JNTU
JNTU B.Tech III STRUCTURAL ENGINEERING - II (STEEL) Previous Question Paper (February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 15 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 12 marks and may have a, b as sub questions. iv) Use of IS 800:2007, IS 875 (part 3) and steel tables is allowed
PART - A
What is ductility?
Answer
Ductility is the mechanical property of a material that allows it to undergo significant plastic deformation under tensile stress before rupture or failure occurs. It enables a structural member to deform permanently without losing its load-carrying capacity, which is essential for redistributing stresses and providing warning before structural collapse.
What is the difference between black bolts and HSFG bolts?
Answer
Black bolts, also known as ordinary or unfinished bolts, are made from mild steel and rely on the bearing and shear strength of the bolt shank. They are typically used for light structures or temporary connections where slip is permissible, and they transfer loads through bearing against the sides of the holes.
HSFG (High Strength Friction Grip) bolts are manufactured from high-strength steel and are tightened to a specific pre-tension. They transfer loads primarily through friction generated between the connected plates due to the high clamping force, rather than through bearing, making them superior for structures subjected to dynamic or fatigue loading.
Define slenderness ratio.
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How does ductility affect the strength of a tension member?
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What is load factor usually adopted in plastic design?
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Why are the restraints required in members designed by the plastic analysis?
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Name the components of a plate girder.
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Why are intermediate stiffeners required for plate girders?
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Mention the various loads to be considered for the designing of roof trusses.
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Mention the various types of roof trusses with neat sketches.
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PART - B
Explain the criteria for Limit state of strength and Limit state of serviceability.
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Two 8 mm thick plates are connected by a single bolted lap joint with 20 mm dia. bolts. Pitch of the bolts is 60 mm. Calculate the efficiency of joint. Take fu of the plates 410 MPa and 4.6 grade bolts (fub = 400 MPa).
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Explain the design procedure of eccentric bolted connection for a case when line of action of load does not lie in the plane of group of bolts, and the line of rotation does not pass through the centre of gravity of group of bolts.
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An ISLB 300 carrying udl of 50 kN/m has effective span of 8m is to be connected to the web of girder ISMB 450. Design the framed connection using 20mm black bolts.
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Briefly explain the phenomena of web buckling and web crippling.
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Design the stiffener at 3m from the end of a plate girder of 15m span. It carries a dead load of 35 kN per meter run and a moving load of 50kN per meter run longer than the span. The web is 1600 mm × 12 mm in section. Neglect impact.
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Using a lug angle, design a suitable joint for 100 mm × 65mm × 10 mm angle, used as a tension member. Use 20 mm diameter bolts of grade 4.6 and thickness of gusset plate 8 mm.
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Design a slab base for a column ISHB 300 @ 577 N/m carrying an axial load of 1000 kN. Adopt M20 concrete and welded connection between column and base plate.
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State the theorems associated with plastic analysis of design.
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An ISMB 300 @ 442 N/m is subjected to an UDL of 20 kN/m. If the beam is laterally restrained and effective span of the beam is 5 m, check the adequacies of the beam in flexure, shear and deflection. Take fy = 250 N/mm2 and E = 210 kN/mm2.
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Determine the plastic moment capacity of a continuous beam shown in figure below.
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Design a welded plate girder 24 m in span and laterally restrained throughout. It has to support a uniform load of 100 kN/m throughout the span exclusive of self-weight.
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Design a purlin for a roof truss having the following data: Span of the truss = 6.0m, Spacing of truss = 3m c/c, Inclination of roof = 30°, Spacing of Purlin = 2m c/c, Wind pressure = 1.5 kN/m2, Roof coverage= A.C Sheeting weighing 200 N/m2. Provide a channel section Purlin.
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A flat roof building of 24 m span has 1.5 m deep trusses at 5 m centers. The total dead load is 0.7 kN/m2 and the imposed load is 0.75 kN/m2. Design the truss using angle sections with welded internal joints and bolted field splices.
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A 60KN hand operated crane is provided in a building and has the following data: C/C distance of the gantry beam = 18.0m, Longitudinal spacing of columns = 7.5m, Weight of the crane = 40KN, Wheel spacing = 3.0m, Weight of the crab = 10KN, Minimum hook approach = 1.0m, Yield stress of steel = 250MPa. Design a simply supported Gantry girder assuming lateral support to it.
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