Performance-Based Assessment Techniques for Seismic Evaluation and Retrofit of Steel Structures Under Design and Extreme Earthquakes

设计及极端地震钢结构抗震评估与改造的基于性能的评估技术

• 批准号: 402338-2012
• 负责人: Lignos, Dimitrios
• 金额: $ 1.72万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=573249
• 关键词: Performance; Based; Assessment; Techniques; Seismic

In recent years, several large magnitude earthquakes have occurred (Northridge 1994, Japan, New Zealand, 2011), which have demonstrated the collapse potential of buildings designed in accordance with current and past seismic provisions. The Canadian Risk and Hazards Network indicates that a design level earthquake is probably Canada's greatest potential natural threat since most of the urban infrastructure was constructed prior to the introduction of modern seismic provisions. The Canadian Seismic Network concluded that a significant earthquake is likely to occur in the east and west coast of Canada. Hence the collapse potential of Canadian infrastructure needs to be assessed using a rigorous framework that will contribute to informed decisions in the best interest of society. This will also help stakeholders to make informed decisions on seismic mitigation that will guarantee seismic resilience of critical infrastructure. In the context of earthquake resistant design, this framework needs to be practical and feasible so that engineers can (1) use assessment techniques to derive structural properties that comply with specific targets for a required level of collapse safety and (2) decide on effective retrofit techniques for critical infrastructure. The proposed research program addresses these issues by: 1. The development of hysteretic models that extend modeling capabilities of structural elements such as beams and columns near collapse through experimental testing; Improvement of national and international seismic design guidelines through development of innovative collapse mitigation strategies; 2. advancing on new ways on seismic retrofit of existing buildings; evaluating the effectiveness of alternative retrofit systems with economic losses as a metric; and by, 3. training of Highly Qualified Personnel (HQP) and developing technology transfer mechanisms to disseminate knowledge to end users and stakeholders on how to increase the seismic robustness of infrastructure.

近年来，发生了几次大规模地震（Northridge 1994，日本，New 新西兰，2011年），这表明，根据设计的建筑物的倒塌潜力 与当前和过去的抗震规定。加拿大风险和灾害网络表明，设计水平地震可能是加拿大最大的潜在自然威胁，因为大多数城市基础设施是在采用现代抗震规定之前建造的。加拿大地震台网的结论是，加拿大东西海岸很可能发生重大地震。因此，加拿大基础设施的崩溃潜力需要使用一个严格的框架进行评估，这将有助于做出符合社会最佳利益的明智决定。这也将有助于利益攸关方就防震减灾作出知情决定，以保证关键基础设施的抗震能力。在抗震设计的背景下，这个框架需要是实用和可行的，以便工程师可以（1）使用评估技术，以获得符合特定目标的倒塌安全水平的结构特性和（2）决定有效的改造技术的关键基础设施。拟议的研究方案通过以下方式解决这些问题： 1.开发滞回模型，通过实验测试扩展结构元件（如梁和柱）接近倒塌时的建模能力;通过开发创新的倒塌缓解战略，改进国家和国际抗震设计准则; 2.推进现有建筑物抗震改造的新方法;以经济损失为衡量标准评估替代改造系统的有效性;以及， 3.培训高素质人员（HQP）和发展技术转让机制，向最终用户和利益相关者传播如何提高基础设施抗震能力的知识。