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Theory of Structures

Theory of Structures
In case of a simply supported I-section 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/3
L/2
L/5

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

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

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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

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

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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

75000 N/m²
750 N/m²
7500 N/m²
75 N/m²

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Theory of Structures
A material is said to be perfectly elastic if

It does not regain its original shape at all
It regains its original shape on removal of the load
None of these
It regains its original shape partially on removal of the load

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Theory of Structures
If a concrete column 200 × 200 mm in cross-section is reinforced with four steel bars of 1200 mm² total cross-sectional area. Calculate the safe load for the column if permissible stress in concrete is 5 N/mm² and Es is 15 Ec

274 MN
284 MN
294 MN
264 MN

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