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.

本研究旨在了解地下结构地震土-结构-相互作用（SSI）分析中常用数值模拟方法的准确性和局限性。为了准确地模拟地震SSI对地下结构的影响，需要用真实的数值单元对土体和结构进行模拟。特别是当地下结构出现裂缝或局部破坏时，现有的基于理想弹性系统的数值评估方法不太准确。在目前的设计和性能评估实践中，地下结构的地震SSI计算采用了一种非常简化的方法，即基于对线弹性土-结构体系的广泛假设。本文的研究目的是基于实际土体和结构模型对地下结构的抗震性能进行研究。研究的主要目的是：1)比较传统评估方法与准确表征土壤和结构的数值模型的准确性；2)评估附近结构对地下结构地震需求的影响。研究的范围是