Behavior of stub girder floor system with partial shear connection

Abstract

A stub-girder floor system is a composite system constructed from a continuous steel beam and a reinforced concrete slab separated by a series of short, typically wide, flange sections called stubs. The finite element method has been used in the analysis of this composite system where it is capable to represent the constituent parts, adopt adequate elements and use appropriate solution techniques. As the behavior of stub-girders presents significant nonlinear effects, it is fundamental that the interaction of all different components should be properly modeled as well as the interface behavior. The present work focuses on the modeling of stub-girders with full and partial shear connection in two and three dimensions. The proposed model contains all the main structural parameters and their associated nonlinearities (concrete slab, steel beam, stubs, and shear connectors). In this model, the shear connectors are modeled as springs to consider the geometry of studs in addition to the nonlinearity due to the interaction between the shear connector and the concrete slab. Tests and numerical results available in the literature are used to validate the models. Based on the proposed finite element model, an extensive parametric study of stub-girders is performed, considering the material properties, relative dimensions and shear connector characteristics, where valuable recommendations and conclusions are achieved.ª 2010 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V.All rights reserved.

State of the art report on stub girder flooring systems

“…Thus, any design approach process has significant effect on the general design of stub girders. The three approaches that define the behavior of stub girders are now explained (Ellobody, 2011, 2012; Hrabok and Hosain, 1978; Lam et al, 1977; Lee et al, 1986; Mashaly et al, 2010; Queiroz et al, 2007; Wang et al, 1995).…”

“…Laboratory tests can be costly, and in some cases not feasible to carry out, in a typically sized structural laboratory. This is where the finite element approach has become an effective instrument for the analysis of a great number of structural engineering analyses (Ellobody, 2011, 2012; Mashaly et al, 2010; Queiroz et al, 2007).…”

“…However, in a comprehensive analysis of any structural system, the presence of the experimental phase is necessary to verify the numerical results. Numerical approaches need to be calibrated to reliable test outcomes, and experimental and numerical/theoretical analyses complement each other in the analysis of special structural phenomena (Abdollahi, 1996; Mashaly et al, 2010; Nethercot, 2002; Queiroz et al, 2007). A symmetrical finite element model of stub girder flooring to reduce computational efforts and time which have done by Matshaly et al (2010) has been show in Figure 8.…”

Ultimate Behavior of Composite Castellated Beams under Vertical Loads

“…This parameter is studied through the use of different concrete compressive strengths (34&40 MPa) in the slab and in the associated push-out tests represented by the load-slip curves of shear connectors, Gatesco (1999) and Mashaly et. al.…”

Finite Element Modeling Of Partially Composite Castellated Beams

“…Concrete strength of 34 MPa, which was used in the verified experiments, is used in the parametric study with the corresponding load-slip curve shown before in Figure 6. The load-slip curve of the shear connectors for concrete strength of 40 MPa is shown in Figure 36, Mashaly et. al.…”