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Theory of Structures

Theory of Structures
The greatest load which a spring can carry without getting permanently distorted, is called

Proof stress
Proof resilience
Proof load
Stiffness

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Theory of Structures
At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by

Depth of the neutral axis
Depth of the section
Maximum tensile stress at the section
Maximum compressive stress at the section

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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:

4.125 cm²
3.125 cm³
1.125 cm³
2.125 cm³

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Theory of Structures
A masonry dam (density = 20,000 N/m³) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be

7500 N/m²
750 N/m²
75000 N/m²
75 N/m²

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Theory of Structures
In a shaft, the shear stress is not directly proportional to

Length of the shaft
Modulus of rigidity
Radius of the shaft
Angle of twist

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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

300 mm
400 mm
200 mm
250 mm

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