VTU Civil Engineering (Semester 7)
Design of Steel Structures
June 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) What are the rolled structural steel sections? What are the various types of rolled steel sections manufacturing?
6 M
1 (b) Explain briefly the necessity of partial safety factors and codes in structural design.
8 M
1 (c) How plastic method of design is different from limit state method of design?
6 M

2 (a) Write a note on HSFG blot.
5 M
2 (b) Determine the safe load P that can be carried by the joint shown in figure. The thickness of the flange of I-section is 9.1 mm and that of bracket plate 10mm use M20 bolts of grade 4.6.

15 M

3 (a) Explain the common defects in the welded connections.
5 M
3 (b) A joist cutting is used as bracket to support a factored load of 200 kN. It is welded to the column flange as shown in Fig. Compute the size of the filet weld.

15 M

4 (a) Determine Zp and Mp about ZZ axis for the channel section shown in Fig. Q4 (a). Given fy=250 MPa. Also find shape factor.

10 M
4 (b) Determine the plastic moment for a continuous beam having uniform cross section as shown in Fig. Q4(b).

10 M

5 (a) Explain with the aid of sketches:
i) LUG angle
ii) Gusset plate.
5 M
5 (b) A single unequal angle 100×75×6mm is connected to a 8mm thick gusset plate at the ends by 4mm welds as shown in Fig. Q5(b). Determine the design tensile strength of the angle if the gusset is connected to the 100mm leg. The yield strength and ultimate strength of the steel used are 250 MPa and d400 MPa.

15 M

6 (a) Calculate the strength of a discontinuous street of length 3.2m. The steel consists of two unequal angles 100×75×8mm (fy = 250 k/mm2, with long legs connected on the opposite sides of a gusset plate).
5 M
6 (b) Calculate the compressive resistance of a compound column consisting of ISIIB 300 with one cover plate of 350×20mm on each flange and having a length of 5m. Assume that the bottom of the column is fixed and top is rotation fixed, translation free and fy=250 Mpa.

15 M

7 (a) Define column base. What are the types of column bases?
10 M
7 (b) Design a slab base for a column ISIIB [email protected] 710.2 N/m subjected to a factorial axial compressive load of 1500 kN. The SBC of soil is 250 kN/m2. Use M20 grade concrete for the pedestal.
10 M

8 A hall of clear dimensions 15m×6m is to be covered by RCC slab flooring 12 cm thick resting over RS joists spaced at an interval of 3m, centre to centre. Floor finishing 2 cm thick is to be provided over the RCC slab. The live load on the slab is 4kN/m2. The joists are resting over 30 cm thick walls. Design an interior beam using code specifications. The unit weight of RCC and floor finish is 24 kN/m3. Apply all the necessary chicks.
20 M



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