NEESR-SG: Self-Centering Damage-Free Seismic-Resistant Steel Frame Systems

NEESR-SG：自定心无损伤抗震钢框架系统

• 批准号: 0420974
• 负责人: Richard Sause
• 金额: $ 200万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-10-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0420974&HistoricalAwards=false
• 关键词: NEESR; SG; Self; Centering; Damage

PROJECT SUMMARYThe proposed project will investigate a family of innovative self-centering (SC) steel frame systems withthe potential to withstand the currently accepted design basis earthquake (DBE) for buildings without damage.The project goals are: to develop fundamental knowledge of the seismic behavior of SC steel frame systems; toconduct integrated design, analysis, and experimental research on SC steel frame systems, using the enablingfacilities of the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES); to developperformance-based, reliability-based seismic design procedures and criteria for SC steel frame systems; and to educate students and practitioners with fundamental and practical knowledge about SC steel frame systems.Unlike conventional earthquake-resistant steel frame systems that are designed to develop significantinelastic deformations under the DBE, resulting in significant damage as well as residual drift, the innovativeSC steel frame systems developed by the project have the potential to avoid structural damage under the DBEas a result of several features: the lateral force-drift behavior softens without inelastic deformation of thestructural members, and, therefore, without the resulting structural damage and residual drift; the softeningbehavior is created by gap opening at selected post-tensioned connections (e.g., a separation at the beamcolumn interfaces of the frame); the ductility capacity of the lateral force-drift behavior can be quite large and is not controlled by material ductility capacity; and energy dissipation under seismic loading is not from damage to main structural members, but from energy dissipation elements that are specified in the design process and can be replaced if damaged.The project scope includes nine research tasks and a number of educational, outreach, and disseminationactivities focused on SC steel frame systems. The research team will develop reliability-based seismic designprocedures, system concepts and details, and energy dissipation elements for SC steel frame systems; willdevelop sensor networks to monitor and assess SC steel frame systems; and will design prototype buildingsusing SC steel frame systems, perform nonlinear analyses of these prototype buildings, and conduct large-scale laboratory simulations on specimens derived from the prototype buildings. The project requires the use of the Real-Time Multidirectional Testing Facility for Seismic Performance Simulation of Large-Scale Structural Systems (RTMD) NEES equipment site at Lehigh for large-scale earthquake simulations to achieve its goals.The hybrid (pseudo-dynamic) testing method will be utilized, and when needed, the real-time hybrid testing method and real-time capabilities of the RTMD will be used as well.The project team is multi-organizational, involving Lehigh, Princeton, and Purdue Universities, multidisciplinary and diverse. The team includes international participation from the National Center for Research on Earthquake Engineering (NCREE) in Taiwan, and will be advised by a board of individuals fromengineering firms well known in the US and international earthquake and structural engineering communities. Intellectual Merit.. Prior research on SC steel systems has demonstrated their potential, however,comprehensive knowledge of their seismic behavior and performance is lacking. Prior NSF-funded researchon SC precast concrete systems has produced knowledge that is enabling these innovative systems to moveinto practice; similar knowledge is needed for SC steel systems. The proposed project will provide the neededfundamental knowledge on the behavior and performance of SC steel systems, as well as practical knowledgeneeded for implementation into design, fabrication, and construction practice. The main innovations of SCsteel systems are: initial stiffness similar to conventional systems, with softening under earthquake loading, but without main structural member damage, residual drift, and the related post-earthquake repair costs; and energy dissipation by design, not by main structural member damage. In addition, innovative project features include the development of reliability-based, comprehensive design procedures and criteria for SC steel systems in parallel with the development of the systems themselves, and the development of sensor networks for damage monitoring and assessment to avoid costly post-earthquake inspection processes.Broader Impacts.. The new SC steel frame systems have the potential to withstand the DBE without damage,as well as to be economical in initial cost. Thus, by advancing knowledge about SC steel frame systems, theproject is anticipated to have significant societal benefits by reducing the often-enormous post-earthquakedamage costs of conventional earthquake-resistant systems. In addition, the project will impact the earthquake engineering workforce by educating graduate and undergraduate students participating in the proposed project, students enrolled in the course developed by the project, and students reached by the project web site. Practitioners will be educated through the dissemination plan and project web site.

项目概述本项目将研究一系列创新的自定心（SC）钢框架系统，这些系统具有承受当前公认的建筑设计基准地震（DBE）而不损坏的潜力。利用乔治E.小布朗地震工程模拟网络（NEES）;为SC钢框架系统开发基于性能、基于可靠性的抗震设计程序和标准;并向学生和从业者传授SC钢框架系统的基础和实践知识。与传统抗震钢框架系统不同，传统抗震钢框架系统的设计会在DBE下产生显著的弹性变形，导致显著的损坏和残余漂移，由该项目开发的创新SC钢框架系统具有避免DBE下的结构损坏的潜力，这是由于以下几个特征：横向力-漂移行为软化而没有结构构件的非弹性变形，因此，没有导致的结构损坏和残余漂移;软化行为是由选定的后张连接处的间隙开口产生的（例如，在框架的梁柱界面处的分离）;侧向力-位移行为的延性能力可以相当大并且不受材料延性能力的控制;地震荷载下的能量耗散不是来自于主要结构构件的损伤，而是从设计过程中指定的消能元件，如果损坏可以更换。项目范围包括九项研究任务和一些的教育，推广和传播活动集中在SC钢框架系统。研究小组将开发基于可靠性的抗震设计程序，系统概念和细节，以及SC钢框架系统的耗能元件;将开发传感器网络来监测和评估SC钢框架系统;并将设计原型建筑使用SC钢框架系统，对这些原型建筑进行非线性分析，并对原型建筑的样本进行大规模实验室模拟。该项目需要利用位于利哈伊的大型结构系统地震性能模拟实时多方向试验设施NEES设备场地进行大规模地震模拟，以实现其目标。（拟动态）试验方法，必要时，实时混合测试方法和RTMD的实时能力也将被使用。项目团队是多组织的，包括利哈伊大学、普林斯顿大学和普渡大学，多学科和多样化。该团队包括来自台湾国家地震工程研究中心（NCREE）的国际参与者，并将由来自美国和国际地震和结构工程界知名工程公司的个人组成的董事会提供咨询。知识产权SC钢结构系统的研究已经证明了其潜力，然而，缺乏对其抗震性能和性能的全面了解。之前NSF资助的SC预制混凝土系统研究已经产生了使这些创新系统能够付诸实践的知识; SC钢系统也需要类似的知识。该项目将为SC钢系统的行为和性能提供所需的基础知识，并为设计、制造和施工实践提供实用知识。SCsteel系统的主要创新在于：初始刚度与传统系统相似，在地震荷载下软化，但没有主要结构构件的损坏，残余位移和相关的震后维修费用;通过设计而不是通过主要结构构件的损坏来耗能。此外，创新项目的特点包括为SC钢系统开发基于可靠性的综合设计程序和标准，同时开发系统本身，以及开发用于损害监测和评估的传感器网络，以避免昂贵的震后检查过程。新的SC钢框架系统具有承受DBE而不损坏的潜力，并且在初始成本方面具有经济性。因此，通过提高对SC钢框架系统的认识，该项目预计将通过减少传统抗震系统通常巨大的震后破坏成本来产生显着的社会效益。此外，该项目将通过教育参与拟议项目的研究生和本科生、参加该项目开发的课程的学生以及通过该项目网站接触的学生来影响地震工程人员。将通过传播计划和项目网站对从业人员进行教育。