A strainer arch (also straining arch) is an internal structural arch built to relieve the inward pressure off the spanned vertical supports (providing a "buttress", thus also called buttressing arches), usually as an afterthought to prevent the supports from imploding due to miscalculation. In the past they were frequently adorned with decoration, with one of the best examples provided by Wells Cathedral.
A strainer arch (also straining arch) is an internal structural arch built to relieve the inward pressure off the spanned vertical supports (providing a "buttress", thus also called buttressing arches), usually as an afterthought to prevent the supports from imploding due to miscalculation. In the past they were frequently adorned with decoration, with one of the best examples provided by Wells Cathedral.
Source: Wikipedia "Strainer arch" · CC BY-SA 4.0
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