Improving the Seismic Resilience of Steel Braced Frames Using Innovative Technologies

地震后的结构性弹性开始引起政府和私营企业主的特别兴趣 在2010年智利8.8级地震、2011年日本东北9级地震和2011年克赖斯特彻奇余震之后 新西兰发生6.3级地震。研究人员得出结论，一个有弹性的结构系统应该能够：减少 减少结构故障的概率，减少故障的后果，并缩短恢复时间。为了实现这一目标，新的 需要在抗损害技术领域取得进展。此外，下一代抗损伤 建筑物应该能够自我居中，并且能够以负担得起的成本进行维修。 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 安装了被动耗能装置的那些，当受到较大的 震级地震。因此，这项建议的主要目标是为CBF建筑物开发自定心装置，以 确定新建筑体系的特征，以及量化它们的抗震性能因素。更具体地说，在这个 应用，两个创新的自定心系统，包括摩擦环弹簧盒和双芯压缩 提出了弹性体器件的概念。这两个设备都能够双向操作，以使系统自我居中并提供标志 整形滞后响应。这些拟议的自定心系统将用于对已安装的CBF进行自定心 耗散销连接和装有摩擦阻尼器装置的CBF。此外，创新的高性价比 提出并设计了自中心消能支撑构件来替代传统CBF建筑中的支撑 系统。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 生命损失和财务损失的风险，包括维修和停机，而不是坍塌。由此产生的性能 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.