Djojo, GaryClifton, CharlesHenry, Richard2016-09-262016-09-262016http://hdl.handle.net/10092/12775Double acting systems are being developed to accommodate upward and downward movements during severe earthquakes in centralised rocking concentrically braced frames (Figure 1a) The systems utilise Ringfeder®, a compression only friction ring spring (Figure 1b), which is designed to work as a double acting spring. The spring dissipates energy through frictions between inner and outer rings and provides self-centring afterwards.enCC-BY 4.0 InternationalConference Contributions - Other