Which type of support allows only rotational movement but resists both horizontal and vertical forces?
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A.
Roller support
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B.
Fixed support
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C.
Free support
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D.
Pinned support
Correct Answer:
D. Pinned support
Explanation:
The correct answer is Pinned support.
A pinned or hinged support is designed to restrain a structure against both horizontal and vertical displacement while permitting free rotation at the joint. Unlike fixed supports, which resist all movement including rotation, or roller supports, which only resist vertical forces, a pinned support provides stability in two dimensions but does not resist bending moments. This type of connection is commonly utilized in trusses and bridge designs to ensure structural stability while allowing for necessary angular movement.
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