The deflection amplification factor of steel moment resisting frames using reduced beam section connections.

摘要

The deflection amplification factor, Cd, is a very important part of designing the story drifts of a structure. By multiplying the elastic deflection of a structure by the Cd coefficient, one will get the expected plastic deflection for the design seismic forces.; According to IBC, special steel momentframes have a Cd value of 5.5 for all frames; independent of what type of connection is being used. Therefore the Cd values will most likely not be the same for all connections. The objective of this research is to determine the deflection amplification factor for steel moment resisting frames using reduced beam section connections.; FEMA 350 shows that for a reduced beam section, the minimum span-to-depth ratio should be 5 for an ordinary, and 7 for a special moment frame. The data collected in this study will be used to compare these values to see if they agree with FEMA 350.