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

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Total No. of Questions : 8] [Total No. of Pages : 3 P1023 [3864]-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 Q1 or Q2; Q3 or Q4 and from Section - II answer Q5 or Q6; Q7 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) c) Explain IRC loadings with suitable examples. Explain economic span of a bridge. What are the functions of bearings? [10] [10] [5] OR Q2) a) b) c) Explain Courbon s theory for determining the load carried by longitudinal girders. [10] Explain the different types of bearing used in R.C. bridges. [10] Explain impact load. How it is calculated for R.C. bridges. [5] 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 - 175 mm. P.T.O. c) d) e) f) g) Thickness of wearing coat - 80 mm. Span of main girder - 18.0 m. Spacing of cross-beams - 3.0 m c/c. Live load - IRC Class AA Tracked Vehicle. Materials - M30 grade of concrete and Fe 415 grade of steel Adopt m1 = 0.08 and m2 = 0.059. Design the deck slab and also sketch the details of reinforcement. 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 1200 N/mm2. Use Fe 415 steel for supplementary reinforcement. Consider loss ratio as 0.80. Sketch the cable profile for the girder. [25] SECTION - II Q5) a) b) Q6) a) Explain in brief the advantages of steel bridges. [12] Explain in brief with neat sketches the various types of railway steel bridges. [13] OR Design a rocker and roller bearing for the given data. [18] i) Reaction from the girder = 2000 kN. ii) Allowable pressure on bearings = 6 N/mm2. [3864]-108 2 b) iii) Allowable pressure on bearing plate = 2500 N/mm2. iv) Allowable pressure on concrete bed = 7 N/mm2 sketch the details. What are the factors considered during the selection of bearing for steel bridges? [7] Q7) Using channel sections, design the members U2-U3, U2L3 and U3-L3 for the railway steel truss bridge shown in Fig. 7. Also draw a neat sketch of the connection of members at U3 [25] a) Weight of stock rail - 0.68 kN/m. b) Weight of check rail - 0.48 kN/m. c) Timber sleepers of size - (0.25 0.25 2.5) m @ 0.45 m c/c. d) Unit weight of timber - 7.6 kN/m3. e) Spacing of truss - 6.0 m c/c. f) The bridge supports a eudl of 2950 kN. OR Q8) For the railway bridge shown in Fig. 7, design the top and bottom lateral bracing with the given data. The rails are 850 mm above the c.g. of bottom chord. The chord members are 400 mm deep and 500 mm wide. The end posts are 475 mm deep and 475 mm wide. The web members are 475 mm deep and 240 mm wide. [25] vvvv [3864]-108 3

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