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

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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.