Structural Analysis Ing St Analysis PDF

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POKHARAUNI VERSI TY Level: Bachelor Semester: Fall Programme: BE Course: Structural Analysis I

Year : 2015 Full Marks: 100 Pass Marks: 45 Time : 3hrs.

Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks. Attempt all the questions. 1.

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a) b)

State and prove the Maxwell’s Law of Reciprocal. Find the instantaneous maximum deflection and bending stress for a 250 mm x 400 mm beam of 3 m span and cantilever beam when struck at free end by 2000 N weighing which is falling from a height of 100 mm above the top edge of the beam. Take E = 200 GPa. Determine the deflection at centre point C and slopes at ends A and B of the beam shown in figure by the conjugate beam method. E = 205,000 MPa and I = 80 x 106 mm4.

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In the truss shown in figure, determine the vertical deflection at joint J. The rise in temperature in bottom members is 20 0C and diagonal members are 10mm too long. The cross section area of all members is equal to 100 mm2. Take E = 2x105 KN/mm2 & α=12x10-6/0C.

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a)

A three-hinged parabolic arch at span ACB of span 50 m and rise 20 m carries a uniformly distributed load of 50 kN/m on AC and two concentrated loads of 100 kN each at distance 5 m and 10 m from B. Find the horizontal thrust, bending moment, normal thrust and radial shear at a section D, 15 m from A. Construct influence lines for the girder for the moment force in panel between 2-3.

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Determine the maximum forces in the members 1, 2, 3 and 4 of the truss shown in figure when uniformly distributed load of 30 kN/m longer than the span traverses along the lower girder.

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b)

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a) A suspension cable bridge having 300m span has two three hinged stiffening girders supported by two cables with a central dip of 14m. The dead load of bridge is 1.5 KN/m run and in addition it supports three point loads of 30KN each placed at the edge of the road way and dividing the span. Find the shear and moment at 200m span from left. Also find the max. Tension in cable. b) Analyze the member forces in the given space truss shown in figure below by using tension coefficient method

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7.

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Write short notes on: (Any two) a) Strain Energy due to moment. b) Different forms of structure. c) Moment area method.

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