Abstract:
The Asymmetric Friction Connection (AFC) is an energy dissipating component consisting of five steel plies all clamped by the High Strength Friction Grip (HSFG) bolts. The AFC is the integral component of the Sliding Hinge Joint (SHJ) connection, a low damage solution for the seismic Moment Resisting Steel Frames (MRSFs). The AFC can provide a unique pinched form hysteresis loop and is cost effective and simple to build. It is now being used in practice as well as being improved through ongoing research. In current practice, the AFC uses two abrasion resistant shims at both sides of the cleat (the only AFC plate with slotted holes), all sandwiched between the cap and beam flange plates. Except for the shims, the AFC plates are made of mild steel. However, a concern with the AFC is its post sliding elastic strength reduction. A significant reason for this is the post sliding degradation of the AFC sliding surfaces. This paper presents the results of the following experimental studies on AFC performance: • AFCs with abrasion resistant cleat and no shims • AFCs with Titanium Nitride (TiN) coated shims
