Abstract: A structural beam assembly is for use in supporting a fabric covered building includes a plurality of adjacent beam sections in end-to-end alignment and a means for interconnecting the adjacent beam sections. Each beam section comprises an upper member, a lower member and a reinforcing web extending between and interconnecting the upper and lower members. According to one embodiment, the upper and lower members are tubular and the connection means comprises a connection bracket having an upper tubular member sized for insertion into the upper tubular members of a two adjacent beam sections and a lower tubular member sized for insertion into the lower members two adjacent beam sections. In another embodiment, the upper and lower members are tubular and the connection means comprises a swaged portion integrally formed on the upper tubular member of one of the two adjacent beam sections and a swaged portion integrally formed on the lower tubular member of one of the two adjacent beam sections.