A compound arch is an arch built using multiple independent sub-arches stacked vertically, with their arcs of voussoirs placed one on the top of the other. The goal of using a compound arch is usually to increase the overall strength and reliability (if only one sub-arch is fractured, the structure still stands).
A compound arch is an arch built using multiple independent sub-arches stacked vertically, with their arcs of voussoirs placed one on the top of the other. The goal of using a compound arch is usually to increase the overall strength and reliability (if only one sub-arch is fractured, the structure still stands).
Source: Wikipedia "Compound arch" · CC BY-SA 4.0
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