## Theory of Voussoir Arches |

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abutments angle of friction arch and load arch ring arch stones centre line centre of gravity centre of pressure column considered construction corresponding crown joint cubic foot curve of pressures curve of resistance depth of arch depth of key depth of keystone divisions draw a line drawn edge equal equilibrium polygon find the resultant force diagram formulas given gives half arch haunches hence hori horizontal distance horizontal resistances horizontal thrust intrados joints of rupture left half length limit at joint line of resistance line parallel live load lower middle third masonry maximum method middle third limit multiplying ordinates parallel to ray pass a curve piers points of intersection position Q acting resistance passes rise side solid arch span spandrel specific gravity straight line stress symmetrical tender load theory thick tion tons trapezoid true line upper middle third vertical component weight of arch zoid