Integrating soil-structure interaction within seismic design and assesement of buildings in Canada

虽然一些国际建筑规范和设计准则包含了考虑土-基础-结构相互作用(SFSI)的规定，但它们并没有将上部结构、基础和周围土壤的设计作为一个综合的工程系统来处理。了解和量化建筑结构的全球地震反应对于制定考虑整体结构行为的设计程序至关重要。在基于能力或基于性能的抗震设计框架内应用的这些程序，需要为新建筑和抗震不足的旧建筑提出替代的经济有效的解决方案。*拟议研究计划的长期目标是为浅基础建筑的抗震设计和评估制定综合设计程序，该程序将考虑土-基础-结构系统的所有组成部分的综合作用。这些程序将涉及加拿大西部和东部的地震活动背景，并特别注意对高频地震运动的结构响应的特殊性。这项研究将围绕两个主要主题展开：(I)评估土壤-结构相互作用对根据加拿大现行地震规定设计的建筑物的抗震性能的影响；(Ii)制定包括建筑物-基础-土壤系统的综合反应的设计程序。将对钢筋混凝土剪力墙和钢支撑框架进行研究。在加拿大，这些体系通常用来抵抗地震荷载，由于它们的高刚度，基础/土壤变形对整个体系的灵活性有很大的贡献。将通过广泛的分析研究来研究全球结构对地震激励的反应。将在开源计算平台OpenSees中建立用于非线性时程分析的完整结构模型。设计程序将在基于能力和基于性能的方法的背景下提出，并注意它们是否适合实际使用。*这项研究的结果将有助于更好地了解综合建筑系统的全球地震行为，有助于将新的设计方法引入加拿大的抗震设计条款，并为实践工程师在日常实践中整合SFSI效应提供指导和工具。他们将讨论加拿大东部的地震背景，目前可用的数据量有限。拟议程序的经济影响可能是重大的，特别是对于地震不足的较老的建筑物，对于这些建筑物，应用开发的数值工具和综合方法来分析其抗震性能，可以避免不必要和昂贵的翻新。

Although several international building codes and design guidelines contain provisions to account for soil-foundation-structure interaction (SFSI), they do not address the design of the superstructure, the foundation and the surrounding soil as an integrated engineering system. Understanding and quantifying the global seismic response of building structures is essential to develop design procedures that consider the integrated structural behaviour. Such procedures, applied either within the framework of capacity-based or performance-based seismic design, are needed to put forward alternative cost-effective solutions for new buildings and for seismically deficient older buildings.******The long-term objective of the proposed research program is to develop integrated design procedures for the seismic design and evaluation of buildings on shallow foundations that will consider the combined contributions of all components of the soil-foundation-structure system. These procedures will address the seismicity context of western and eastern Canada with special attention paid to the particularities of the structural response to high-frequency seismic motions. The research will be structured around two main themes: (i) the assessment of the effects of soil-structure interaction on the seismic performance of buildings designed according to current Canadian seismic provisions; and (ii) the development of design procedures that include the integrated response of building-foundation-soil systems. Reinforced concrete shear walls and steel braced frames will be studied. These systems are commonly used in Canada to resist seismic loads and, because of their high stiffness, the foundation/soil deformations can contribute significantly to the overall system flexibility. The global structural response to seismic excitations will be examined through extensive analytical studies. The integrated structural models for nonlinear time history analysis will be built in the open-source computational platform OpenSees. Design procedures will be proposed in the context of capacity-based and performance-based methodologies with attention directed to their suitability for practical use.******The findings of this study will help to better understand the global seismic behaviour of integrated building systems, contribute to introduce new design methods into Canadian seismic design provisions and provide guidelines and tools for practicing engineers to integrate SFSI effects in everyday practice. They will address seismic context of Eastern Canada for which a limited amount of data is presently available. The economical impact of proposed procedures may be significant particularly for the older seismically deficient buildings, for which the application of developed numerical tools and integrated approach to analyse their seismic performance can avoid unnecessary and costly retrofits.