The effective span of an arch in masonry is measured as:
Choose the correct answer
Distance between outer faces of abutments
Clear span between inner faces of supports plus the depth of skewbacks (bearing on abutments), typically = clear span for semicircular arches
Height of arch only
Width of arch barrel
Correct Answer
B. Clear span between inner faces of supports plus the depth of skewbacks (bearing on abutments), typically = clear span for semicircular arches
Why is this the answer?
Arch effective span = clear span between faces of supports (for flat or segmental arches with no defined skewback). For semicircular arch: effective span = clear span. Arch masonry is measured as the volume of masonry in the arch ring (length x width x thickness of ring). Centring (temporary support during construction) is measured separately.
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