Enhancing the Seismic Resilience of Canada's Built Environment through Comprehensive Risk-Based Assessments of New and Existing Tall Buildings

对加拿大西海岸和东海岸可能发生的地震的影响进行的研究表明，直接经济损失可能分别超过700亿美元和600亿美元。这些损失主要是由于地震对建筑物和基础设施的破坏，突出表明我们的建筑环境需要更好地抵御地震。建筑规范的主要目标之一是在极端地震中提供可接受的安全性。然而，只要满足生命安全目标，重大建筑物损坏被视为可以接受。因此，现有和新设计的建筑物都容易受到强震的破坏，这可能导致长时间的停工，并可能需要拆除和重建。该研究计划旨在通过提高我们对新的和现有的高层建筑所带来的地震风险的理解来提高加拿大建筑环境的抗震能力，这些高层建筑在我们的社会经济活动中发挥着关键作用，其恢复能力对于确保我们城市的有效震后恢复至关重要。 虽然加拿大的许多城市认识到它们的地震脆弱性，但提高其恢复力的计划往往受到缺乏对其建筑物预期抗震性能或采用不同策略相关成本的了解的挑战。该研究计划旨在使地震政策决策明确考虑在大地震期间建筑环境性能的社会和经济影响。长期目标是制定新的方法，以评估建筑物的地震风险及其对城市复原力的影响。这些目标将通过关注与高层建筑相关的短期结构工程方面来实现，这是发展地震灾害恢复能力所必需的：（1）通过开发针对加拿大高层建筑存量的工具和数据，提高城市风险模型的质量和准确性;（2）量化未来高层建筑基于性能的抗震设计的成本和收益;及（3）发展抗震能力指标，为未来建筑物的设计决策提供建议，促进更具抗震能力的建筑。 目标1的结果将用于评估现有易受地震影响的高层建筑的不同改造干预措施，以经济有效地降低其风险;将提取结果以告知地震政策。目标2和目标3将强调建筑规范隐含的生命安全目标是否足以确保城市的抗震能力，并将为加拿大国家建筑规范地震设计常设委员会关于加强未来建筑的抗震性能目标和基于性能的设计要求的讨论提供信息。该计划还将为加拿大地震工程界的未来成员提供最先进的培训。

Studies on the impacts of likely earthquake scenarios in the Canadian West and East Coasts suggest that direct financial losses can exceed $70 billion and $60 billion, respectively. These losses, primarily due to seismic damage to buildings and infrastructure, highlight the need for our built environment to be more resilient to earthquakes. One of the primary objectives of building codes is to provide acceptable safety in extreme earthquakes. However, significant building damage is considered acceptable as long as the life-safety objective is met. As a result, both existing and newly designed buildings are susceptible to damage from strong earthquakes, which could result in extensive downtime and potential need for demolition and reconstruction. This research program aims to enhance the seismic resilience of Canada's built environment by improving our understanding of the seismic risks posed by new and existing tall buildings, which play a key role in our socio-economic activity and their resilience is vital to ensuring effective post-earthquake recovery of our cities. While many cities in Canada recognize their seismic vulnerability, programs to improve their resilience are often challenged by a lack of understanding of the expected seismic performance of their building stock or the costs associated with adopting different strategies. This research program aims to enable seismic policy decision-making with explicit consideration of the societal and economic impacts of the performance of the built environment during major earthquakes. The long-term objectives are to develop new methodological approaches to assess seismic risk in buildings and their implications on urban resilience. These will be achieved by focusing on short-term structural engineering aspects related to tall buildings, which are required to develop earthquake disaster resilience: (1) advance the quality and accuracy of urban risk models by developing tools and data specific to the tall building stock in Canada; (2) quantify costs and benefits of performance-based seismic design of future tall buildings; and (3) develop seismic resilience indicators to advise design decisions related to future buildings, promoting more resilient construction. The results from Objective 1 will serve to evaluate different retrofit interventions in seismically vulnerable existing tall buildings to cost-effectively mitigate their risk; results which will be distilled to inform seismic policy. Objectives 2 and 3 will highlight whether the implicit life-safety objective of building codes is sufficient to ensure the seismic resilience of cities and will inform discussions by the Standing Committee on Earthquake Design of the National Building Code of Canada related to enhanced seismic performance objectives and performance-based design requirements for future construction. This program will also provide state-of-the-art training to future members of Canada's earthquake engineering community.