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JNTU B.Tech III STEEL STRUCTURES DESIGN AND DRAWING Previous Question Paper (April - 2018 - R15)

B.Tech | III | III-II | R15 | April - 2018

Answer PaperPaper Code: 126WYMaximum Marks: 75Time: 3 hours

Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions. Use of IS: 800-2007 code, steel table and extracts from code is permitted.

Part A

125 marks
a
Enumerate the different limit states as per code.
2 marks

Answer

As per IS 800:2007, the two primary limit states are: 1) Limit state of strength, which concerns the safety of the structure against collapse, and 2) Limit state of serviceability, which concerns the functional performance of the structure under normal service conditions.

b
List the failure modes that may control the strength of a bolted joint.
3 marks

Answer

The failure modes for a bolted joint include: 1) Shear failure of the bolt, 2) Bearing failure of the bolt or the connected plate, 3) Tensile failure of the plate (tearing), 4) Splitting or block shear failure of the plate, and 5) Shear failure of the plate.

c
List the checks to be made before, during and after welding to maintain quality control.
2 marks

Answer

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d
Distinguish between lacing and battening.
3 marks

Answer

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e
List the defects in weld.
2 marks

Answer

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f
Write down the assumptions involved in the design of purlins.
3 marks

Answer

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g
Generally purlins are placed at the panel points. Why?
2 marks

Answer

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h
List the forces acting on the web splice of a plate girder.
3 marks

Answer

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i
Explain briefly about failure of bolted joints.
2 marks

Answer

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j
Explain under what circumstances intermediate vertical stiffners and end bearing stiffners need to be provided in plate girder.
3 marks

Answer

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Part B

210 marks
a
What are the various types of structural steel? Discuss their mechanical properties.
5 marks

Answer

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b
Sketch the various types of Bolted connections and Welded connections.
5 marks

Answer

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OR
3
A bridge truss diagonal carries a pull of 200 kN. The length of the diagonal is 3 m. The member is connected to a gusset plate 10 mm thick. Design a suitable section using.
10 marks
a
Single angle section.
5 marks

Answer

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b
Double angle section.
5 marks

Answer

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4
Design a column having an effective length of 6 m and subjected to a factored axial load of 2400 kN. Provide the channels back-to-back connected by welded lacing. Assume Fe410 grade steel.
10 marks

Answer

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OR
5
A column [email protected] N/m carries an axial compressive factored load of 1700 kN. Design a suitable welded gusset base. Assume M20 grade concrete.
10 marks

Answer

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6
Design a simply supported plated rolled steel beam section to carry a uniformly distributed load of 20 kN/m inclusive of self weight. Effective span of the beam is 3 m. The compression flange of the beam is laterally supported.
10 marks

Answer

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OR
7
Design a purlin of a roof truss covered by roof sheeting: Spacing b/n truss : 5m. Spacing b/n purlin : 1.2 m. Span of truss : 10m. Self Wt. of roof sheeting : 171 N/m2. Self Wt. of purlin : 125N /m2. Live Load : 0.4 kN/m2. Wind Load : -2 kN/m2.
10 marks

Answer

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8
A bridge truss diagonal carries a pull of 200 kN. The length of the diagonal is 3 m. The member is connected to a gusset plate 10 mm thick. Design a suitable section using.
10 marks
a
Single angle section.
5 marks

Answer

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b
Double angle section.
5 marks

Answer

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OR
9
Design a splice for joining tension member sections 160 × 10mm and 320 × 16mm. The member is subjected to a factored tensile load for 360 kN. Assume Fe 410 grade of steel. Provide 20mm diameter bolts of grade 4.6 for making the connections.
10 marks

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10
Design intermediate transverse stiffeners and connections without using tension field action for the welded plate girder section as follows; Web plate = 3000 mm × 8 mm; Flange plates = 500 mm × 20 mm; Factored bending moment and shear force are 4500 kN-m and 900 kN respectively.
10 marks

Answer

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OR
11
A railway steel bridge girder of span 18 m carrying a uniformly distributed load of 50 kN/m. Design a welded thin web plate girder with no intermediate transverse stiffeners. Assume depth to thickness ratio of web as 150. Take yield stress of steel as 250 N/mm2.
10 marks

Answer

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This page contains the question paper of STEEL STRUCTURES DESIGN AND DRAWING from JNTU for B.Tech CEE III III-II, April - 2018, R15.

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