Experimental and Numerical Assessment of the Behaviour of Rubberized Concrete Filled Steel Tube Members Under Monotonic and Cyclic Bending


Abstract eng:
The main objective of the research presented in this paper is to investigate the structural behaviour of Concrete Filled Steel Tube (CFST) columns made with Rubberized Concrete (RuC), and to identify behavioural differences between this type of composite members and typical CFST members made with standard concrete (StdC), namely in terms of the influence of the rubber aggregate replacement ratio on member strength, ductility, and energy dissipation capacity. The paper describes the preparation and development of an experimental campaign (Silva et al [1]), which involves the testing of 36 specimens of different cross-section types. The definition of the test campaign considered a number of parameters, namely crosssection slenderness, aggregate replacement ratio, axial load level and lateral loading type. A special device was developed as part of an innovative testing setup, aimed at reducing both the cost and preparation time of the specimens. The specimens were tested under both monotonic and cyclic lateral loading conditions and considering different levels of normalized axial load. This paper also describes the comparison of the test results with codified design provisions, namely with Eurocode 4 [2]. Additionally, an advanced numerical model for CFST columns is proposed using the finite element software ABAQUS [3], aimed at the accurate modelling of CFST behaviour in monotonic and cyclic bending, simple or combined with compression. A concrete damage plasticity model was adopted to represent the concrete damage under cyclic loading. A procedure was developed to take into account the steel tube’s initial imperfection in the numerical analysis, and no significant sway of CFST behaviour in bending. The validity of the developed finite element model was examined by comparing the experimental results of the 36 CFST columns with the numerical results. It was found that, for both monotonic and cyclic lateral loading, not only the numerical test results show a good correlation, but also the local buckling of the steel tube is accurately captured by the model. Conservative prediction was found when compared the design capacity with Eurocode 4 [2] for both circular and square/rectangular CFST. An over-strength phenomenon was also indicated by the test results of circular CFST under monotonic bending.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4310.:
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