Seismic performance of underground structures based on realistic soil and structural model

基于真实土壤和结构模型的地下结构抗震性能

• 批准号: 484228-2015
• 负责人: Kwon, OhSung
• 金额: $ 1.82万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=584186
• 关键词: Seismic; performance; underground; structures; based

The research aims to understand the accuracy and limitations of commonly used numerical modelling methods for seismic soil-structure-interaction (SSI) analysis of underground structures. To accurately simulate the seismic SSI effect on underground structures, it is necessary to model both soil and structures with realistic numerical elements. Especially, if cracks or local failure develops in the underground structure, the current numerical assessment method based on idealized elastic system is not expected to be accurate. In current design and performance assessment practice, the seismic SSI of underground structure is accounted for by using a very simplified approach which is based on sweeping assumptions on linear-elastic soil-structure system. The proposed research aims to investigate the seismic performance of underground structures based on realistic soil and structural model. The main goal is 1) to evaluate the accuracy of the traditional assessment methods in comparison with a numerical model with accurate representation of soil and structure, and 2) to evaluate the influence of nearby structure on the seismic demand on underground structure. The scope of the study is limited to an idealized subway station subjected to ground shaking. The numerical model will be built upon a distributed simulation framework which allows different analytical models to be integrated within one simulation. Taking the advantage of this advanced modelling technique, various factors influencing the seismic performance of the structure will be investigated. Numerical results will be compared with the closed form solutions to further address the limitations of the simplified methods that are being used in practice.

该研究旨在了解地下结构地震土-结构相互作用（SSI）分析常用数值模拟方法的准确性和局限性。为了准确模拟地震 SSI 对地下结构的影响，需要使用真实的数值元素对土壤和结构进行建模。特别是，如果地下结构出现裂缝或局部破坏，当前基于理想化弹性系统的数值评估方法预计不会准确。在当前的设计和性能评估实践中，地下结构的地震SSI是通过使用基于线弹性土结构系统的全面假设的非常简化的方法来考虑的。本研究旨在基于现实的土壤和结构模型研究地下结构的抗震性能。主要目标是 1) 与精确表示土壤和结构的数值模型相比，评估传统评估方法的准确性；2) 评估附近结构对地下结构抗震需求的影响。研究范围是 仅限于遭受地面震动的理想化地铁站。数值模型将建立在分布式仿真框架的基础上，该框架允许将不同的分析模型集成到一个仿真中。利用这种先进的建模技术，将研究影响结构抗震性能的各种因素。数值结果将与封闭式解决方案进行比较，以进一步解决实践中使用的简化方法的局限性。