Soil and Foundation Improvement Solutions for Seismic Resistant Design

抗震设计的土壤和地基改良解决方案

• 批准号: RGPIN-2018-05338
• 负责人: TofighRayhani, Mohammad
• 金额: $ 2.26万
• 依托单位: Carleton University
• 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=666926
• 关键词: Soil; Foundation; Improvement; Solutions; Seismic

The upgraded seismic loading included in the revised national building code (NBCC 2005) postulates an increased seismic hazard in Canada. Most existing structures, including major infrastructure (e.g. nuclear power plants, bridges, etc.), were designed and constructed prior to these new design guidelines and are still susceptible to earthquake damage. In addition, failures of buildings during recent earthquakes due to excessive settlement and/or rotation of foundations have highlighted the importance of designing foundations that can withstand the seismic forces acting on the supported structure. Therefore, there is a need to accurately characterize the seismic risk for critical infrastructure systems and to provide innovative solutions for seismic resistant foundations for new and existing structures. ******The research program proposed here aims at developing innovative techniques for enhancing the lateral load capacity of existing foundations and developing new techniques for constructing earthquake-resistant foundation systems. The specific objectives of this research are: a) to evaluate the seismic site response and soil-structure interaction (SSI) effects on foundation input motion in soft soils; b) explore efficient foundation systems suitable for resisting seismic loads, and c) develop innovative retrofitting techniques for foundations of existing structures. Both experimental and numerical analyses will be employed to conduct this research. Shaking table tests will be conducted to study seismic site response and soil-structure interaction, as well as dynamic response of Fiber Reinforced Polymer piles. Pile load tests will also be used to examine the axial and lateral capacity of different reinforced pile foundation systems for existing and new infrastructure systems. ******The research is anticipated to provide soil and foundation improvement solutions for seismic resistant design and produce design guidelines for retrofitting of existing inadequate foundations. Many infrastructure projects, petrochemical plants, bridges, and renewable energy projects will benefit from the findings of this study. The improved seismic safety and reduced seismic risk in our infrastructure will provide significant social and economic benefits to our community. This research is also expected to benefit the Canadian public and protect the environment as a result of safer and resistant designs.

修订后的国家建筑规范（NBCC 2005）中包含的升级后的地震荷载假定加拿大的地震危险性增加。大多数现有结构，包括主要基础设施（例如核电站、桥梁等），都是在这些新设计准则之前设计和建造的，并且仍然容易受到地震破坏。 此外，在最近的地震中，由于地基过度沉降和/或旋转而导致的建筑物失效，凸显了设计能够承受作用在支撑结构上的地震力的地基的重要性。因此，需要准确表征关键基础设施系统的地震风险，并为新结构和现有结构的抗震地基提供创新的解决方案。 ******此处提出的研究计划旨在开发创新技术，以增强现有基础的横向承载能力，并开发构建抗震基础系统的新技术。本研究的具体目标是： a) 评估软土中地震场地响应和土-结构相互作用 (SSI) 对地基输入运动的影响； b) 探索适合抵抗地震荷载的高效基础系统，以及 c) 开发现有结构基础的创新改造技术。这项研究将采用实验和数值分析的方式进行。将进行振动台试验，以研究地震现场响应和土壤-结构相互作用，以及纤维增强聚合物桩的动力响应。桩荷载测试还将用于检查现有和新基础设施系统的不同加固桩基系统的轴向和横向能力。 ******该研究预计将为抗震设计提供土壤和地基改良解决方案，并为现有不完善的地基改造提供设计指南。许多基础设施项目、石化厂、桥梁和可再生能源项目都将从这项研究的结果中受益。基础设施地震安全性的提高和地震风险的降低将为我们的社区带来显着的社会和经济效益。由于更安全和耐用的设计，这项研究预计还将造福加拿大公众并保护环境。