This thesis evaluates the design of Buckling Restrained Braces (BRBs) based on freely available information with respect to design, qualification and implementation. Key sensitivity areas of the BRB are evaluated through experimental testing, numerical analysis and the development of a theoretical model. 37 specimens were experimentally tested to current accepted standards evaluating the key sensitivity areas: restraining mechanism; stroke length; transition gradient; embedment length; and yielding to non-yielding radii. Among the 37 experimental specimens, three were nominally identical, for evaluating the reliability in design performance.

The nominally identical specimens were successful in completing the minimum testing protocol, with the design of these specimens used as the foundation for the development of the empirical and semi-empirical models. Two empirical models were developed, evaluating the design, irrespective of experimental results. These models were unsuccessful. Two further models were investigated, calibrating the yielding core cyclic hardening to that observed experimentally. The final model was successful in response up to 1.0 x drift.

A theoretical model was developed predicting first yield and the maximum compression capacity. The results of this theoretical model, based on the geometric and measured material magnitudes showed that it was conservative in estimating the critical values. The tensile strength of the BRB was 103 % of that measured experimentally and 90 % of the maximum compression strength. This model can be used to develop a backbone curve for BRB assessment.