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

人们通常不知道，加拿大经历了相对频繁的地震活动，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。加拿大西部有卡斯卡迪亚俯冲带，东部有几条活动断层，未来加拿大将不可避免地再次发生破坏性大地震。结构体系在地震中和地震后保持其完整性的设计是抗震设计和研究的重要组成部分。*拟议的研究将调查使用创新的摇摆基础作为传统固定基础的替代品，以改善建筑系统的抗震性能。摇摆基础使铺展式基础能够晃动并部分脱离下垫土，可以有效降低结构的永久旋转和倒塌可能性，具有较高的经济效益。本研究的主要目的是描述现场摇摆基础的基本行为，并制定模块化钢结构建筑（MSB）摇摆基础的抗震设计指南-一种创新的建筑类型。*本研究将进行大型现场试验，以表征摇摆基础的弯矩-转动-沉降关系、承载机制和耗能能力。为了协助建筑物的抗震设计和分析，将根据试验结果开发一个摇晃基础的本构模型。为了将摇摆基础原理应用于实践，本研究将在新兴的MSB中实施摇摆基础，利用离心模型试验研究建筑物的循环性能，并制定基于摇摆基础的MSB抗震设计指南。*研究结果预期可为业界提供一套可行的抗震设计方法，让业界了解使用摇晃地基保护建筑物免受地震风险的好处。最终，本研究将促进摇摆基础的应用，以提高建筑物的抗震性能，为加拿大更多的抗震基础设施做出贡献。

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.