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Theory of Structures

Theory of Structures
The point of contraflexure is the point where

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

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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

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

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Theory of Structures
A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is

M/T
2M/ T
T/M
2T/M

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Theory of Structures
A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm², the bending strain energy stored in the bar, is

711 N mm
511 N mm
611 N mm
411 N mm

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Theory of Structures
The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is

1/3
1/2
1/8
1/4

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

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

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