Reg. No.: Question Paper Code : 4 21 66145 B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011. Sixth Semester Civil Engineering CE 2352 — DESIGN OF STEEL STRUCTURES (Regulation 2008) Time : Three hours Maximum : 100 marks 21 Use of IS 800 – 2007 is permitted Assume data, if required. Answer ALL questions. 4 PART A — (10 × 2 = 20 marks) Distinguish between gauge distance and pitch of the bolt. 2. What are the merits and demerits of welded connection? 3. Draw any two typical cross sections of tension member using angle sections. 4. What is block shear? 5. Define effective length of a column. 6. Draw a neat sketch of column with double lacing and mention the specifications for lacing. 7. What is laterally unsupported beam? Give an example. 4 21 1. 8. What is a plate girder? Where is it used? 9. What are the loads to be considered for the design of gantry girder? 10. Give general guidelines for fixing spacing of roof trusses. PART B — (5 × 16 = 80 marks) (a) Design a single bolted double cover butt joint to connect plates of Fy 410 grade having thickness 16 mm. Use M16 bolts of grade 4.6. Find the efficiency of the joint. (16) Or 12. 4 21 11. (b) A tie member of a roof truss consists of 2 ISA 90mm × 60mm × 10mm. The angles are connected on either side of 12 mm gusset plate and the member is subjected to the pull of 400 kN. Design the welded connection. (16) (a) Design a tension member to carry factored axial tension of 450 kN. Use 10 mm thick gusset plate and 20 mm diameter black bolts. (16) Or (a) What is a lug angle? Where is it used? (5) (ii) Design a splice to connect a 300mm × 20mm plate with 300mm × 10 mm plate to carry design load of 500 kN. Use 20 mm black bolts. (11) Design a column with double lacing system to carry a factored axial load of 1800 kN. The effective height of column is 4.5 m. Use two channels placed back to back. 4 13. (i) 21 (b) (16) Or (16) (a) Design a simply supported beam of effective span 10m to carry factored load of 60kN/m, the depth of the beam is restricted to 500mm. Assume the beam is laterally unsupported. (16) 4 14. Design a gusseted base to carry a factored axial load of 2800kN. The column consists of ISHB 450 @0.855 kN/m with two cover plates 250 mm × 20mm on either side. Take the effective height of column as 4m. 21 (b) (b) Or Design a welded plate girder using Fe415 steel for a span of 25 m to carry a load of 30 kN/m. (16) 2 66145 15. (a) Design a channel section purlin for the following data. (16) Spacing of trusses = 4 m Spacing of purlins = 2 m Live load on galvanized iron roofing sheets = 0.6 kN/m2 Slope of Main Rafter = 30 degrees Or (b) 4 21 Wind load = 1.5 kN/m2 Determine the basic wind intensity for an industrial building situated in Chennai using the following data : Life of the structure = 50 years Terrain category = 2 Size of building = 20m × 40m Height of eye board = 10 m Topography: slope <3 degrees 21 Slope: 1 in 4. 4 21 4 ————––––—— 3 66145 (16)