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Theory of Structures

Theory of Structures
If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:

Q = F – S
Q = S – F
Q = S + F
Q = S × F

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Theory of Structures
Stress may be defined as

Force per unit area
Force per unit volume
Force per unit length
None of these

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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 spring of mean radius 40 mm contains 8 action coils of steel (N = 80000 N/mm²), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is

30 N
35 N
25 N
40 N

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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
150 N/mm²
80 N/mm²
100 N/mm 2

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Theory of Structures
A three hinged arch is generally hinged at its supports and

At the crown
Anywhere in the rib
None of these
At one quarter span

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