Improving the Seismic Resilience of Steel Braced Frames Using Innovative Technologies

在2010年智利地震（里氏8.8级）、2011年日本东北地震（里氏9级）和2011年新西兰克赖斯特彻奇余震（里氏6.3级）之后，震后结构恢复能力开始引起政府和私营企业主的特别关注。研究人员得出结论，弹性结构系统应该能够：降低结构失效的概率，减少失效的后果，并缩短恢复时间。为了实现这一目标，需要在抗损伤技术领域取得新的发展。此外，下一代抗破坏建筑应该能够以自我为中心，并且能够以可承受的成本进行修复。****尽管具有消能能力，但通常情况下，所有的同心支撑框架（CBF）建筑结构，包括那些安装了被动消能装置的建筑结构，在遭受大地震时都表现出较高的剩余层间漂移。因此，本提案的主要目标是为CBF建筑开发自定心装置，以表征新的建筑系统，并量化其抗震性能因素。更具体地说，在这个应用中，提出了两种创新的自定心系统，包括摩擦环弹簧盒和双核压缩弹性体装置。这两种装置都能够双向工作，使系统自中心，并提供旗形滞后响应。这些提出的自定心系统将用于安装耗散引脚连接的cbf和配备摩擦阻尼器装置的cbf的自定心。此外，一种创新的经济高效的自定心耗能支撑构件被设想和设计，以取代传统CBF建筑系统的支撑。将提供设计指南，量化建筑物抗震性能因素，以及基于生命周期的设计框架。对于基于生命周期的设计方法，其目的是考虑与安全相关的性能目标，包括生命损失和经济损失的风险，包括维修和停机时间，而不是崩溃。所得的性能曲线将成为决策者的宝贵工具。

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.