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，突显了我们的建筑环境需要更具抵御地震的能力。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。然而，只要达到生命安全目标，重大的建筑物损坏就被认为是可以接受的。因此，现有和新设计的建筑都容易受到强烈地震的破坏，这可能导致广泛的停机时间，并可能需要拆除和重建。这项研究计划旨在通过提高我们对新建和现有高层建筑带来的地震风险的了解来增强加拿大建筑环境的地震弹性，这些建筑在我们的社会经济活动中发挥着关键作用，它们的弹性对于确保我们的城市在地震后有效地恢复至关重要。虽然加拿大的许多城市认识到自己的地震脆弱性，但提高其恢复力的计划往往受到缺乏对其建筑存量的预期抗震性能或采用不同策略的相关成本的了解的挑战。这项研究计划旨在明确考虑大地震期间建成环境的性能对社会和经济的影响，从而能够进行地震政策决策。长期目标是开发新的方法方法来评估建筑物的地震风险及其对城市复原力的影响。将通过重点关注与高层建筑有关的短期结构工程方面来实现这些目标，这些方面是发展地震灾后恢复能力所必需的：(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；以及(3)开发地震恢复能力指标，为与未来建筑相关的设计决策提供建议，促进更具弹性的施工。目标1的结果将用于评估对易受地震影响的现有高层建筑进行不同的翻新干预措施，以经济有效地降低它们的风险；这些结果将被提炼出来，以便为地震政策提供参考。目标2和目标3将着重说明建筑规范中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就提高抗震性能目标和未来建筑的基于性能的设计要求进行的讨论提供信息。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.