Improving the Seismic Resilience of Steel Braced Frames Using Innovative Technologies

在2010年智利地震(8.8级)、2011年日本东北地震(M9级)和2011年新西兰克赖斯特彻奇余震*(6.3级)之后，政府和私营企业主开始对地震后的结构弹性特别感兴趣。研究人员得出结论，一个有弹性的结构系统应该能够：减少结构故障的概率，减少故障造成的后果，并缩短恢复时间。为了实现这一目标，需要在抗损害技术领域取得新的发展。此外，下一代抗损伤*建筑应该能够自我居中，并且能够以负担得起的成本进行修复。*尽管具有耗能能力，但通常情况下，所有中心支撑框架(CBF)建筑结构，包括那些安装了被动耗能装置的建筑结构，在遭受*级大地震时都表现出较高的残余层间漂移。因此，这项建议的主要目标是为CBF建筑开发自定心装置，以*描述新建筑系统的特征，以及量化其抗震性能因素。更具体地说，在这个*应用中，提出了两个创新的自定心系统，包括摩擦环弹簧盒和双芯压缩弹性体装置。这两个设备都能够双向工作，使系统自我对准，并提供旗形滞后响应。这些建议的自定心系统将被用于安装了*耗散销连接的CBF和配备了摩擦阻尼器的CBF的自定心。此外，还设想和设计了一种创新的高性价比*自定心消能支撑构件，以取代传统CBF建筑*系统的支撑。将提供设计指南、建筑物抗震性能因素的量化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，它的目的是考虑与安全有关的性能目标，包括生命损失和财务损失的风险，包括维修和停机时间，而不是坍塌。由此产生的性能*曲线将是决策者的宝贵工具。

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.