Abstract
ABSTRACT: This paper presents a numerical study of the Crestbond shear connector, characterized by a steel plate with regular cuttings, when used as a load transfer element in concrete filled composite columns in fire. The developed numerical model was calibrated with experimental results of composite columns in fire and later the load transfer devices were inserted. Numerical analyzes were performed with the software Abaqus and comprised the variation of the composite column diameter and of the loading levels, as well as the comparison with the results obtained when is used a through steel plate without cuttings (Shear Flat) as a load transfer device. With the analyzes performed, it was observed that the Crestbond shear connector and the Shear Flat present very similar thermomechanical performance in relation to the load transfer capacity. Thus, the Crestbond shear connector has the potential to be applied alternatively to the Shear Flat as a load transfer device in concrete filled composite columns, with the advantage of the possibility of associate use of longitudinal and manly transverse reinforcement.
Highlights
The concrete filled composite column (CFCC) are basically composed of an external steel tube and a concrete core, the interaction of which provides greater resistance and ductility when compared to the individual application of each of these components [1]
To ensure the interaction between the components of the composite columns and an adequate load transfer, shear connectors can be used, especially in the region where loads are introduced [1], [2]. In view of this premise and the need for the load transfer devices used to be compatible with the use of reinforcement and easy to install, a constructive solution was developed at the Federal University of Minas Gerais, which consists of using Crestbond shear connectors as load transfer device at the steel-concrete interface, while integrating the beam-column connection [3]–[8] (Figure 1)
Given the absence of experimental CFCC models with Crestbond shear connectors as a load transfer device in fire, a numerical CFCC model was initially developed, which was validated with experimental results and, subsequently, the shear connectors were added to the validated model
Summary
The concrete filled composite column (CFCC) are basically composed of an external steel tube and a concrete core, the interaction of which provides greater resistance and ductility when compared to the individual application of each of these components [1]. To ensure the interaction between the components of the composite columns and an adequate load transfer, shear connectors can be used, especially in the region where loads are introduced [1], [2] In view of this premise and the need for the load transfer devices used to be compatible with the use of reinforcement and easy to install, a constructive solution was developed at the Federal University of Minas Gerais, which consists of using Crestbond shear connectors as load transfer device at the steel-concrete interface, while integrating the beam-column connection [3]–[8] (Figure 1). In this work, a numerical study was carried out, using Abaqus software, on the thermomechanical behavior of the Crestbond shear connector used as a load transfer device in CFCC of circular cross section, considering the dimensional variation of the steel tube, different load levels, the effect of thermal expansion and the comparison with the use of plates without cuttings (Shear Flats)
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