Techno Press

Steel and Composite Structures   Volume 28, Number 4, August25 2018, pages 449-460
Shear transfer mechanism in connections involving concrete filled steel columns under shear forces
Silvana De Nardin and Ana Lucia H.C. El Debs

Abstract     [Full Text]
    This paper reports the experimental results of three through bolt beam-column connections under pure shear forces using modified push-out tests. The investigated specimens include extended end-plates and six through-bolts connecting square concrete-filled steel tubular column (S-CFST) to steel beams. The main goal of this study is to investigate if and how the mechanical shear connectors, such as steel angles and stud bolts, contribute to the shear transfer mechanisms in the steel-concrete interface of the composite column. The contribution of shear studs and steel angles to improve the shear resistance of steel-concrete interface in through-bolt connections was investigated using tests. The results showed that their contribution is not significant when the beam-column connection is included in the push-out tests. The specimens failed by pure shear of the long bolts, and the ultimate load can be predicted using the shear resistance of the bolts under shear forces. The predicted values of load allowed obtaining a good agreement with the tests results.
Key Words
    beam-to-column connection; shear forces; through-bolt connection; steel-concrete interface; mechanical connectors
(1) Silvana De Nardin:
Department of Structural Engineering, University of Sao Paulo, Sao Carlos, Avenida Trabalhador Saocarlense 400, Centro, Sao Carlos-SP - CEP: 13.566-590, Brazil;
(2) Ana Lucia H.C. El Debs:
Department of Civil Engineering, Federal University of Sao Carlos, Rod. Washington Luis km 235 - SP-310 - Sao Carlos, CEP 13565-905, Brazil.

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