Development of Link-to-Column Connections for Steel Eccentrically Braced Frames

钢偏心支撑框架连柱连接的开发

• 批准号: 0000031
• 负责人: Michael Engelhardt
• 金额: $ 28.5万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0000031&HistoricalAwards=false
• 关键词: Development; Link; Column; Connections; Steel

0000031EngelhardtThe objective of this research project is to develop and validate safe and economical link-to-column connections for use in steel eccentrically braced frames.The 1994 Northridge and 1995 Kobe earthquake exposed fundamental deficiencies in US design, detailing and welding practices for connections in steel moment frames. Recent research conducted in both countries, however, has lead to major strides in understanding the problems associated with steel moment connections.Eccentrically braced frames (EBFs) provide an alternative to moment frame as a lateral force resisting system in steel buildings. The higher stiffness provided by an EBF could offer important advantages over a moment frame, and the use of EBFs have been constructed since the Northridge Earthquake, many using a configuration where the EBF link is attached to the column. The link-to-column connection in such systems plays a critical role in the seismic performance and safety of the frame.Many of the welding and design conditions responsible for the poor performance of moment frame connections in the Northridge Earthquake are also present in EBF link-to-column connections. At the same time, the force and inelastic deformation demands at link-to-column connections are substantially greater than at moment frame connections. However, virtually no research effort has been directed towards link-to-column connections in EBF to date. Nonetheless, EBF construction is proceeding on he West Coast for major building projects using questionable connection details that have not been verified by testing.A program of combined analytical and large-scale experimental studies will be conducted on link-to-column connections for seismic-resistant steel EBFs. A variety of promising connection details will be investigated and refined using inelastic finite element studies. Connection performance will then be evaluated using full-scale cyclic loading tests, followed by the development of design recommendations.This project will be conducted in close collaboration with investigators at Kyoto University in Japan. The planned collaboration includes coordinated experimental investigations between the US and Japanese sides, participation of a doctoral student from Kyoto University in the US side research, an dynamic testing of specimens fabricated in the US at Kyoto University using loading equipment not available in the US. This project will also include additional collaboration with the National Center for Research in Earthquake Engineering in Taiwan.This project is supported under the 3rd-year competition under NSF 98-36. "US Japan Cooperative Research in Urban Earthquake Disaster Mitigation."

0000031Engelhardt该研究项目的目标是开发和验证在钢制偏心框架中使用的安全，经济的链接到列连接。1994年的Northridge和1995年，Kobe地震裸露的地震裸露的基本缺陷，在美国设计，详细和焊接钢连接实践中，在钢Momm Mist框架中连接。 然而，在两国进行的最新研究已导致在理解与钢矩连接相关的问题方面取得了重大进步。截面的框架（EBF）为矩框架提供了一种替代方案，作为钢制建筑物中横向力的横向力系统。 EBF提供的较高的刚度可以在瞬间框架中提供重要的优势，并且自诺斯里奇地震以来已经建立了EBF的使用，许多人使用EBF链接附在列上的配置。 此类系统中的链接到列连接在框架的地震性能和安全性中起着至关重要的作用。 同时，链接到列连接处的力和非弹性变形需求大大大于时刻框架连接。 但是，迄今为止，几乎没有针对EBF的链接到列连接的研究工作。 尽管如此，EBF的建设正在西海岸进行主要建筑项目，使用可疑的连接细节，这些细节尚未通过测试进行验证。将对抗Seist抗性钢EBF的链接到列连接进行结合的分析和大规模实验研究计划。 使用非弹性有限元研究将研究和完善各种有希望的连接细节。 然后，将使用全尺度的循环加载测试评估连接性能，然后进行设计建议的开发。该项目将与日本京都大学的调查员密切合作进行。 计划合作的合作包括美国和日本各方之间的协调实验研究，美国京都大学的一名博士生的参与，这是对美国在京都大学制造的标本的动态测试，使用美国在京都大学制造的标本。 该项目还将包括与台湾地震工程研究中心的额外合作。在NSF 98-36的第3年竞赛下，该项目得到了支持。 “美国日本城市地震缓解灾难的合作研究。”