JNTU
JNTU B.Tech III DESIGN OF STEEL STRUCTURES Previous Question Paper (February - 2023 - 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 only IS 800 and steel tables is allowed.
Part A
Define serviceability limit state.
Answer
The serviceability limit state refers to the condition under which a structure remains fit for its intended use and occupancy during its design life. It ensures that the structure does not experience excessive deflections, vibrations, or local damage that could impair its appearance, durability, or the comfort of its users, even if the structure remains structurally sound and safe against collapse.
Mention any types of serviceability limit states applicable to steel structures.
Answer
Serviceability limit states for steel structures ensure the functional performance and comfort of users under normal service conditions. The primary types include:
- Deflection: Limiting the vertical or horizontal displacement of structural members (such as beams or trusses) to prevent damage to non-structural elements like partitions or glazing and to maintain aesthetic appearance.
- Vibration: Controlling the dynamic response of floors or bridges to ensure human comfort and prevent structural fatigue caused by rhythmic or impact loading.
- Durability: Ensuring the structure maintains its integrity against environmental factors such as corrosion or chemical attack over its intended design life.
What is block shear failure?
Answer
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Discuss the purpose of providing battens in compound steel columns.
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What is laterally supported beam?
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Sketch the failure mode of laterally unsupported beams.
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Where are plate girders used?
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What are the longitudinal web stiffeners?
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Define pitch and eaves of roof truss.
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List the different types of roof trusses.
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Part B
Discuss about different types of loads and combinations of loads and also discuss about different types of stresses considered in the design.
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Two plates 300 × 12 mm of grade 410 are connected by bolts of diameter 20 mm of grade 4.6 using butt joint. Design the bolted connection to transmit a pull equal to the strength of the plate. Also sketch the arrangement of bolts in the joint.
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Explain different modes of failure of tension members.
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Design a built up column with four angles laced together having an effective length of 6 m and supporting a factored load of 1200 kN.
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What are the classification of built-up compression members.
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Design a tension member to carry a factored load of 370 kN. Use 20 mm diameter bolts and a gusset plate of 8 mm.
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A two span continuous beam of uniform section loaded with ultimate loads as shown in figure. Determine the required plastic moment of resistance.
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Design a stiffened seat connection for an ISMB 350@ 514 N/m transmitting an end reaction of 500 kN (due to factored loads) to a column section ISHB 300 @ 576.8 N/m. The steel is of grade Fe 410 and bolts of grade 4.6.
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Design a welded plate girder for an effective span of 20m carrying a UDL 25kN/m and two concentrated loads of 50kN each, acting at 6m from each end. The girder is simply supported and fully restrained against lateral buckling throughout the span.
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Design a bearing stiffener for a welded plate girder with the following specifications. Web = 1200 mm × 8 mm thick. Flanges = 2 Nos. of 400×20 mm plate on each side. Support reaction = 600 kN. Width of the support = 250 mm.
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Design a roof truss for an industrial building located in Delhi with a span of 20 m and a length of 40 m. The roofing is galvanized iron sheeting. Basic wind speed is 60 m/s and the terrain is an open industrial area. Building is class ‘B’ building with a clear height of 12 m at the eves.
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Design a purlin for a roof truss having the following data: Span of the truss = 10m, Spacing of truss = 5m c/c, Inclination of roof = 35°, Spacing of Purlin = 3m c/c Wind pressure = 2.0 kN/m2, Roof coverage = A.C Sheeting weighing 200 N/m2, Provide a channel section for Purlin.
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