Arch

= Curved structure located between two intermediate supports; it can resist more compression force than the lintel and allows the use of bigger spans. =



Shapes = semicircular (Roman), segmental (less than half a circle), or pointed (Gothic). =

= Parts =
 * 1) = Keystone =
 * 2) = Voussoir =
 * 3) = Back =
 * 4) = Impost =
 * 5) = Intrados =
 * 6) = Rise =
 * 7) = Clear span, "Bay" =
 * 8) = Abutment =

= =

Types of Archs
 * = Circular arches from a single center. =
 * = Circular arches of more than one center. =
 * = Non-circular arches of two centers. =