Tests of bolted beam-t0.-column moment connections, May 1975.

A test program was recently completed which had as its objective the investigation of various symmetrically-loaded momentresisting beam-to-column connections which are of extreme importance in the design and construction of steel multi-story frames. All specimens were fabricated of A572, Grade 55 steel. This report discusses the results of those specimens which were designed with highstrength bolts for resisting moment. There were three specimens designed and tested with bolts in bearing and one specimen with bolts in a friction (slip resistant) connection. Test results show that the bearing bolted connections initially behave in a similar manner to previous tests. However, at a certain load, these connections exhibit a distinct difference in overall behavior. The load at which this occurs can be predicted. v