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The Scientific World Journal
Volume 2013 (2013), Article ID 515936, 14 pages
http://dx.doi.org/10.1155/2013/515936
Research Article

Ductility Enhancement of Post-Northridge Connections by Multilongitudinal Voids in the Beam Web

1Department of Civil Engineering, Istanbul Aydin University, Florya Main Campus, İnönü Street, Sefaköy-Küçükçekmece, 34295 Istanbul, Turkey
2Department of Civil Engineering, Eastern Mediterranean University, P.O. Box 95, Gazimagusa, North Cyprus, via Mersin 10, Turkey
3Department of Civil Engineering, Islamic Azad University, Kerman Branch, Joopar Road, Kerman 7635131167, Iran

Received 6 August 2013; Accepted 10 September 2013

Academic Editors: E. Choi and H.-T. Hu

Copyright © 2013 Sepanta Naimi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Since the earthquakes in Northridge and Kobe in 1994 and 1995, respectively, many investigations have been carried out towards improving the strength and ductility of steel beam to column pre- and post-Northridge connections. In order to achieve these objectives, recent researches are mainly focused on three principles: reducing the beam section to improve the beam ductility, adding different kinds of slit damper to beam and column flanges to absorb and dissipate the input earthquake energy in the connection and strengthening the connection area using additional elements such as rib plates, cover plates, and flange plates to keep the plastic hinges away from the column face. This paper presents a reduced beam section approach via the introduction of multilongitudinal voids (MLV) in the beam web for various beam depths varying from 450 mm to 912 mm. ANSYS finite element program was used to simulate the three different sizes of SAC sections: SAC3, SAC5, and SAC7. Results showed an improvement in the connection ductility since the input energy was dissipated uniformly along the beam length and the total rotation of the connection was over four percent radian.