Tubular Web RBS Connection to Improve Seismic Behavior of Moment Resisting Steel Frames

Seyed Mehdi Zahrai, Seyed Rasoul Mirghader, Aboozar Saleh
2017 Scientia Iranica. International Journal of Science and Technology  
A new type of Reduced Beam Section (RBS) connection, called \Tubular Web RBS (TW-RBS)", is proposed in this research. TW-RBS is made by replacing a part of web with a tube at the expected location of the beam plastic hinge. In addition to an analytical study, the proposed section is numerically studied under cyclic load using ABAQUS niteelement software, and a test specimen is used for the calibration of numerical results. The results show that using TW-RBS not only creates a ductile fuse far
more » ... om the beamto-column connection components, but it also increases story drift capacity up to 9%. Furthermore, the tubular web, like corrugated sheet, can improve both the out-of-plane sti ness of the beam longitudinal axis and the ange stability condition due to the smaller width-to-thickness ratio of the beam ange in the plastic hinge region. Thus, the tubular web improves lateral-torsional buckling stability of beam. On the other hand, the tubular web provides a better condition than other accordion web with sharp corners in terms of low-cycle fatigue, because change of direction of strain in arc shape of the tubular web section is smaller than the accordion web with sharp corners.
doi:10.24200/sci.2017.4168 fatcat:xwogg2u3lncr5ikozfgd5ih2ci