Inelastic cyclic testing of the kaiser bolted bracket moment connection

April 29, 2008
Publication: Crossing Borders: Proceedings of the 2008 Structures Congress. April 24-26, 2008, Vancouver, BC, Canada, ASCE
Author(s): Adan, Scott M. Gibb, William

Abstract: Developed by Steel Cast Connections, Lehigh University, and IFC Kaiser Engineers, the Kaiser bolted bracket (KBB) is a proprietary steel beam-to-column moment-resisting connection. The connection consists of cast high-strength steel haunch brackets that are fastened to the flanges of a beam and then bolted to a column. The brackets can be either fillet welded or bolted to a beam. At high levels of inelastic drift, connection yielding and plastic hinge formation occur primarily in the beam near the tip of the bracket, thereby directing deformation away from the column face and outside the connected region. The connection is designed to eliminate field welding, facilitate erection, and reduce installation costs. The brackets are manufactured in a variety of sizes and are proportioned to develop the probable maximum moment capacity of the connecting beam. The connection has been tested for a number of beam and column sizes with specimens exceeding the interstory drift angle requirements without significant strength degradation. This paper summarizes the results of the inelastic cyclic tests and their relation with the requirements of AISC 341, Seismic Provisions for Structural Steel Buildings [AISC, 2005] hereafter referred to as the AISC Seismic Provisions. The paper also includes historical background on the development of the connection.