An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it.In modern building construction arch is used as a Decorative structure.It may be constructed by masonry work or moulded by Concrete or plater of paris or by fabricated with framing work of metal or wood and finished by a cladding material.
In decorative sense Arches are classified according to its Design materials used and construction method.
Masonry arches
Brick , natural stone , Cement blocks etc are used for masonry arches.
Molded arches
Concrete and plaster of paris is used for molded arches.
Framed arches
Steel truss work coverd with decorative sheets.ACP sheet, Structural glass, Flux sheet are used for this.