Self-Centering Truss Moment Frames with Resilient Earthquake Performance

一种创新的新型自定心桁架抗矩框架（SC-TMRF）的设计使建筑框架更具抗震能力，减少相关损害。SC-TMRF由一个桁架和底部弦上的同心管组件组成，该组件与后张紧链一起产生恢复力。传统的抗震系统利用结构构件和连接处的非弹性来分散地震能量，保护建筑物免于倒塌。然而，分布在整个建筑物中的结构损伤和相关的永久残余漂移会使传统结构在大地震后的修复在经济上不合理。最近开发的减轻残余漂移的地震系统面临着困难或复杂的现场施工、高昂的成本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这些问题。此外，带有切口的钢板留下了蝴蝶形的连接，作为结构保险丝，消散地震能量，并且可以在必要时随时更换。该研究项目将通过组件测试、大规模系统实验、计算模拟和创建一套经过验证的设计指南来开发SC-TMRF概念，这些设计指南将允许SC-TMRF概念在实践中应用。SC-TMRF在创新配置中使用常见材料。初步设计和分析表明，SC-TMRF几乎消除了永久性漂移，集中了结构保险丝的结构损坏，在剧烈地震后可以很容易地更换，可以使用传统的现场施工方法进行车间制造，并且使用与传统抗矩框架大致相同的钢材量。由于SC-TMRF是一种自定心抗震系统，有望与传统系统竞争，因此SC-TMRF是一种变革性的新技术，有可能通过具有竞争力的建筑系统，在大多数地震后可能不需要进行结构修复，从而显著减少地震造成的经济损失。

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.