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A ____________ is a structural element in masonry construction that provides support at openings in the masonry. Alternate names are “flat arch” and “straight arch”.

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A ____________ is a structural element in masonry construction that provides support at openings in the masonry. Alternate names are “flat arch” and “straight arch”.

(a) round arch

(b) equilateral arch

(c) flamboyant arch

(d) jack arch

I got this question in an online interview.

Asked question is from Jack Arched and Flat Terraced Roof in division Different Type Roofs, R.C.C of Civil Engineering Drawing

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The correct option is (d) jack arch

Easiest explanation: Unlike regular arches, jack arches are not semicircular in form. Instead, they are flat in profile and are used under the same circumstances as lintels. Unlike lintels, which are subject to bending stress, jack arches are composed of individual masonry elements cut or formed into a wedge shape that efficiently uses the compressive strength of the masonry in the same manner as a regular arch.

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