Abstract
© 2018 by the authors; licensee Growing Science, Canada. This paper presents a study on the structural performance of a modified shear-head assembly for edge steel column embedded in reinforced concrete slab. The structural performance was investigated in terms of punching shear capacity of the reinforced concrete flat slab. The study consisted of a laboratory punching shear test on the contra-flexure bound slab of dimension 1060mm × 1250mm by 130mm thick in a reactant test frame using a 500kN load cell. Results of the experimental study was validated using finite element based numerical method. Both experimental and numerical results show that increase in tensile strength of concrete, increases punching shear capacity of the connection. It was also observed that punching shear failure of the connection depended largely on concrete shear strength. This study has also revealed that punching shear occurs when concrete shear strength is reached, irrespective of the robustness of the shearhead connection.
Highlights
Flat slab system is increasingly popular in the construction industry in recent time due to its structural and architectural merits
All design codes for punching shear emphasis reinforced concrete flat slab supported on RC column; which limits the applicability of steel column in flat slab design
Local deformation was very significant at the slab-column connection as depicted in Fig. 6b, and it was observed that the shear-heads deformed plastically prior to punching shear failure
Summary
Flat slab system is increasingly popular in the construction industry in recent time due to its structural and architectural merits. Based on the shortcomings of the previous test, Eder, et al (2012) design a robust shear-head system for connecting reinforced concrete flat slabs to tubular steel columns. Yan and Wang (2016) performed a comprehensive parametric study to investigate the influence of different design parameters on the punching shear resistance of hybrid flat slab with shear-head to interior steel tubular column connection. Results obtained from their numerical simulation correlated well with the BS8110 and Eurocode 2 codes equations. Test results were used for the development of analytical models which relates the rotational response, flexural strength and punching strength as a function of shearhead embedment length, layout and section size. Bompa and Elghazuoli (2017) studied the performance of shear-head systems in hybrid RC flat slab to steel column systems via a series of numerical parametric assessments in which key influential materials and geometric parameters were investigated
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