Seismic Evaluation and Upgrading of Existing Steel Concentric Braced Structures

现有钢同心支撑结构的抗震评估与改造

• 批准号: 9416184
• 负责人: Subhash Goel
• 金额: $ 6.99万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416184&HistoricalAwards=false
• 关键词: Seismic; Evaluation; Upgrading; Existing; Steel

9416184 Goel The primary objective of this research project is to develop methods for evaluation and upgrading of existing "non- ductile" (ordinary) concentric braced frame structures of steel for survival during future earthquakes. Whereas, widespread connection failures in steel moment frames due to the Northridge earthquake were quite unexpected, it is also generally recognized that concentric braced frames (CBF) are among the most efficient and popular structural systems in steel for lateral load resistance. There exists a large inventory of these structures which are potentially hazardous. A significant number of such structures suffered widespread damage during the Northridge earthquake and required extensive repair and upgrading work. Current or past design practice and codes did not focus on providing ductility in these structures previously studied. The Northridge experience has emphasized the need for developing methods for evaluating and upgrading existing CBF in order to ensure satisfactory performance during future more severe probable earthquakes. Two theme structures are selected for the study. The four story building in North Hollywood which suffered the most dramatic failures and which represents the typical CBF structures designed by modern codes and practice has been chosen for detailed investigation including correlation of the results with observed damage. The second part of this project is devoted to the development of practical and effective upgrading schemes to mitigate future earthquake hazard. This is a Northridge earthquake project. ***

9416184 Goel本研究项目的主要目的是开发评估和升级现有的“非延性”（普通）同心支撑钢框架结构的方法，使其在未来地震中能够生存。然而，由于北岭地震，钢弯矩框架中广泛的连接失效是相当出乎意料的，人们也普遍认为同心支撑框架（CBF）是最有效和最受欢迎的抗侧载钢结构体系之一。存在大量具有潜在危险的这些结构。许多这样的结构在北岭地震中遭受了广泛的破坏，需要大量的修复和升级工作。当前或过去的设计实践和规范并没有把重点放在提供这些结构的延展性上。Northridge的经验强调了开发评估和升级现有CBF的方法的必要性，以确保在未来更严重的可能地震中具有令人满意的性能。本文选取了两个主题结构进行研究。北好莱坞的四层建筑遭受了最严重的破坏，代表了现代规范和实践设计的典型CBF结构，已经被选中进行详细的调查，包括结果与观察到的损害的相关性。该项目的第二部分致力于开发实用有效的升级方案，以减轻未来的地震危害。这是北岭地震项目。＊＊＊