Innovative Self-Centering Braces for Advanced Seismic Performance

创新的自定心支架具有先进的抗震性能

• 批准号: 0856555
• 负责人: Larry Fahnestock
• 金额: $ 14.28万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0856555&HistoricalAwards=false
• 关键词: Innovative; Self; Centering; Braces; Advanced

Buckling-restrained braces are currently being used as primary lateral-force resisting elements for buildings in high seismic regions. After strong ground shaking buildings containing buckling-restrained braces are likely to be permanently deformed and thus their repairs may not be feasible. Since it is desirable to develop structural systems that self-center and have no permanent deformation, this project will investigate the use of innovative self-centering buckling-restrained braces as seismic protective devices in buildings. The proposed self-centering buckling-restrained brace consists of a novel configuration of steel tubes and anchorage plates installed with super-elastic shape-memory alloy rods to provide a self-centering mechanism with predictable and stable energy dissipation. The primary objective of the proposed research is to conduct experimental and numerical studies that establish a sound basis for application of the proposed protective system in practice. Large-scale prototype self-centering buckling-restrained braces will be tested to verify the anticipated brace behavior and to examine the effect of critical brace parameters. Numerical models will be developed and validated for use in parametric component studies and braced frame earthquake simulations. The results from the experimental and numerical studies will be used to develop design and fabrication guidelines for practical implementation of self-centering buckling-restrained braces in earthquake-resistant structural systems.The use of the proposed self-centering buckling-restrained brace system has the potential to significantly limit earthquake damage and economic loss in building structures. The proposed protective system can be easily substituted for conventional steel braces or buckling-restrained braces, and this ease of use will make it especially attractive to practicing engineers and contractors. The use of self-centering buckling-restrained braced frame systems, which can be designed to withstand large earthquakes with little to no damage, has the potential for significant broader impact on earthquake affected communities by providing buildings with immediate occupancy performance. This project will also provide unique learning opportunities and training to undergraduate and graduate students as they actively participate in the development of this advanced protective system.

屈曲约束支撑目前被用作高地震区建筑物的主要抗侧力构件。在强烈的地面震动后，含有屈曲约束支撑的建筑物可能会发生永久变形，因此它们的修复可能是不可行的。由于人们希望开发的结构系统，自我中心，没有永久变形，本项目将研究使用创新的自定心屈曲约束支撑作为建筑物的地震保护装置。建议自定心屈曲约束支撑由一种新的配置钢管和锚固板安装超弹性形状记忆合金杆，提供一个自定心机制，可预测的和稳定的能量耗散。拟议的研究的主要目标是进行实验和数值研究，建立一个良好的基础，在实践中应用拟议的保护系统。将对大型自定心屈曲约束支撑原型进行试验，以验证预期的支撑性能，并检查关键支撑参数的影响。将开发和验证数值模型，用于参数化构件研究和支撑框架地震模拟。实验和数值研究的结果将被用于制定设计和制造指南，以实际实施的自定心屈曲约束支撑在抗震结构system.The建议自定心屈曲约束支撑系统的使用有可能显着限制地震破坏和经济损失的建筑结构。建议的保护系统可以很容易地取代传统的钢支撑或屈曲约束支撑，这种易用性将使它特别有吸引力的执业工程师和承包商。自对中屈曲约束支撑框架系统的使用，可以设计为承受大地震，几乎没有损坏，有可能对地震影响的社区提供直接占用性能的建筑物显着更广泛的影响。该项目还将为本科生和研究生提供独特的学习机会和培训，因为他们积极参与这种先进的保护系统的开发。