CAREER: Understanding and Quantifying System-level Seismic Performance for the Design of Reinforced Concrete Structures with Highly Ductile Concrete Materials

该学院早期职业发展奖将支持对使用高性能纤维增强水泥复合材料(HPFRCC)的高延性混凝土材料的钢筋混凝土结构系统的抗震性能和设计的研究。工程师们在提高混凝土材料的力学性能和抗裂性方面取得了快速的进步。概念验证研究表明，HPFRCC极大地改善了单个建筑构件的地震反应。为了促进变革性变化和自然灾害结构设计科学的进步，该项目将重点了解如何将HPFRCC设计用于整个建筑系统，以提高抗震性能。通过对结构系统如何使用HPFRCC进行新的理解，工程师将能够设计出更具弹性的结构，从而提高公众的安全、繁荣和福利。该项目将整合物理实验、计算建模和风险评估，以创造评估和设计钢筋混凝土结构的新方法。将制定关于新型建筑材料应用的课程。外展活动将促进不同社会经济背景的女中学生对STEM的兴趣，并让新泽西州纽瓦克的高中生研究与使用新基础设施材料有关的成本效益情景。该奖项将为国家科学基金会(NSF)在国家减少地震灾害计划(NEHRP)中的作用做出贡献。该项目的目标是了解和量化使用高延性混凝土材料的结构系统的抗震性能。这项研究计划将使人们对使用HPFRCC的建筑设计有一个新的理解，并量化它们对性能、生命安全和生命周期成本的影响。为了实现这些成果，这项研究整合了以下目标：(1)通过一系列有针对性的物理试验和详细的计算模拟，量化高性能碾压混凝土构件在轴向加载和弯曲联合作用下的塑性铰响应；(2)创建计算高效的模型，以考虑高性能碾压混凝土构件的独特响应和失效特征，用于系统级抗震分析和设计；(3)制定抗震设计标准、进行风险评估以及分析高性能碾压混凝土系统的成本效益情景；以及(4)整合教育和推广计划，为不同年龄、性别和社会经济背景的学生创造研究和学习机会。该项目将推动高韧性混凝土在自然灾害应用中的科学研究，并为在结构系统中使用新型建筑材料方面的研究、教育和推广方面的领导职业生涯奠定基础。实验结果将通过国家科学基金会支持的自然灾害工程研究基础设施数据仓库(https://www.DesignSafe-ci.org)，)获得，模型将与国家科学基金会计算建模和仿真中心的资源整合。该奖项反映了国家科学基金会的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This Faculty Early Career Development (CAREER) award will support research on the seismic behavior and design of reinforced concrete structural systems using highly ductile concrete materials known as high-performance fiber-reinforced cementitious composites (HPFRCCs). Engineers have made rapid advances in the development of concrete materials with enhanced mechanical properties and cracking resistance. Proof-of-concept studies have shown that HPFRCCs drastically improve the seismic response of individual building components. In order to promote transformational change and progress the science of structural design for natural hazards, this project will focus on understanding how HPFRCCs can be engineered for the use in entire building systems to improve seismic performance. By creating a new understanding of how structural systems behave with HPFRCCs, engineers will be able to design more resilient structures that enhance the public’s safety, prosperity, and welfare. The project will integrate physical experimentation, computational modeling, and risk assessment to create new methods to evaluate and design reinforced concrete structures. Curricula will be developed on the applications of novel construction materials. Outreach activities will promote interest in STEM among female middle school students across socioeconomic backgrounds and engage high school students within Newark, New Jersey to study cost-benefit scenarios related to the use of new infrastructure materials. This award will contribute to the National Science Foundation (NSF) role in the National Earthquake Hazards Reduction Program (NEHRP).The goal of this project is to understand and quantify seismic performance of structural systems using highly ductile concrete materials. The research program will lead to a new understanding of designing buildings with HPFRCCs, and quantify their impact on performance, life safety, and life-cycle costs. In order to achieve these outcomes, the research integrates the following objectives: (1) quantify the plastic hinge response of HPFRCC components under the combined effects of axial loading and bending through a targeted set of physical experiments and detailed computational simulations; (2) create computationally efficient models that account for the unique response and failure characteristics of HPFRCC components for use in system-level seismic analysis and design; (3) develop seismic design criteria, perform risk assessment, and analyze cost-benefit scenarios for HPFRCC systems; and (4) integrate educational and outreach programs to create research and learning opportunities for students across age, gender, and socioeconomic backgrounds. The project will advance the science of highly ductile concretes in natural hazard applications and provide the foundation for a career in leadership in research, education, and outreach in the use of novel construction materials in structural systems. Experimental results will be accessible through the NSF-supported Natural Hazards Engineering Research Infrastructure (NHERI) Data Depot (https://www.DesignSafe-ci.org), and models will be integrated with resources from the NHERI Computational Modeling and Simulation Center.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.