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Theory of Structures

Theory of Structures
The point of contraflexure is the point where

M. changes sign
S.F. is zero
M. is maximum
M. is minimum

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Theory of Structures
A load of 1960 N is raised at the end of a steel wire. The minimum diameter of the wire so that stress in the wire does not exceed 100 N/mm² is:

5.0 mm
4.0 mm
4.5 mm
5.5 mm

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Theory of Structures
A bar L metre long and having its area of cross-section A, is subjected to a gradually applied tensile load W. The strain energy stored in the bar is

W²L/AE
WL/2AE
W²L/2AE
WL/AE

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Theory of Structures
The maximum deflection due to a load W at the free end of a cantilever of length L and having flexural rigidity EI, is

WL²/3EI
WL²/2EI
WL3/2EI
WL3/3EI

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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

ωl²/16h
ωl²/8h
ωl²/12h
ωl²/4h

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Theory of Structures
If a concrete column 200 × 200 mm in cross-section is reinforced with four steel bars of 1200 mm² total cross-sectional area. Calculate the safe load for the column if permissible stress in concrete is 5 N/mm² and Es is 15 Ec

284 MN
264 MN
274 MN
294 MN

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