Abstract
This article proposes an innovative steel modular MRF with knee brace elements for seismic applications called Moment-Resisting Knee Braced Frame (MKF). In this system, conventional MRF beam-to-column connections are replaced with a combination of simple beam-to-column connections, rigid beam-to-beam stub connections and knee brace elements. The proposed system eliminates CJP welds and adopts shop-welded, field-bolted assemblies. Furthermore, the lateral stiffness of the structure is expected to increase as a result of the application of knee elements. A 5-storey office building comprising the proposed system on the exterior walls is selected and studied. The frame is analysed using the Performance Based Plastic Design (PBPD) approach and designed as per the Canadian steel design standard. Nonlinear static and response history analyses are carried out to evaluate the seismic response of the proposed system and examine the validity of the analysis and design approaches. The results reveal that the proposed system offers a reliable seismic performance and can be a viable alternative to conventional MRFs. It is also found that the PBPD approach leads to a realistic representation of structural performance by utilizing the plastic capacity of structural components.
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Mokhtari, M., Imanpour, A. (2022). Evaluation of the Seismic Behaviour of Modular Steel Moment-Resisting Frame Structures with Knee Braces. In: Mazzolani, F.M., Dubina, D., Stratan, A. (eds) Proceedings of the 10th International Conference on Behaviour of Steel Structures in Seismic Areas. STESSA 2022. Lecture Notes in Civil Engineering, vol 262. Springer, Cham. https://doi.org/10.1007/978-3-031-03811-2_52
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