CAREER: Toward a New Paradigm in Evaluating and Mitigating Urban Liquefaction

职业生涯：迈向评估和缓解城市液化的新范式

• 批准号: 1454431
• 负责人: Shideh Dashti
• 金额: $ 50万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2022-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1454431&HistoricalAwards=false
• 关键词: CAREER; Toward; New; Paradigm; Evaluating

This Faculty Early Career Development (CAREER) grant will create a new approach for evaluating the behavior of clusters of buildings on liquefiable ground during earthquakes, and pave the way toward designing mitigation measures that improve building performance at a system level. Earthquake-induced soil liquefaction can cause substantial damage to urban areas where multiple buildings and infrastructure systems are clustered. Previous studies have shown that buildings located in close proximity to one another can interact during earthquakes affecting ground motions, settlement patterns, and building damage potential. The parameters that control the seismic performance of building clusters are poorly understood. As a result, mitigation measures that are currently designed perform poorly, particularly when the performance of a building is evaluated in the context of its surroundings. This award supports a systematic study of the impact of adjacent buildings on the effectiveness of liquefaction remediation techniques. In doing so, this award contributes to the resilience of cities globally. In its outreach plan, this effort will improve production and dissemination of knowledge on infrastructure performance during urban disasters through a pilot, community reconnaissance platform. In its educational plan, the grant aims to improve retention among engineering students through pedagogical innovations and an international post-disaster reconnaissance program for undergraduate students.This CAREER grant will advance the science and practice of disaster mitigation in urban areas by enhancing the fundamental understanding of how building clusters respond during earthquakes. The primary objectives of this research are to: 1) study the impact of multiple structure-soil-structure-interaction (SSSI) on the seismic performance of buildings on liquefiable soils and on the effectiveness of mitigation techniques; and 2) identify the fundamental predictors of building performance individually and as a cluster. This will be done through a combination of centrifuge experiments and numerical simulations. This study sets the groundwork for the future development of a probabilistic liquefaction mitigation methodology that relies on mechanistically validated models. The development of validated numerical models and knowledge of the key predictors of the performance of building clusters will enable an effective mitigation of the liquefaction hazard at a scale beyond one isolated building. This effort will enable designing future mitigation measures that dissipate seismic energy and deformation simultaneously to improve performance at a system level.

该学院早期职业发展（CAREER）赠款将创建一种新的方法，用于评估地震期间可移动地面上的建筑群的行为，并为设计缓解措施铺平道路，以提高系统级的建筑性能。 地震引起的土壤液化可能对多个建筑物和基础设施系统聚集的城市地区造成重大破坏。 以前的研究表明，建筑物彼此靠近，可以在地震期间相互作用，影响地面运动，沉降模式和建筑物损坏的可能性。 控制建筑群抗震性能的参数知之甚少。 因此，目前设计的缓解措施效果不佳，特别是在根据建筑物周围环境评估建筑物性能时。 该奖项支持系统研究邻近建筑物对液化补救技术有效性的影响。 通过这样做，该奖项有助于全球城市的恢复力。在其推广计划中，这项工作将通过一个试点社区侦察平台，改进关于城市灾害期间基础设施性能的知识的制作和传播。 在其教育计划中，该基金旨在通过教学创新和针对本科生的国际灾后勘察项目，提高工科学生的保留率。该CAREER基金将通过加强对建筑群在地震中如何反应的基本理解，推进城市地区减灾的科学和实践。 本研究的主要目的是：1）研究多重结构-土壤-结构相互作用（SSSI）对可液化土壤上建筑物抗震性能的影响以及缓解技术的有效性; 2）识别建筑物性能的基本预测因子。 这将通过离心实验和数值模拟相结合来完成。 这项研究奠定了基础的概率液化缓解方法，依赖于机械验证模型的未来发展。开发经过验证的数值模型和了解建筑群性能的关键预测因素，将能够有效缓解液化危害，其规模超过一座孤立的建筑。 这一努力将使未来的缓解措施，消散地震能量和变形的同时，以提高系统的性能。