Pre-qualified Seismic Moment Connections
Though the recent version of the code, IS 800:2007, contains provisions for design and detailing for seismic loads, it does not suggest the type of connections which are suitable for high or intermediate seismic zones. Connections play an important role in seismic resistance. The Northridge earthquake in California during January 1994 and the Kobe earthquake in Japan during 1995 have shown that even well designed connections are susceptible to severe damages. After an extensive testing initiated by the Federal Emergency Management Agency, USA, the AISC has suggested a few pre-qualified moment connections to be used in high or intermediate seismic zones. A brief description of these connections is provided for the benefit of designers.
Dr. N. Subramanian, Consulting Engineer, Gaithersburg, USA
