Experimental behaviour of end-plate beam-to-column composite joints under monotonical loading

Abstract

An experimental research program on end-plate beam-to-column composite joints under monotonical loading is presented. The major focus relates to the identification of the contribution of the concrete confinement in composite columns to the behaviour of the joint, coupled with a thorough assessment of the various loading possibilities, ranging from symmetric and anti-symmetric loading on internal nodes to external nodes under hogging and sagging moments, typical in seismic regions. Comparison with current methodologies in the analysis of composite joints is also presented.

Testing of semi-rigid steel–concrete composite frames subjected to vertical loads

“…[28] and compared with the test results in Table 4, and the test results are quite close to the predicted results. It is found that the test rotation capacity satisfies the ductility requirement of no less than 30 mrad [6] for earthquake resistance, and the rotation capacities of the internal connections were smaller than those of the external connections.…”

“…Having established the various forces (the components' resistance according to EC3), and assuming that the neutral axis lies in the web of the beam (the most common situation), the moment resistance of the connection is obtained by taking moments with respect to the midpoint of the beam's bottom flange, yielding [6],…”

“…In the past 20 years, a large number of studies have been conducted on bare steel connections and composite connections [4][5][6][7][8][9][10]. The behavior of composite connections has been extensively examined, but the majority of this work has concentrated on composite connections between steel columns and composite beams with end-plate connections or flange and web cleat connections.…”

Influence of Joint Slippage on the Cyclic Response of Steel Frames

“…The initial rotation (φ n ) and initial stiffness (R) are evaluated at point (M n , φ n ): (5) and (6). The stiffness at the start of each cycle (R) is obtained as a function of the accumulated energy of the previous cycle (Ω), according to equation (7), as shown in Fig.…”

“…To calibrate the numerical procedures and to provide data for the subsequent case study, two composite joints tested experimentally at the University of Coimbra [6] were selected and are illustrated in Figure 5a and Figure 5b. Joint E9 represents an external node connection, while joint E11 represents an internal node connection.…”