NEESR-SG Innovative Applications of Damage Tolerant Fiber-Reinforced Cementitious Materials for New Earthquake-Resistant Structural Systems and Retrofit of Existing Structures

NEESR-SG 耐损伤纤维增强水泥材料在新型抗震结构系统和现有结构改造中的创新应用

• 批准号: 0530383
• 负责人: James Wight
• 金额: --
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-15 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0530383&HistoricalAwards=false
• 关键词: NEESR; SG; Innovative; Applications; Damage

Abstract for: NEESR-SG Innovative Applications of Damage Tolerant Fiber-Reinforced Cementitious Materials for New Earthquake-Resistant Structural Systems and Retrofit of Existing Structures, CMS proposal 0530383PI: James K. Wight, University of Michigan Ann Arbor It is proposed to use NEES testing facilities and associated simulation capabilities to develop new coupled wall systems and retrofit schemes for framed construction through the use of high-performance fiber reinforced cement composites (HPFRCC). This research was conceived from the idea that the next generation of reinforced concrete (RC) structures should utilize ductile cementitious materials in critical regions, rather than extensive reinforcement detailing to provide shear resistance and concrete confinement. A high-performance fiber reinforced cementitious composite (HPFRCC) that is ductile in tension, does not spall in compression, behaves like a confined concrete, and is capable of providing confinement to normal reinforcement, will be used. In addition to enhancing confinement and flexural behavior in plastic hinging regions, HPFRCC materials are capable of providing ductility and energy dissipation capabilities to shear critical members that are normally a difficult design issue for RC structures. The use of HPFRCC materials for such members will lead to less complicated reinforcement details, will be easier to construct, and will provide a high degree of damage tolerance, leading to superior seismic performance and reduced post-earthquake repair costs. The research will be conducted by a diverse and multidisciplinary team from three major universities, Michigan, Stanford and Illinois, with expertise in structural engineering, computational simulation, materials engineering, information technology and cyberinfrastructure deployment. Cooperative assistance with computation and simulation requirements has been offered by the MGRID and Sakai research groups at the University of Michigan. Intellectual Merit: HPFRCC materials will be used as a tool to develop new coupling beam designs for RC structural wall systems and infill panels for seismic retrofitting of existing steel or RC framed structures. Shear wall systems are very popular for medium-rise structures in zones of high seismicity and the development of a coupling beam that is easier to construct than current diagonal reinforcing schemes, yet still can sustain large shear stress and displacement demands with good stiffness retention, will be a major original contribution. Also, there is a significant need for an efficient method to upgrade existing critical facilities that require structural and/or non-structural system protection. The development of ductile precast HPFRCC infill panels will result in an effective and practical method for enhancing the strength, stiffness and energy dissipation capabilities of deficient steel and RC frame structures, while allowing them to remain in full service during rehabilitation activities. Structural and materials engineering experts will collaborate on developing HPFRCC mixture designs that can be handled in a normal batch plant, trucked to the site and pumped to the casting location. Analytical models that accurately reproduce the behavior of HPFRCC under various stress states will be developed for simulation of structural behavior, for the control of the proposed pseudo-dynamic experiments, as well as for use by the earthquake engineering community in general. The combination of the computing power of the NEESgrid and MGRID, integrated with various structural simulation packages, offers a unique opportunity that will be pursued for the incorporation of highly detailed models in pseudo-dynamic testing of wall and frame systems.Broader impacts: 1) One of the most significant broader impacts of this research will be the wider acceptance and use of highly damage-tolerant fiber reinforced concretes for enhancing structural performance during earthquakes. 2) The results of this research will provide the NEES community with the capability of using more sophisticated simulation models for hybrid testing of structural systems. 3) A multi-use environment based on the Sakai software platform (used in NEESgrid and course management systems across the country) will be further developed, where students and researchers will be able to do coursework and participate in experiments without negotiating separate tools, authenticating to different systems, or learning new interfaces. 4) A participatory experience for pre-engineering students at institutions affiliated with the Midwest Instructional Technology Center (MITC) will be created. Through the involvement of a diverse set of graduate and undergraduate researchers and outreach to students at small colleges, particularly women and under-represented minority students, a new generation of studentswill be introduced to the use of high-performance structural materials, behavior of structures during earthquakes, and sophisticated structural analysis and simulation techniques.

摘要：NEESR-SG关于损伤容限纤维增强水泥材料在新的抗震结构体系和现有结构改造中的创新应用，CMS提案0530383PI：密歇根大学安娜堡分校的詹姆斯·K·鬼魂建议利用NEES测试设施和相关的模拟能力，通过使用高性能纤维增强水泥复合材料(HPFRCC)来开发新的连体墙系统和框架结构的加固方案。这项研究的想法是，下一代钢筋混凝土(RC)结构应该在关键区域使用延性胶凝材料，而不是广泛的钢筋细节来提供抗剪和混凝土约束。将使用一种高性能纤维增强水泥复合材料(HPFRCC)，这种复合材料在拉伸时具有延展性，在压缩时不会剥落，其性能类似于约束混凝土，并且能够对正常钢筋提供约束。除了增强塑性铰接区域的约束和弯曲性能外，HPFRCC材料还能够提供延性和耗能能力来剪切关键构件，这通常是RC结构设计的难点。HPFRCC材料用于此类构件将使加固细节不那么复杂，更容易施工，并将提供高度的损伤容限，从而带来更好的抗震性能和降低震后维修成本。这项研究将由一个来自密歇根、斯坦福和伊利诺伊三所主要大学的多元化和多学科团队进行，他们拥有结构工程、计算模拟、材料工程、信息技术和网络基础设施部署方面的专业知识。密歇根大学的MGRID和Sakai研究小组已经提供了具有计算和模拟要求的合作援助。智能优点：HPFRCC材料将被用作为RC结构墙系统和填充板开发新的连梁设计的工具，用于现有钢结构或RC框架结构的抗震加固。剪力墙体系在高地震区的中高层结构中非常流行，发展一种比现有的对角加固方案更容易施工，但仍能承受较大剪应力和位移要求且保持良好刚度的连梁，将是一项重大的原创性贡献。此外，迫切需要一种有效的方法来升级需要结构和/或非结构系统保护的现有关键设施。延性预制HPFRCC填充板的开发将为缺陷钢结构和RC框架结构提供一种有效和实用的方法来提高强度、刚度和耗能能力，同时允许它们在修复期间保持全面使用。结构和材料工程专家将合作开发HPFRCC混合料设计，这些混合料可以在普通的配料厂处理，用卡车运到现场，然后泵送到铸造地点。将开发能够准确再现HPFRCC在不同应力状态下的行为的分析模型，用于结构行为的模拟、拟动力试验的控制以及地震工程界的一般使用。NEESgrid和MGRID的计算能力与各种结构模拟程序的集成，为将高度详细的模型纳入墙和框架系统的拟动力测试提供了一个独特的机会。广泛的影响：1)这项研究最重要的更广泛的影响之一将是更广泛地接受和使用高损伤容限纤维混凝土来提高结构在地震中的性能。2)这项研究的结果将为NEES社区提供使用更复杂的模拟模型进行结构系统混合测试的能力。3)进一步开发基于Sakai软件平台的多用途环境(用于全国各地的NEES网格和课程管理系统)，学生和研究人员将能够做课程作业和参与实验，而不需要协商单独的工具，不需要对不同的系统进行认证，也不需要学习新的界面。4)将为中西部教育技术中心(MITC)附属机构的工程预科学生创造参与式体验。通过一系列不同的研究生和本科生研究人员的参与，以及与小型学院的学生，特别是女性和代表性不足的少数族裔学生的接触，将向新一代学生介绍高性能结构材料的使用、结构在地震中的行为以及复杂的结构分析和模拟技术。