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Theory of Structures

Theory of Structures
The equivalent length is of a column of length having both the ends fixed, is

L
L/2
2 L
l

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Theory of Structures
A two hinged parabolic arch of span l and rise h carries a load varying from zero at the left end to ? per unit run at the right end. The horizontal thrust is

ωl²/8h
ωl²/12h
ωl²/4h
ωl²/16h

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Theory of Structures
A simply supported rolled steel joist 8 m long carries a uniformly distributed load over it span so that the maximum bending stress is 75 N/mm². If the slope at the ends is 0.005 radian and the value of E = 0.2 × 106 N/mm², the depth of the joist, is

400 mm
300 mm
200 mm
250 mm

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Theory of Structures
The ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar, is

1/2
1/4
1
2

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Theory of Structures
A steel rod of sectional area 250 sq. mm connects two parallel walls 5 m apart. The nuts at the ends were tightened when the rod was heated to 100°C. If steel = 0.000012/C°, Esteel = 0.2 MN/mm², the tensile force developed at a temperature of 50°C, is

150 N/mm²
80 N/mm²
100 N/mm 2
120 N/mm²

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Theory of Structures
At yield point of a test piece, the material

Behaves in an elastic manner
Undergoes plastic deformation
Regains its original shape on removal of the load
Obeys Hooke’s law

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