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Structural Engineering and Mechanics Volume 71, Number 3, August10 2019 , pages 233-244 DOI: https://doi.org/10.12989/sem.2019.71.3.233 |
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An interface model for the analysis of the compressive behaviour of RC columns strengthened by steel jackets |
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Giovanni Minafò
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| Abstract | ||
| Steel jacketing technique is a retrofitting method often employed for static and seismic strengthening of existing reinforced concrete columns. When no continuity is given to angle chords as they cross the floor, the jacket is considered \"indirectly loaded\" which means that the load acting on the column is transferred partially to the external jacket through interface shear stresses. The evaluation of load transfer mechanism between core and jacket is not straightforward to be modeled, due to the absence of knowledge of a proper constitutive law of the concrete-to-steel interface and to the difficulties in taking into account the mechanical nonlinearities of materials. This paper presents an incremental analytical/numerical approach for evaluating the compressive response of RC columns strengthened with indirectly loaded jackets. The approach allows calculating shear stresses at the interface between core and jacket and predicting the axial capacity of retrofitted columns. A proper constitutive law is proposed for modelling the interaction between the steel and the concrete. Based on plasticity rules and the non-linear behaviour of materials, the column is divided into portions. After a detailed parametric analysis, comparisons are finally made by theoretical predictions and experimental results available in the literature, showing a good agreement. | ||
| Key Words | ||
| steel jacketing; no-end connections; retrofit; interface | ||
| Address | ||
| University of Palermo, Department of Engineering, Viale delle Scienze Ed.8, 90128 Palermo, Italy | ||