Seismic performance assessment of eccentrically braced frames with cast steel link elements through hybrid simulations

通过混合模拟评估带有铸钢连接元件的偏心支撑框架的抗震性能

• 批准号: 560261-2020
• 负责人: Kwon, OhSung
• 金额: $ 2.19万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=705918
• 关键词: Seismic; performance; assessment; eccentrically; braced

The proposed project aims to develop an off-the-shelf high-performance cast steel replaceable link to be used in the design and construction of eccentrically braced frames (EBFs). As part of such developments, the project will involve quasi-static cyclic tests, pseudo-dynamic hybrid simulations, and advanced numerical simulations. Steel EBFs provide a great alternative to the commonly used lateral load resisting systems (LLRS) in steel structures such as concentrically braced frames and moment-resisting frames. Through inelastic action of the link and use of eccentric braces, they provide an ideal balance between lateral stiffness, energy dissipation, and drift control, while allowing for architectural openings in the braced bays. Current design guidelines and construction practices of EBFs, however, are not without limitations. The link beam is often a segment of the main floor beam. This makes the design of EBFs an iterative process and leads to construction difficulties and repair challenges. The development of cast steel replaceable links is a vision that the PI shares with Cast Connex, which will address the design challenges with EBF. In the research project, two sizes of the proposed product with different capacities will be fabricated and tested. Hybrid simulations on cast steel replaceable links will be carried out to perform a performance assessment of the structural system. Besides, material coupon tests will be performed to calibrate the numerical models and characterize the proposed cast steel links' low-cycle fatigue life models, followed by the development of design guidelines. The proposed research is a necessary step towards finalizing the development of the proposed system. It will enable the research team and the industry partner to offer the engineering community a wide range of products suitable for different structures and buildings of different height.

拟议项目旨在开发一种现成的高性能铸钢可更换连杆，用于偏心支撑框架（EBF）的设计和施工。作为此类开发的一部分，该项目将涉及准静态循环测试、伪动态混合模拟和高级数值模拟。钢 EBF 为钢结构中常用的横向载荷抵抗系统 (LLRS)（例如同心支撑框架和抗力矩框架）提供了很好的替代方案。通过连杆的非弹性作用和偏心支撑的使用，它们在横向刚度、能量耗散和漂移控制之间提供了理想的平衡，同时允许在支撑隔间中留出建筑开口。然而，当前 EBF 的设计指南和施工实践并非没有限制。连接梁通常是主地板梁的一部分。这使得 EBF 的设计成为一个迭代过程，并导致施工困难和维修挑战。开发铸钢可更换链节是 PI 与 Cast Connex 的共同愿景，这将解决 EBF 的设计挑战。 在该研究项目中，将制造和测试具有不同容量的两种尺寸的拟议产品。将对铸钢可更换连杆进行混合模拟，以对结构系统进行性能评估。此外，还将进行材料试样测试来校准数值模型并表征所提出的铸钢连杆的低循环疲劳寿命模型，然后制定设计指南。拟议的研究是最终确定拟议系统开发的必要步骤。它将使研究团队和行业合作伙伴能够为工程界提供适合不同结构和不同高度建筑物的广泛产品。