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Theory of Structures

Theory of Structures
The maximum magnitude of shear stress due to shear force F on a rectangular section of area A at the neutral axis, is

2F/3A
3F/2A
F/A
F/2A

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Theory of Structures
A simply supported uniform rectangular bar breadth b, depth d and length L carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is

(L/2d)²
(L/3d)²
L/2d
L/d

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Theory of Structures
Maximum principal stress theory for the failure of a material at elastic point, is known

Guest's or Trecas' theory
Von Mises' theory
Rankine's theory
St. Venant's theory

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Theory of Structures
A square column carries a load P at the centroid of one of the quarters of the square. If a is the side of the main square, the combined bending stress will be

4p/a²
2p/a²
3p/a²
p/a²

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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
200 mm
250 mm
300 mm

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Theory of Structures
Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as

Compound beams
Indeterminate beams
Determinate beams
Composite beams

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