Self-Centering Truss Moment Frames with Resilient Earthquake Performance

设计了一种创新的新型自定心桁架抗弯框架（SC-TMRF），使建筑框架具有更强的抗震能力，并减少相关的破坏。SC-TMRF由一个桁架组成，在底部弦杆处有一组同心管，与后张索股一起产生恢复力。传统的地震力抵抗系统利用结构构件和连接件的非弹性来耗散地震能量并保护建筑物不倒塌。 然而，分布在整个建筑物中的结构损坏和相关的永久残留漂移可以使常规结构在大地震后在经济上不合理地进行修复。 最近开发的减轻残余漂移的地震系统遭受困难或复杂的现场施工、大的成本溢价以及与变形兼容性相关联的挑战。 SC-TMRF的独特配置解决了许多这些问题。 此外，带有蝶形连接件的切口的钢板可用作结构保险丝，消散地震能量，并且在必要时可以容易地更换。 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概念在实践中的应用。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实际上消除了永久性漂移，将结构损坏集中在结构保险丝中，这些保险丝在严重地震后可以很容易地更换，可以在工厂制造，允许传统的现场施工方法，并使用与传统抗弯框架大致相同的钢材量。 由于SC-TMRF是一种自对中抗震系统，预计将与传统系统竞争，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显着减少地震造成的经济损失，在大多数地震后可能不需要结构维修。

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.