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

这个奖项是一个结果的NSF 09-524计划征求“乔治E。小布朗地震工程模拟网络（NEES）研究（NEESR）”竞赛，包括格鲁吉亚理工学院（牵头机构），霍华德大学（子奖项）和赖斯大学（子奖项）。该项目将使用洛杉矶的加州大学运营的NEES移动的振动台。项目团队将评估一类具有重定中心和/或高阻尼能力的新型创新系统的功效，并开发其设计和实施框架，以改造钢筋混凝土（RC）建筑物，提高抗震性能。我们的目标是通过创新的大规模现场测试来验证RC建筑物的新型改造。五个改造措施将进行调查，包括新的支撑系统，梁柱连接元件，或列包裹。这些系统的共同优点包括易于应用（几乎不需要重型机械），可扩展性和适应性，被动性，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，这些系统旨在提供改进的抗震性能，包括最小的损坏、增强的事后功能和改进的成本效益。在创新系统中使用先进材料将改善钢筋混凝土建筑物的抗震改造，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）首次对创新改造系统进行全面的系统级验证（许多基于形状记忆合金）使用NEES移动的振动器;（2）与经验丰富的设计专业人员合作，基于代码设计改造措施;（3）使用无线传感器的损坏检测方法，该无线传感器投射关于创新改造的状况和系统响应的详细信息;（4）详细的脆弱性分析，或脆弱性模型，对改造和未改造的建筑物进行分析;（5）成本效益和寿命周期成本分析，以便决策者了解最佳的建筑物改造;（6）与加拿大舍布鲁克大学进行缩小规模系统级试验的国际合作，与国立台湾大学和弘益大学（韩国）进行中等规模试验;（7）影响各级的全面外联和教育方案（K-12、大学和工业）;以及（8）与工业领导人举办的以技术转让为重点的讲习班。这项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第一次大规模验证。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降低钢筋混凝土建筑物地震脆弱性的影响。将建立一个框架，范围从智能传感和结构损伤状态估计，脆弱性建模，性能评估和成本效益研究的改造钢筋混凝土建筑。新系统的验证预计将提供一个显着的进步，通过创新的设计，材料的使用和实施，以改变当前的方法进行抗震改造buildings.Broader Impacts的性能（抗震和生命周期）：拟议的研究，教育和推广计划的广泛影响是四重的。首先，新的多尺度测试，加上详细的分析，将提供这种高性能系统的第一个已知的系统级验证。其次，效率，成本效益，并提出改造所造成的最小的干扰，可以导致上级改造方法，广泛应用，以提高全国范围内的建筑性能。第三，与行业合作伙伴的合作以及在真实的结构中进行改造的现场测试将解决实施的现实挑战，并简化向实践的转移。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让。 第四，在解决STEM（科学、技术、工程和数学）竞技场领域学生人数不足问题的同时，完善高中科学和工程课程的多方面教育计划。该项目的数据将通过NEES数据库存档并向公众提供。 该奖项是国家减少地震灾害计划（NEHRP）的一部分。

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).