Experimental Studies on Monotonic Behavior of Concrete-Filled Steel Square Tubular Column-Steel Beam Connection

Abstract eng:
Based on static experimental results of four specimens of concrete-filled steel square tubular column and steel beam connections, the paper investigates the mechanism and failure mode of this kind of connection, and analyzes some factors, including installation of plates to both sides of flanges, the width-to-thickness ratio of columns and the length of the diaphragms, which have influences on the bearing capacity and load transfer ability of connections. The experimental results show that this type of connection has the feature of clear loaded and stress transfer pathway; The changes of the width-to-thickness ratio have little influence on the bearing capacity of a connection, but have a little influences to the stains of the gusset plant. The stress distributions can be ameliorated and plastic hinges are located outside of the brittle weld zones and appear on the beam through welding additional plates to both sides of flanges, so that the ductility of the connection can be enhanced.

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