tailieunhanh - Behavior of concentrically loaded CFT braces connections

Concrete filled tubes (CFTs) composite columns have many economical and esthetic advantages, but the behavior of their connections is complicated. Through this study, it is aimed to investigate the performance and behavior of different connection configurations between concrete filled steel tube columns and bracing diagonals through an experimental program. The study included 12 connection subassemblies consisting of a fixed length steel tube and gusset plate connected to the tube end with different details tested under half cyclic loading. A notable effect was observed on the behavior of the connections due to its detailing changes with respect to capacity, failure mode, ductility, and stress distribution. | Journal of Advanced Research 2014 5 243-252 Cairo University Journal of Advanced Research ORIGINAL ARTICLE Behavior of concentrically loaded CFT braces connections CrossMark Maha M. Hassan Hazem M. Ramadan Mohammed N. Abdel-Mooty Sherif A. Mourad Department of Civil Engineering Cairo University Gamaa Street Giza Egypt ARTICLE INFO ABSTRACT Article history Received 14 November 2012 Received in revised form 17 March 2013 Accepted 18 March 2013 Available online 26 March 2013 Keywords Concrete filled tube CFT columns Connections Ductility Strength Detailing Concrete filled tubes CFTs composite columns have many economical and esthetic advantages but the behavior of their connections is complicated. Through this study it is aimed to investigate the performance and behavior of different connection configurations between concrete filled steel tube columns and bracing diagonals through an experimental program. The study included 12 connection subassemblies consisting of a fixed length steel tube and gusset plate connected to the tube end with different details tested under half cyclic loading. A notable effect was observed on the behavior of the connections due to its detailing changes with respect to capacity failure mode ductility and stress distribution. 2013 Cairo University. Production and hosting by Elsevier . All rights reserved. Introduction Concrete filled steel tube CFT columns are widely used in composite steel-concrete braced steel frames due to the gained advantages from combining concrete and steel. They increase the frames stiffness compared to open steel sections and decrease construction costs as they preclude the use of shuttering. The use of braced frames becomes indispensable especially in Corresponding author. Tel. 20 1064149907. E-mail address mahamoddather@ . Hassan . Peer review under responsibility of Cairo University. Production and hosting by Elsevier multi-story buildings to reach the drift limits recommended by the design .