explain the loads considered in the design of a highway bridge. [9] b) Classify bridges on the basis of materials of construction and forms of superstructure. [8] c) Explain with neat sketches Box Girder Bridge and Skew Bridge. [8] OR Q2) a) Classify IRC loadings. Explain IRC Class AA Tracked and Wheeled [9] loadings with neat sketches. b) Explain Pigeaud s method for the analysis of slabs. [8] c) Classify bridge bearings and explain the design of elastomeric bearing. [8] Q3) An R.C. T-Beam deck slab bridge shown in Fig. 3 has the following details. [25] a) Location of the bridge On a National Highway b) Thickness of railings 100 mm c) Size of kerbs (600X600) mm d) Thickness of wearing coat 80 mm e) Span of main girder 20.0 m f) Spacing of main girders 3.0 m c/c g) Spacing of cross-beams 4.0 m c/c P.T.O. h) Live load IRC Class AA Tracked Vehicle i) Materials M30 grade of concrete and Fe 415 grade of steel. Adopt m1 = 0.05 and m2 = 0.02 Design the deck slab. OR Q4) For the R.C. T-Beam deck slab bridge given in Q.3, design the central posttensioned prestressed girder. Use M45 grade of concrete and high tension strands of 7 ply 15.2 mm diameter having an ultimate tensile strength of 1200 N/mm . Use Fe 415 steel for supplementary reinforcement. Consider loss ratio as 0.80. [25] SECTION - II Q5) a) Explain structural arrangement for deck and through type truss girder railway steel bridges with neat sketches. [8] b) Explain the various loads and forces acting on railway steel bridges.[10] c) Classify railway steel bridges on the basis of load carrying elements. [7] OR Q6) a) Explain portal bracing and sway bracing with neat sketches. [7] b) Design a rocker bearing for a 32 m span truss girder railway bridge with the following data. The reaction due to dead load, live load and impact load is 1500 kN. The vertical reaction due to overturning effect of wind at each end of the girder is 120 kN. The lateral load due to wind effect at each bearing is 60 kN. The tractive force and braking force are 981 kN and 686 kN [18] respectively. [3664]-108 -2- Q7) The Pratt truss through type railway bridge shown in Fig. 7 has the following details. [25] a) Weight of stock rail 0.60 kN/m. b) Weight of check rail 0.40 kN/m. c) Timber sleepers of size 0.25 m X 0.25 m X 2.5 m@ 0.45 m c/c. d) Unit weight of timber 7.5 kN/m . e) Spacing of truss 6.0 m c/c. f) The bridge supports a eudl of 2950 kN. Design the members U3-U4 and U3-U4. OR Q8) For the Pratt truss through type railway bridge given Q.7, design the top and bottom lateral bracing with the given data. The rails are 800 mm above the c.g. of bottom chord. The chord members are 500 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] W [3664]-108 -3-

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