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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/4
L/2
L/3
L/5

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Theory of Structures
A two hinged parabolic arch of span l and rise h carries a load varying from zero at the left end to ? per unit run at the right end. The horizontal thrust is

ωl²/12h
ωl²/4h
ωl²/16h
ωl²/8h

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Theory of Structures
The stiffness of the close coil helical spring is

8D3N/d4n
4D3N/d4n
d4N/8D3n
d4N/4D3n

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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

750 N/m²
75000 N/m²
75 N/m²
7500 N/m²

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Theory of Structures
A compound truss may be formed by connecting two simple rigid frames, by

Three bars intersecting at a point
Three bars
three parallel bars
Two bars

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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
40 N
25 N

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