Comparison between 'Common Moment Connection' and Moment Connection with Side Plates for Double-I Built-up Columns

摘要

The commonly used rigid moment connections between I-beam and double-I built-up columns cause excessive deformations in column cover plate. To modify the performance of moment connections, we have studied the application of side plate method and method proposed by Specifications. In connection with side plates there is a gap between beam end and face of column. Due to this separation the tensile force is not applied directly to the column cover plate and the moment is transferred from beam to the column through the side plates. Method proposed by the Specifications consists of using a vertical stiffener plate inside the column. In this paper we have compared the behavior of "common moment connection", with these two new systems using finite element method. Results show that "common moment connection" is partially restrained and using a vertical stiffener plate inside the column, reduces the column cover plate deformations, but connection remains partially restrained and high stress levels exist in column cover plate. Moment connection with side plates is a fully restrained connection and due to separation between beam end and face of column there is no stress concentration in column cover plate.