A Robust Design of an Innovative Shaped Rebar System Using a Novel Uncertainty Model

N Aldoumani, H Haddad Khodaparast, C Giannetti, Z Abdallah, I Cameron, MI Friswell & J Sienz (Swansea University)

Structural and Multidisciplinary Optimization, Vol. 58, No. 4, October 2018, pp. 1351-1365


The Co-tropic rebar system, which is a modification of the standard steel reinforcing bar in concrete matrices, has been modeled and optimized in the presence of uncertainty. This novel rebar system provides an improvement of 40-70% in the bond strength when compared to the conventional systems under pull-out conditions. The study of the design parameters of this system was carried out utilizing a novel uncertainty model that has recently been developed at Swansea University. The importance of this invention comes from the fact that the whole process has been automated by linking ANSYS Workbench to MATLAB via the in-house written code. This has facilitated the use of a huge number of trials as well as reducing the number of parameters to be studied through the selection of the most sensitive ones. The uncertainty in the design parameters of this rebar system is of a paramount importance in order to optimise the bond strength between the Co-tropic rebar system and the concrete matrix as well as to fully understand the behaviour of the proposed system under pull-out conditions. The interface between the rebar and the concrete matrix was assumed as a 'cohesive zone' whereby the interfacial area is studied as a function of the bonding strength.

Paper Availability

This material has been published in the Structural and Multidisciplinary Optimization, Vol. 58, No. 4, October 2018, pp. 1351-1365. The paper is published as an open access paper.

Link to paper using doi: 10.1007/s00158-018-2050-z

Link to PDF on journal website

Structural and Multidisciplinary Optimization