NEESR-CR - Innovative Seismic Retrofits for Resilient Reinforced Concrete Buildings

NEESR-CR - 弹性钢筋混凝土建筑的创新抗震改造

• 批准号: 1041607
• 负责人: Reginald DesRoches
• 金额: $ 119.71万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2015-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1041607&HistoricalAwards=false
• 关键词: NEESR; CR; Innovative; Seismic; Retrofits

This award is an outcome of the NSF 09-524 program solicitation "George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Research (NEESR)" competition and includes the Georgia Institute of Technology (lead institution), Howard University (subaward), and Rice University (subaward). The project will utilize the NEES mobile shakers operated by the University of California, Los Angeles.The project team will evaluate the efficacy of a new class of innovative systems with recentering and/or high damping capabilities, and develop a framework for their design and implementation to retrofit reinforced concrete (RC) buildings to improve seismic performance. The goal is to validate, via innovative large scale field testing, a new class of retrofits for RC buildings. Five retrofit measures will be investigated, consisting of novel bracing systems, beam-column connection elements, or columns wraps. Common advantageous characteristics of the systems include the ease of application (requiring little-to-no heavy machinery), scalability and adaptability, passive nature, and need for little-to-no maintenance through the life-cycle. Furthermore, these systems aim to provide improved seismic performance in terms of minimal damage, enhanced post-event functionality, and improved cost-benefit compared to traditional retrofit approaches. The use of advanced materials in innovative systems will result in improved seismic retrofits for RC buildings that may find more widespread adoption due to their efficient design, minimal maintenance or disruption for installation, and enhanced cost-effectiveness. The research includes a series of unique multi-scale experiments, coupled with detailed finite element simulations, fragility analyses, and cost-benefit studies. Research, education, and outreach plans include the following key components: (1) first of its kind full-scale system-level validation of innovative retrofit systems (many based on shape memory alloys) using the NEES mobile shakers; (2) code-based designs of retrofit measures, in collaboration with experienced design professionals; (3) damage detection approaches using wireless sensors that project detailed information on the condition of the innovative retrofits, and the system response; (4) detailed fragility analyses, or vulnerability models, of buildings with and without retrofit; (5) cost-benefit and life-cycle cost analyses to inform decision-makers on optimal building retrofits; (6) international cooperation on reduced-scale system-level tests with Sherbrooke University in Canada, and medium-scale testing at National Taiwan University, and Hongik University (Korea); (7) a comprehensive outreach and education program impacting all levels (K-12, college, and industry); and (8) workshops focused on technology transfer with industry leaders.Intellectual Merit: This research provides the first large-scale validation of high performance systems based on a series of multi-scale component and full-scale system-level field tests. Detailed analytical modeling and fragility analyses will be performed to assess the impact of various innovative retrofits on reducing the seismic vulnerability of RC buildings. A framework will be established, ranging from smart sensing and structural damage state estimation, to fragility modeling, performance assessment, and cost-benefit studies of retrofitted RC buildings. The validation of the new systems are expected to provide a marked advance in performance (seismic and life-cycle) through innovative design, material usage, and implementation to transform current approaches for seismic retrofit of buildings.Broader Impacts: The broader impacts of the proposed research, education, and outreach program are four-fold. First, the novel multi-scale testing, coupled with detailed analysis, will provide the first known system-level validation of such high performance systems. Second, the efficiency, cost-effectiveness, and minimal disruption caused by retrofits proposed can result in superior retrofit approaches with broad application to improve building performance nationwide. Third, the collaboration with industry partners and field testing of retrofits in real structures will address realistic challenges of implementation and streamline transfer to practice. A series of workshops will bring together academics, researchers, and industry to advance the transfer of innovative systems for seismic building retrofit. Fourth, a multi-faceted education program addresses the need to improve high school science and engineering curriculum, while addressing the lack of underrepresented students pursuing degrees in the STEM (science, technology, engineering, and mathematics) arena.Data from this project will be archived and made available to the public through the NEES data repository. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).

该奖项是NSF 09-524项目招标“小乔治·e·布朗地震工程模拟（NEES）研究网络（NEESR）”竞赛的结果，包括佐治亚理工学院（牵头机构）、霍华德大学（次级奖项）和莱斯大学（次级奖项）。该项目将利用加州大学洛杉矶分校（University of California, Los Angeles）运营的NEES移动振动台。项目团队将评估具有重入和/或高阻尼能力的新型创新系统的有效性，并为其设计和实施制定框架，以改造钢筋混凝土（RC）建筑以提高抗震性能。目标是通过创新的大规模现场测试，验证钢筋混凝土建筑的新型改造。五种改造措施将被调查，包括新的支撑系统，梁柱连接元件，或柱包裹。这些系统的共同优势特征包括易于应用（几乎不需要重型机械）、可伸缩性和适应性、被动性质以及在整个生命周期中几乎不需要维护。此外，与传统的改造方法相比，这些系统的目标是在最小的损坏方面提供更好的抗震性能，增强事后功能，提高成本效益。在创新系统中使用先进材料将改善钢筋混凝土建筑的抗震改造，由于其高效的设计，最小的维护或安装中断，以及提高的成本效益，可能会得到更广泛的采用。该研究包括一系列独特的多尺度实验，以及详细的有限元模拟、脆弱性分析和成本效益研究。研究、教育和推广计划包括以下关键组成部分：(1)首次使用NEES移动激振器对创新改造系统（许多基于形状记忆合金）进行全面系统级验证；(2)与经验丰富的专业设计人员合作，进行基于规范的改造措施设计；(3)使用无线传感器的损伤检测方法，该方法可以提供有关创新改造条件和系统响应的详细信息；(4)对经过和未经过改造的建筑物进行详细的脆弱性分析或脆弱性模型；(5)成本效益和全生命周期成本分析，为决策者提供最优的建筑改造方案；(6)与加拿大舍布鲁克大学开展小规模系统级测试国际合作，与台湾大学、韩国弘益大学开展中等规模测试国际合作；(7)影响各级（K-12、大学和工业）的全面推广和教育计划；(8)与行业领袖共同举办技术转让研讨会。智力优势：本研究提供了基于一系列多尺度组件和全尺寸系统级现场测试的高性能系统的首次大规模验证。将进行详细的分析建模和脆弱性分析，以评估各种创新改造对减少钢筋混凝土建筑的地震脆弱性的影响。将建立一个框架，范围从智能传感和结构损坏状态估计，到脆弱性建模，性能评估和改造RC建筑的成本效益研究。新系统的验证有望通过创新设计、材料使用和实施来改变当前建筑物抗震改造的方法，从而在性能（抗震和生命周期）方面取得显著进步。更广泛的影响：拟议的研究、教育和推广计划的更广泛影响是四倍的。首先，新颖的多尺度测试，加上详细的分析，将为这种高性能系统提供第一个已知的系统级验证。其次，效率，成本效益，和最小的干扰所提出的改造可以产生卓越的改造方法，广泛应用于提高全国建筑性能。第三，与行业合作伙伴的合作以及在实际结构中进行改造的现场测试将解决实施中的现实挑战，并简化转化为实践的过程。一系列研讨会将汇集学者、研究人员和工业界，以推进抗震建筑改造创新系统的转移。第四，多方面的教育计划解决了改善高中科学和工程课程的需要，同时解决了缺乏代表性不足的学生在STEM（科学、技术、工程和数学）领域攻读学位的问题。该项目的数据将存档，并通过NEES数据储存库向公众提供。该奖项是国家减少地震灾害计划（NEHRP）的一部分。