Improving the Seismic Resilience of Steel Braced Frames Using Innovative Technologies

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The post-earthquake structural resilience started to be of particular interest to governments and private businesses ownersafter the 2010 Chile earthquake (M 8.8), the 2011 Tohoku earthquake in Japan (M9), and the 2011 Christchurch aftershockearthquake in New Zealand (M6.3). Researchers concluded that a resilient structural system should be able to: reduceprobabilities of structure failure, reduce consequences from failures, and reduce recovery time. To achieve this goal, newdevelopments in the field of damage-resistant technologies are required. Furthermore, the next generation of damage-resistantbuildings should be able to self-center and to be reparable at an affordable cost.Despite of energy dissipation capacity, commonly, all concentrically braced frame (CBF) building structures includingthose with installed passive energy dissipation devices have shown high residual interstorey drift when subjected to largemagnitude earthquakes. Thus, the main objective of this proposal is to develop self-centering devices for CBF buildings, tocharacterize the new building system, as well as to quantify their seismic performance factors. More specifically, in thisapplication, two innovative self-centering systems comprising friction ring springs cartridges and dual-core compressedelastomer devices are proposed. Both devices are able to act in dual direction, to self-center the system and to provide flagshape hysteresis response. These proposed self-centering systems will be employed to self-center the CBFs with installeddissipative pin connections and CBFs equipped with friction damper devices. In addition, an innovative cost-efficientself-centering energy dissipating brace member is envisioned and designed to replace braces of traditional CBF buildingsystems. Design guidelines, quantification of buildings seismic performance factors, as well as, a framework for life-cycle based design will be provided. For the life-cycle based design method it is intended to consider safety-related performance goals interms of the risk of life loss and financial losses including repair and downtime rather than collapse. The resulted performancecurves will be a valuable tool for decision-makers.