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Steel Structures

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D epartment o f Civil Engineering Indian Institute o f Technology K haragpur Date: F ebruary 2011 Time: 2 h rs Full Marks: 3 0 S pring Semester 3 rd y ear B. Tech. (H) & B. Arch. (H) Sub. No.: C E30002 No. ofStudents: 79 Sub. Name: Design o f Steel Structures N ote: Use o f codes ( IS 8 00:2007 a nd SP6 (1)) is permissible. Assume steel o f grade Fe410, a nd the threads o f t he bolts fall in the shear planes i f n ot m entioned. Assume suitable d ata i f n ot given. 1. Determine the strength for each o f the following cases i f M20 grade 4.6 ordinary bolts are used to connect 16 mm thick plates. (i) Lap joint (ii) Single cover butt joint; cover plate thickness= 12 mm (iii) Double cover butt joint; cover plate thickness = 10 mm . .. 3+3+3 2. Design a welded connection for a tension member consisting o f ISMC 250 to develop its full strength. Length o f the joint is limited to 35 em. Assume the size o f weld as 5 mm and is fabricated in the field. Provide the sketch for the detailing o f the weld connection. . .. 4 3. A plate o f200 x 10 mm and Fe 410 grade is used as a tension member which is connected to a 16 mm thick gusset plate. Calculate the design tensile strength i f M20 grade 4.6 ordinary bolts are used for connection in a staggered manner as shown in the figure below. Gusset plate 0 0 0 0 0 0 I(P+P1 p = 50 mm; g =30 mm; e = 4 0 m m F ig.l . .. 5 4. A tie member o f 3.0 m long carries an axial tensile load o f 200 kN due to dead and live load. The tension member is connected to a 12 mm thick gusset plate. Design a suitable single unequal section for the following cases using: (i) M20 grade 4.6 ordinary bolt and (ii) 5 mm size fillet weld and is fabricated in the shop. . . . 6+6

 

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