ABSTRACT
Abstract This paper discusses the ultimate behavior of two types of diaphragm stiffened double K-joints to be used for long-span trusses. One type of stiffened joint has three stiffening diaphragms, a central diaphragm passing through the chord and two diaphragms welded to inside surfaces of the chord. The other type has only one central diaphragm. Unstiffened double K-joints were also tested. Two cases of loading were considered, the case of gravity load acting on truss frames and that of horizontal loads perpendicular to the spanning direction of truss frames.
