Dual System Strongback Designs for Seismic Damage-Resistant Structures

加固体系是一种新的结构体系设计策略，可以缓解地震作用下建筑物结构损伤的集中积累。尽管Strongback系统有望在地震期间提高性能，但由于没有足够的数据来记录和表征它们的行为和功能，StrongBack系统在新的建筑中尚未得到广泛使用。这项研究的目标是调查和量化坚固系统的不同元素和配置如何有助于建筑物对地震破坏的恢复能力，并确定如何最好地将这些特征融入未来的设计中。对Strongback系统、开发的优化设计方法和预测公式的基本了解的加深，将帮助结构工程师设计具有Strongback系统的结构，并鼓励进一步使用这些系统。结果将使建筑能够更好地抵御极端地震事件，增加公众的安全，并为更有效的建筑实践提供基础，从而增加繁荣和减少对环境的影响。此外，通过这个项目，本科生研究助理和一名研究生将参与并培训数值和实验研究方法。这项研究开发的小规模、模块化的实验强健模型将作为研究生课程实践学习活动的基础。项目数据将通过美国国家科学基金会支持的自然灾害工程研究基础设施数据仓库(https://www.DesignSafe-ci.org)，)进行存档和传播，以满足对用于Strongback系统模型验证的高质量系统级数据的需求。该奖项支持国家减少地震灾害计划。这项研究将填补强震抗震系统性能基本知识的空白，并将使考虑和利用这些系统非线性动力响应的复杂性的设计方法成为可能。将产生新的数据，内容涉及结构系统的“弹性”元素所吸引的需求、接近或超过这些元素的强度的后果以及能量耗散阻力的分布。将展示创新设备的潜力，例如那些以惯性为特征的设备，以调整建筑结构的动态行为。在Strongback系统开辟的巨大且未开发的设计空间内进行优化将指导和启发未来对这些系统的研究。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Strongback systems are a new design strategy for structural systems that can mitigate the concentrated accumulation of structural damage in buildings during an earthquake. Despite their promising potential to improve performance during seismic events, strongback systems have not seen widespread use in new construction because insufficient data exist to document and characterize their behavior and functionality. The goal of this research is to investigate and quantify how different elements and configurations of strongback systems contribute to the resilience of buildings to earthquake damage and to determine how best to incorporate those features into future designs. The increased fundamental understanding of strongback systems, the developed optimal design methodology, and predictive equations will help structural engineers to design structures with strongback systems and encourage the further use of these systems. The results will enable the construction of buildings that are better able to withstand extreme seismic events, increase the safety of the public, and provide a basis for more efficient construction practices that will increase prosperity and reduce environmental impact. Additionally, through this project, undergraduate research assistants and a graduate student will be engaged and trained in numerical and experimental research methods. The small-scale, modular experimental strongback model developed as a result of this research will be used as the basis for hands-on learning activities in graduate courses. Project data will be archived and disseminated through the NSF-supported Natural Hazards Engineering Research Infrastructure (NHERI) Data Depot (https://www.DesignSafe-ci.org), filling a need for high-quality system level data for strongback system model validation. This award supports the National Earthquake Hazards Reduction Program. This research will fill gaps in the fundamental knowledge of the performance of strongback seismic force-resisting systems and will enable design methodologies that consider and exploit the complexities of the nonlinear dynamic response of these systems. New data will be generated on the demands that "elastic" elements of structural systems attract, the consequences of approaching or exceeding the strength of such elements, and the distribution of energy dissipating resistance. The potential of innovative devices, such as those that feature inertance, to tune the dynamic behavior of building structures will be demonstrated. Optimization within the large and unexplored design space opened by the strongback system will guide and inspire future studies on these systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.