Abstract
Abstract This paper presents experimental and theoretical analysis of bolts employed as shear connectors in circular concrete-filled steel tube columns (CFTs). The theoretical results, obtained from ABNT NBR 16239:2013 formulations, were compared with the experimental results. A series of push-out tests were carried out, where the diameter and length of the bolts, the number of connectors and the concrete strength were varied. From the experimental results, it was observed that the equations from ABNT NBR 16239:2013 are conservative. Therefore, it is proposed an adjustment to the formulations in order to consider the concrete confinement. It was also verified that increments in the diameter and the length of the bolt increase the load capacity of the connector. However, the variation of the quantity of bolts and the concrete strength did not interfere in the load capacity.
Highlights
Concrete-filled steel tube columns (CFSTs) that are formed by a circular, square or rectangular tubular profile filled with concrete, are structural elements subjected to compression or combined compression and bending (Figure 1)
This paper presents experimental and theoretical analysis of bolts employed as shear connectors in circular concrete-filled steel tube columns (CFTs)
Regarding the parametric analysis of CFST prototypes with bolt type connectors, it is concluded that: n The load capacity of the bolt is increased when the connector (a) diameter is increased from 1/2” to 5/8”, but when increasing the diameter from 5/8” to 3/4”, the final load capacity of the connector does not change significantly; n There is an increase in the load capacity of the bolt for the longer connector length
Summary
Concrete-filled steel tube columns (CFSTs) that are formed by a circular, square or rectangular tubular profile filled with concrete, are structural elements subjected to compression or combined compression and bending (Figure 1). The EN 1994-1-1:2004 standardizes the performance of the push-out test, verifying the load and fatigue strength of the shear connectors used in composite steel and concrete structures. The developed experimental program uses an experimental technique based on previous research by the authors and in push-out tests This allowed the verification of the influence of the physical and geometric parameters of the bolt and the composite column on the behavior of the connection. With the experimental technique developed and the prototypes tested, it is possible to analyze the behavior of the bolt when used as a shear connector in a concrete-filled circular tube section column, and to evaluate the applicability of the analytical expressions of ABNT NBR 16239:2013. Some parameters like: the amount of bolts; the bolt diameter; the length of the connectors; and the fck value of the concrete were varied in order to analyze their interference in the ability of the bolt to transmit shear forces at the concrete steel interface
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