Experimental and Finite Element Investigation on the Load – Slip Behavior of Composite Push Out Segments Using Various Shear Connectors

Raji M. AL-Alusi, Mohammed; Ibrahim Aziz, Khalil; Khalid Al- Hadithy, Laith

	Experimental and Finite Element Investigation on the Load – Slip Behavior of Composite Push Out Segments Using Various Shear Connectors
Journal of Engineering
Article 1, Volume 15, Issue 3, 2009, Pages 4087-4111
Authors
Mohammed Raji M. AL-Alusi; Khalil Ibrahim Aziz; Laith Khalid Al- Hadithy
Abstract
The study described herein deals with experimental and finite element modeling of a variety of composite steel-concrete column segments using shear connectors of different shapes and sizes to provide resistance to slip at steel – concrete interfaces. Hence , it represents a qualitative transition in the experimental and analytical investigations on shear connectors effectivity at steel – concrete interfaces , as most studies in the field of shear connectors were devoted to composite beam and slab – systems . Three types of shear connectors – with four concrete grades for each type – were used in fabricating composite specimens . The twelve composite prototypes were subjected to push – out test individually to examine their behavior by measuring the slip values for each load incremental till failure , thus determining the resistance extent of each connectors type and specifying the failure mode at interface . A nonlinear three – dimensional finite element analysis have been carried out on twelve composite column segments using ANSYS computer program (5 th version , 2002) to investigate their behavior and predict their load – slip relationships , equivalent stress distributions and concrete cracking patterns . The defined numerical modeling included using the eight node isoparametric brick element with smeared reinforcement (SOLID 65) and the eight node isoparametric steel brick element (SOLID45) , to model the reinforced concrete medium and the steel section and shear connectors , respectively , considering perfect bond between concrete and steel reinforcing bars . Nonlinear properties including cracking and crushing of concrete , yielding of steel section and reinforcement , and nonlinear bond – slip at interface were also considered . Comparison of the experimental and theoretical results has shown good agreement that verifies the accuracy of the finite element model based on the smeared crack model of concrete . Results have detected the development of the relative movement (slip) be at all ranges of the load-slip relationship at interface even with using effective shear connection and /or high quality concrete. The headed studs have revealed the highest slip resistance and ultimate load over the channel and the L-shaped studs . The high strength concrete has also revealed the same superiority over the other three tested types of concrete .

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