Rocking Shallow Foundation for Improving Seismic Performance of Soil-Structure Systems

摇摆浅基础提高土壤结构系统的抗震性能

• 批准号: RGPIN-2014-04707
• 负责人: Deng, Lijun
• 金额: $ 1.75万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=649003
• 关键词: Rocking; Shallow; Foundation; Improving; Seismic

It is generally unknown that Canada experiences a relatively high amount of seismic activity and that more than 40% of Canadians live in areas subjected to moderate to high risk of loss from earthquakes. With the Cascadia subduction zone in western Canada and several active faults in the east, it is inevitable that large and damaging earthquakes will strike Canada again in the future. The design of structural systems that maintain their integrity during and after major earthquakes is a crucial part of earthquake resistant design and research. *The proposed research will investigate the use of innovative rocking foundations as an alternative to conventional fixed-base foundations to improve the seismic performance of building systems. Rocking foundations allow the spread footings to rock and uplift partially from underlying soil, which can effectively reduce the permanent rotation and the collapse potential of structures and are more cost-effective. The main objectives of the research are to characterize the fundamental behaviour of rocking foundations in the field and to develop a seismic design guideline of rocking foundations for modular steel buildings (MSB) - an innovative type of building. *The research will conduct large-scale field tests to characterize the moment-rotation-settlement correlation, load bearing mechanism and energy dissipation capability of rocking foundations. To assist in the seismic design and analyses of buildings, a constitutive model for rocking foundations will be developed based on the test results. To apply the principle of rocking foundations in practice, the research will implement rocking foundations in emerging MSB, investigate the cyclic performance of the buildings using centrifuge model tests and develop a seismic design guideline for MSB designed with rocking foundations. *The outcome of the research is expected to provide the industry with a feasible seismic design method for rocking foundations implemented in MSB, which will introduce the benefits of using rocking foundations to protect buildings from earthquake risks. Ultimately, this research will promote the application of rocking foundations to improve the seismic performance of buildings and contribute to more earthquake-resistant infrastructure in Canada.

加拿大经历了相对较高的地震活动，超过40%的加拿大人生活在遭受地震损失的中度到高度风险的地区。由于加拿大西部的卡斯卡迪亚俯冲带和东部的几个活动断层，未来加拿大将不可避免地再次发生大地震和破坏性地震。在大地震期间和之后保持其完整性的结构系统的设计是抗震设计和研究的重要组成部分。* 建议的研究将探讨采用创新的摇摆式基础，以取代传统的固定基础，从而改善建筑系统的抗震性能。摇摆基础允许扩展基脚摇摆并部分地从下面的土壤中隆起，这可以有效地减少结构的永久旋转和倒塌的可能性，并且更具成本效益。研究的主要目标是描述摇摆基础在该领域的基本行为，并为模块化钢结构建筑（MSB）-一种创新的建筑类型-制定摇摆基础的抗震设计指南。* 研究将进行大型现场试验，以确定摇摆基础的弯矩-旋转-沉降关系、承载机理和耗能能力。为了协助建筑物的抗震设计和分析，将根据试验结果建立摇摆基础的本构模型。为了将摇摆基础的原理应用于工程实践，本研究将在新兴的MSB中实施摇摆基础，通过离心模型试验研究建筑物的循环性能，并为摇摆基础设计的MSB制定抗震设计指南。* 研究结果预期可为业界提供一套可行的摇摆式地基抗震设计方法，介绍摇摆式地基在保护建筑物免受地震风险方面的好处。最终，这项研究将促进摇摆基础的应用，以提高建筑物的抗震性能，并有助于在加拿大更多的抗震基础设施。