Self-Centering Truss Moment Frames with Resilient Earthquake Performance

设计了一种新颖的自定心桁架抗弯框架(SC-TMRF)，以提高建筑框架的抗震能力，并减少相关的破坏。SC-TMRF由一个桁架组成，在下弦处有一组同心管，与后张法绞线一起产生恢复力。传统的抗震体系利用结构构件和节点的非弹性来消散地震能量，防止建筑物倒塌。然而，分布在整个建筑中的结构损伤和相关的永久残余漂移可能会使传统结构在大地震后在财务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存在现场施工困难或复杂、成本溢价高以及与变形兼容性相关的挑战。SC-TMRF的独特配置解决了其中许多问题。此外，留有蝶形连接件的钢板充当结构保险丝，消散地震能量，如果需要，可以很容易地更换。该研究项目将通过部件测试、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，从而使SC-TMRF概念能够在实践中应用。SC-TMRF以创新的配置使用常见材料。初步设计和分析表明，SC-TMRF几乎消除了永久性漂移，将结构损伤集中在结构保险丝中，在严重地震后可以很容易地更换，可以通过传统的现场施工方法进行手工制造，并且使用与传统抗弯框架大致相同的钢材。由于SC-TMRF是一种自中心抗震系统，预计将与传统系统竞争，因此SC-TMRF是一项变革性的新技术，有可能通过具有竞争力的建筑系统显著减少地震造成的经济损失，该系统可能在大多数地震后不需要结构修复。

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.