VTU Civil Engineering (Semester 8)
Design & Drawing of Steel Structures
June 2015
Total marks: --
Total time: --
(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) A secondary beam ISLB 450 @640 N/m is connected to main beam ISLB 600 @975 N/m with top flanges of the beams at the same level. Two angles ISA 100×100×8 mm are used for connection 5 bolts of diameter 20 mm are used to connect each to the web of the main beam, 5 bolts of diameter 20 mm are used to connect angles with web of secondary beams:
Draw to a suitable scale:
i) Sectional elevation
ii) Side view with details.
15 M
1 (b) An super storey column ISHB300 @577 N/m is to be spliced with a lower storey column ISHB400 @ 758.5 N/m. The two column are coaxial. Provide 50mm thick bearing plate and 6mm thick flange splice plate. Use 10 bolts of 20 mm diameter on each side of the joint in two lines of 5 bolts each for connecting flanges of the columns to flange splice plate.
Draw to a suitable scale:
i) Sectional elevation:
ii) Side view with details.
15 M

2 (a) A beam ISMB400 @ 604 N/m is to be connected to the flange of the column ISHB450 @ 907 N/m by means of stiffened connection. Provide top cleat angle ISA 75×75×6mm and use 4mm fillet weld for connection. Provide 120×140×16mm bearing plate and stiffening plate 220×120×12mm. Reduce the width of the stiffening plate to 50mm at the bottom. Use 5mm fillet weld all around for connection.
Draw to a suitable scale:
i) Elevation
ii) Side view.
12 M
2 (b) A gusseted base is to be detailed for a column ISHB 450 @ 855.4 N/m built up with one cover plate of section 250 × 12 mm on each flange size of the base plate is 800× 800× 20mm. The gusset angles are ISA 150×150×12mm. The gusset plates are 12mm thick with one plate at each face of the column. Provide 4 bolts of 30mm diameter in 2 rows along one face of column to connect the flange of column, gusset plate and gusset angle. 6 bolts of 20mm diameter, in 2 rows are used to connect gusset plate with each flange of the column. Nominal bolts of 20mm diameter shall be provided for connecting gusset plate and gusset angle on the sides.
Draw to a suitable scale:
i) Plan
ii) Sectional elevation
iii) Side view.
18 M

3 The centre line of a roof truss is as shown in the Fig. Q3. The magnitude and nature of forces under service conditions are
Top chord members - 120 kN compression
Bottom tie members - 100 kN tension
Interior member - 60 kN tension and 50 kN compression.
For all the interior members use similar single angle section. Design all the members and use black bolt of grade 4.6 for end connections. Also design a bearing plate and anchor bolts. 4 in numbers for a pull of 60 kN to connect the truss to an RCC column 300× 300mm of M20 grade concrete.
Draw to a suitable scale.
i) Elevation to truss greater than half space
ii) Elevation of joint C to a larger scale
iii) Elevation of support A.

70 M

4 Design a simply supported Gantry girder for an industrial shed to support an electric overhead crane using the following data:
Span Gantry girder = 4 m
Crane capacity = 160 kN
Weight of the crane excluding the crab = 250 kN
Weight of the crab = 60 kN
Minimum hook approach = 0.8m
Wheel base = 5.3 m
Span crane girder = 20 m
Height of the rail = 105 mm

Draw to a suitable scale
i) Cross section of gantry girder
ii) Plan details
iii) Elevation.
70 M

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