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 owners*after the 2010 Chile earthquake (M 8.8), the 2011 Tohoku earthquake in Japan (M9), and the 2011 Christchurch aftershock*earthquake in New Zealand (M6.3). Researchers concluded that a resilient structural system should be able to: reduce*probabilities of structure failure, reduce consequences from failures, and reduce recovery time. To achieve this goal, new*developments in the field of damage-resistant technologies are required. Furthermore, the next generation of damage-resistant*buildings 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 including*those with installed passive energy dissipation devices have shown high residual interstorey drift when subjected to large*magnitude earthquakes. Thus, the main objective of this proposal is to develop self-centering devices for CBF buildings, to*characterize the new building system, as well as to quantify their seismic performance factors. More specifically, in this*application, two innovative self-centering systems comprising friction ring springs cartridges and dual-core compressed*elastomer devices are proposed. Both devices are able to act in dual direction, to self-center the system and to provide flag*shape hysteresis response. These proposed self-centering systems will be employed to self-center the CBFs with installed*dissipative pin connections and CBFs equipped with friction damper devices. In addition, an innovative cost-efficient*self-centering energy dissipating brace member is envisioned and designed to replace braces of traditional CBF building*systems. 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 in*terms of the risk of life loss and financial losses including repair and downtime rather than collapse. The resulted performance*curves will be a valuable tool for decision-makers.