Memoirs of the Graduate Schools of Engineering and System Informatics Kobe University, No. 6, pp. 1-6, 2014

Effects of Width-to-Thickness Ratio of RHS Column on the Elasto-Plastic Behavior of Composite Beam

Mohammadreza ESLAMI1, Hisashi NAMBA1

1Graduate School of Engineering, Department of Architecture

(Received February 5, 2014; Accepted April 17, 2014; Online published May 13, 2014)

Keywords: Composite Beam, Rectangular Hollow Section Column, Cyclic loading test, Rotation Capacity

The results of study on the elasto-plastic behavior of composite beam connected to Rectangular Hollow Section (RHS) column in the steel moment resisting frame buildings are presented in this paper. In order to investigate the effects of width-to-thickness (B/t) ratio of RHS column on the rotation capacity of composite beam, cyclic loading test were conducted on three full scale beam-to-column subassemblies. Detail study on the different steel beam damages and concrete slab damages are presented. It is found that occurrence of sever concrete bearing crush at the face of RHS column of specimen with smaller width-to-thickness ratio resulted to considerable reduction on the rate of strain increase in the lower flange. This behavior resulted to considerable improvement of rotation capacity in this specimen comparing with composite and even bare steel beam connected to the RHS column with larger width-to-thickness ratio.

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