Trussed girder, roof framing using the trussed girder and mehtod of constructing the roof framing of a building using the trussed girder

摘要

Trussed girder, roof framing using the trussed girder and method of constructing the roof framing of a building using the trussed girder. In the trussed girder, an upper cord and a lower cord are jointed through lattice members. The trussed girder includes: a prestressing steel member; and an attaching mechanism for attaching the prestressing steel member to at least one of both the upper and lower cords to longitudinally extend under tension for providing prestress to the trussed girder.