JNTU
JNTU B.Tech III DESIGN OF STEEL STRUCTURES Previous Question Paper (August/September - 2024 - R16)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
iv) Use of IS 800, IS 875 (part 3) and steel tables is allowed.
PART – A
Define the efficiency of a joint.
Answer
The efficiency of a joint is defined as the ratio of the strength of the joint to the strength of the un-jointed solid plate, expressed as a percentage.
Explain the Prying action of a bolt.
Answer
Prying action is an additional tensile force induced in bolts due to the flexibility of the connected parts (like flange plates) when subjected to an external load. As the connection deforms, the plate acts as a lever, increasing the force on the bolt beyond the applied external load.
What are the factors affecting the strength of a steel column?
Answer
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What are the functions of a Lug-angle?
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Define a Plastic hinge.
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Explain the salient features of a laterally supported beam.
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What is the necessity of a bearing stiffener?
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Explain the parameters influencing the economical depth of a plate girder.
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What is the basic wind speed?
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What are the different types of roof trusses?
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PART – B
Determine the design tensile strength of a lap joint connecting two steel, each of size 300 mm × 10 mm, using the configuration of bolts as shown in Figure. If the yield and ultimate tensile stress of the steel are 250 MPa and 410 MPa, respectively. Use M20 bolts of grade 4.6. Adopt the staggered pitch = 75 mm and gauge = 60 mm.
Answer
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A tension member of a roof truss consists of two ISA 100×75×10 mm subjected to a tensile force of 350 kN. The two angles are to be connected on the either side of a 12 mm thick gusset plate. Design the welded connection.
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Design a battened column with two channels back-to-back of length 9 m and subjected to an axial load of 1500 kN. One end of the column is restrained against translation and rotation and the other end is restrained against only translation.
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Design the slab base of a column, ISHB 400 @779 N/m, subjected to factored axial load of 1800 kN. The column is to be supported on M 25 grade concrete pedestal.
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Design a simply supported beam of span 6.5 m subjected to uniformly distributed working load of intensity 80 kN/m. Assume that the beam is laterally supported.
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A beam of section ISMB 250 @ 365 N/m is to be connected to a column ISHB 250 @ 537 N/m. The beam transfers end reaction of 200 kN to the column flange. Design a stiffened seat connection using bolts of grade 4.6.
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Design a simply supported welded unstiffened plate girder of span 18 m, subjected to two concentrated service loads of magnitude 300 kN at one-third points, in addition to a uniformly distributed service load of 25 kN/m. Assume that the compression flange is laterally restrained.
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Design a laterally restrained simply supported welded plate girder of span 24 m, with intermediate stiffeners using tension field action. The plate girder is required to support a uniformly distributed load of 120 kN/m over the entire span excluding the self weight.
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Design the tubular purlins of a roof truss of span 15 m, using the following data: Spacing of roof truss : 4 m, Slope of the roof truss : 1 Vertical: 3 Horizontal, Wind load normal to the roof : 1.5 kN/m2, Vertical load from roof sheets: 150 N/m2
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Determine the design loads on the purlins of an industrial building to be constructed in Chennai, using the following data: Life span : 50 years, Permeability : Normal, Spacing of roof truss : 3 m, Span of truss : 12 m, Central Rise : 3 m, Height of truss at eaves level : 9 m, Length of the building : 45 m, Roof : GI sheeting, Topography : θ < 30
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