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(9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震后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：减少结构故障的可能性，减少故障的后果，并缩短恢复时间。为了实现这一目标，需要在抗破坏技术领域取得新的进展。此外，下一代抗损伤建筑应该能够自我中心，并且能够以负担得起的成本进行修复。尽管具有耗能能力，但通常所有的中心支撑框架(CBF)建筑结构，包括那些安装了被动耗能装置的结构，在遭受大地震时都表现出较高的残余层间漂移。因此，这项提议的主要目标是为CBF建筑开发自定心装置，以确定新建筑系统的特征，以及量化其抗震性能因素。更具体地说，在这一应用中，提出了两种创新的自定心系统，包括摩擦环弹簧盒和双芯压缩橡胶装置。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有耗散销连接的CBF和配备摩擦阻尼器的CBF的自定心。此外，还设想和设计了一种创新的高性价比的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，它旨在考虑与安全相关的性能目标，包括生命损失风险和财务损失，包括维修和停机时间，而不是坍塌。由此产生的绩效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 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.