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（CAREER）奖将支持使用高韧性混凝土材料（称为高性能纤维增强水泥基复合材料（HPFRCCs））的钢筋混凝土结构系统的抗震性能和设计研究。工程师们在开发具有增强的机械性能和抗裂性的混凝土材料方面取得了快速进展。概念验证研究表明，HPFRCC大大改善了单个建筑构件的地震响应。为了促进转型变革和自然灾害的结构设计科学的进步，该项目将侧重于了解如何设计HPFRCC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，以创建评估和设计钢筋混凝土结构的新方法。将开发关于新型建筑材料应用的课程。外联活动将促进不同社会经济背景的女中学生对STEM的兴趣，并吸引新泽西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方案。 该奖项将有助于国家科学基金会（NSF）在国家地震灾害减少计划（NEHRP）中的作用。该项目的目标是了解和量化使用高韧性混凝土材料的结构系统的抗震性能。该研究计划将导致对设计具有HPFRCC的建筑物的新理解，并量化其对性能，生命安全和生命周期成本的影响。为了实现上述目标，本文的主要研究内容包括：（1）通过一系列有针对性的物理试验和详细的数值模拟，定量分析了HPFRCC构件在轴压和弯曲联合作用下的塑性铰响应;（2）创建计算效率高的模型，该模型考虑了系统中使用的HPFRCC部件的独特响应和故障特征，水平的抗震分析和设计;（3）制定抗震设计标准，进行风险评估，并分析HPFRCC系统的成本效益方案;（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。该项目将推进高韧性混凝土在自然灾害应用中的科学，并为在结构系统中使用新型建筑材料的研究，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NSF支持的自然灾害工程研究基础设施（NHERI）数据库（https：//www.example.com）访问，模型将与NHERI计算建模和模拟中心的资源集成。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。www.DesignSafe-ci.org

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.