Abstract
Abstract The composite structures have great advantages in terms of structural and constructive aspects, with the shear connectors being decisive for obtaining the interaction between the structural elements and for the distribution of the stresses in the structure, taking advantage of the potentiality of each constituent material of the composite structure (steel and concrete). This work, through experimental studies, presents the development of a shear connector (Truss connector) proposed for use in a concrete-steel composite beam. The proposed connector is easy to implement and can serve as a viable alternative to the use of stud or U connectors. It was idealized a connector geometry that would provide low production cost, ease of execution, higher values of resistant load, efficiency as regards the relative sliding resistance between the metal profile and the concrete slab, as well as the efficiency regarding the resistance to the spacing of the slabs in relation to the metal profile (uplift). In order to evaluate the behavior of Truss connectors, 6 experimental models were constructed for push-out tests, 3 with 12.5 mm diameter Truss connectors and 3 with 19.0 mm diameter stud bolt connectors. The behavior of the models was investigated with respect to the loads of rupture, the transversal displacements between the concrete slabs and the relative vertical slide between the reinforced concrete slabs and the metallic profiles of the models. The results of the experimental analyzes provided an overview of the operation of the Truss and stud bolt connectors, with significant results that showed advantages of the Truss connector in relation to the stud connector considering the parameters analyzed in this work.
Highlights
Technical, scientific, and economic development has brought forth a great variety of structural systems, amongst them steel-concrete composite structures, which prove efficient both structurally and in regards to the ease of construction
The choice of the type and dimensions of the connectors is of great importance, for it is through them that one determines the degree of interaction and the manner in which the stresses are distributed between the materials
The most widely used shear connector for composite beams is the stud bolt, with design criteria specified in the Brazilian Standard ABNT NBR 8800:2008 [2], which presents the design methodology for the “U” type connectors for composite steel and concrete structures
Summary
Scientific, and economic development has brought forth a great variety of structural systems, amongst them steel-concrete composite structures, which prove efficient both structurally and in regards to the ease of construction. Experimental and numerical studies are important means to gaining a better understanding of the behavior of these connectors and the way composite steel-concrete structures work. Other recent works have addressed the study of alternative connectors, developed with the use of materials well known to the construction industry, as may be observed in the research conducted by Barbosa (2016) [8]. He used steel reinforcement bars for reinforced concrete of the CA-50 variety for the manufacturing of new types of shear connectors.
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