Performance evaluation of self-centring steel-braced frame

A modern self-centring braced frame equipped with post-tensioned cables and replaceable fuses is capable of rocking on its foundation during an earthquake. The aim of this paper is to evaluate the seismic performance of a controlled-rocking braced frame and compare its efficiency with a similar fixed-based braced frame. A non-linear time history analysis is conducted for a set of archetypes, varying in height, seismic design category, and seismic frame type. A sensitivity analysis is performed to examine the effects of modelling and ground motion parameters. Results indicate that the rocking system is capable of enhancing the performance of a conventional braced frame by features such as the controlled rocking mode, self-centring and concentrated damage to replaceable fuses.