NEESR: Seismic Response of Shallow Underground Structures in Dense Urban Environments

用于公共交通的浅层地下结构是可持续城市的关键组成部分。在人口密集的城市环境中，地下结构通常建在高层建筑附近。虽然这些建筑物有可能改变其附近的地面运动，并向邻近的地下结构传递巨大的力量，但这些力量的影响仍然不确定。本项目将采用离心试验和数值模拟相结合的方法，研究中高层建筑附近的临时和永久性切盖箱形结构的地震反应。加州大学戴维斯分校的NEES离心机设备将用于这些测试。试验数据将用于两个目的：第一，了解地震土-结构-地下结构-相互作用（SSUSI）；第二，校准和改进数值模型。离心机试验的非线性数值模拟将有助于评估和改进现有数值工具在捕获SSUSI和关键加载机制方面的能力。将使用校准模型进行参数化研究，以提出设计建议。该项目的数据将存档，并通过NEES项目仓库/数据存储库向公众提供。这一努力将为工程师提供校准良好的预测工具，以更可靠地表征地震期间土壤、基础、结构和浅层地下结构之间的相互作用。更好地了解这些相互作用也将促进对一系列地下设施和关键生命线（包括隧道、管道和公用事业）的研究和实践。因此，该项目的研究结果是朝着提高我们城市中心对地震的恢复能力迈出的重要一步。这项研究项目是科罗拉多大学博尔德分校、伊利诺伊大学厄巴纳-香槟分校和ARUP旧金山分校的合作成果。这项研究也将受益于NEES和日本E-Defense研究人员之间的合作。在其推广计划中，该项目将与美国国家科学基金会资助的科罗拉多研究生教育和教授联盟（AGEP）以及科罗拉多大学博尔德分校的领导力和多样性扩大机会中心（BOLD）合作，从工程领域代表性不足的群体中招募优秀学生。该奖项是国家减少地震灾害计划（NEHRP）的一部分。

Shallow underground structures used for public transportation are a key component of sustainable cities. In dense urban environments, underground structures are often built near tall buildings. Although such buildings have the potential to alter ground motions in their vicinity and transmit significant forces to adjacent underground structures, the impact of these forces remains uncertain. This project will study the seismic response of temporary and permanent cut-and-cover box structures near mid- to high-rise buildings using a combination of centrifuge testing and numerical simulations. The NEES centrifuge facility at UC Davis will be used for these tests. The data from the tests will serve two purposes: first, to understand seismic soil-structure-underground structure-interaction (SSUSI), and second, to calibrate and improve numerical models. Nonlinear numerical simulations of centrifuge tests will help assess and improve the capabilities of existing numerical tools in capturing SSUSI and key loading mechanisms. Parametric studies using calibrated models will be conducted to make design recommendations. Data from this project will be archived and made available to the public through the NEES Project Warehouse/data repository. This endeavor will provide engineers with well-calibrated predictive tools to more reliably characterize interactions between soil, foundation, structure, and shallow underground structure during earthquakes. A better understanding of these interactions will also advance research and practice for a range of underground facilities and critical lifelines including tunnels, pipelines, and utilities. As such, the findings of this project are an important step toward improving the resilience of our urban centers to earthquakes. This research project is a collaborative effort between the University of Colorado at Boulder, the University of Illinois at Urbana-Champaign, and ARUP San Francisco. This study will also benefit from collaboration between researchers at NEES and Japan's E-Defense. In its outreach program, the project will recruit outstanding students from underrepresented groups in engineering in collaboration with NSF funded Colorado Alliance for Graduate Education and the Professoriate (AGEP) and the Center for Broadening Opportunity through Leadership and Diversity (BOLD) at CU Boulder. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).