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Theory of Structures

Theory of Structures
In case of a simply supported rectangular beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is

L/5
L/4
L/2
L/3

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Theory of Structures
Maximum strain theory for the failure of a material at the elastic limit, is known as

Haig's theory
Rankine's theory
Guest's or Trecas' theory
St. Venant's theory

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Theory of Structures
A body is said to be in equilibrium if

It moves vertically
It moves horizontally
It rotates about its C.G.
None of these

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Theory of Structures
The locus of the end point of the resultant of the normal and tangential components of the stress on an inclined plane, is

Ellipse
Straight line
Parabola
Circle

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Theory of Structures
A steel bar 5 m × 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm² and Poisson’s ratio is 0.25, the change in the volume of the bar is:

1.125 cm³
4.125 cm²
2.125 cm³
3.125 cm³

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Theory of Structures
A steel plate d × b is sandwiched rigidly between two timber joists each D × B/2 in section. The steel will be (where Young’s modulus of steel is m times that of the timber).

BD² + mbd²)/6D]
BD² + mbd³)/4D]
BD² + mbd²)/4D]
BD³ + mbd³)/6D]

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