Self-Centering Truss Moment Frames with Resilient Earthquake Performance

具有弹性抗震性能的自定心桁架力矩框架

• 批准号: 1200237
• 负责人: Matthew Eatherton
• 金额: $ 30.57万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-04-01 至 2015-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1200237&HistoricalAwards=false
• 关键词: Self; Centering; Truss; Moment; Frames

An innovative new self-centering truss moment resisting frame (SC-TMRF) is devised to make building frames more resilient to earthquakes and reduce associated damage. The SC-TMRF consists of a truss with an assembly of concentric tubes at the bottom chord that creates restoring force in conjunction with post-tensioning strands. Conventional seismic force resisting systems use inelasticity in structural members and connections to dissipate seismic energy and protect buildings against collapse. However, the structural damage distributed throughout a building and related permanent residual drifts can make a conventional structure financially unreasonable to repair following a large earthquake. Recently developed seismic systems that mitigate residual drifts suffer from difficult or complex field construction, large cost premiums, and challenges associated with deformation compatibility. The unique configuration of the SC-TMRF solves many of these problems. Furthermore, steel plates with cut-outs leaving butterfly shaped links act as structural fuses, dissipate seismic energy, and can be readily replaced if necessary. The research project will develop the SC-TMRF concept through component testing, large-scale system experimentation, computational simulation, and the creation of proven set of design guidelines that will allow the application of the SC-TMRF concept in practice.The SC-TMRF uses common materials in an innovative configuration. Preliminary design and analyses suggest that the SC-TMRF virtually eliminates permanent drifts, concentrates structural damage in structural fuses that can be easily replaced after severe earthquakes, can be shop fabricated allowing conventional field construction methods, and utilizes approximately the same amount of steel as conventional moment resisting frames. Because the SC-TMRF is a self-centering seismic force resisting system that is expected to be competitive with traditional systems, the SC-TMRF is a transformative new technology that has the potential to significantly reduce the economic losses due to earthquakes through a competitive building system that may not require structural repair after most earthquakes.

创新的新自我居中的桁架力矩抗体框架（SC-TMRF）设计为使建筑物框架对地震更具弹性并减少相关的损害。 SC-TMRF由一个桁架组成，该桁架在底部和弦处的同心管组件组成，该桁架与后张紧链结合产生恢复力。传统的地震力抵抗系统在结构成员和连接中使用无弹性来消散地震能量并保护建筑物免受崩溃的影响。 但是，在整个建筑物及相关的永久残留漂移中分布的结构损害可能使常规结构在大地震后经济修复是不合理的。 最近开发的地震系统可以减轻残差漂移，遭受困难或复杂的现场构建，成本庞大的溢价以及与变形兼容性相关的挑战。 SC-TMRF的独特配置解决了许多此类问题。 此外，带有切口的钢板留下蝴蝶形状的连接充当结构保险丝，消散地震能，并在必要时很容易更换。 该研究项目将通过组件测试，大规模系统实验，计算模拟以及创建可靠的设计准则来开发SC-TMRF概念，这些设计指南将允许在实践中应用SC-TMRF概念。SC-TMRF在创新配置中使用常见材料。 初步的设计和分析表明，SC-TMRF实际上消除了永久漂移，在结构融合中浓缩结构损伤，在严重地震后可以轻松地替换，可以在严重的地震后替换，可以造成允许传统的现场施工方法，并使用大约与常规稳定镜架相同的钢。 由于SC-TMRF是一种以自我为中心的抗震力抵抗系统，预计将与传统系统具有竞争力，因此SC-TMRF是一种变革性的新技术，有可能通过大多数地震后可能不需要结构性修复的竞争性建筑系统来大大减少由于地震而导致的经济损失。