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Optimization of design parameters for controlled rocking steel braced dual-frames

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Abstract

A controlled rocking concentrically steel braced frame (CR-CSBF) is introduced as an alternative to conventional methods to prevent major structural damage during large earthquakes. It is equipped with elastic post-tensioned (PT) cables and replaceable devices or fuses to provide overturning resistance and dissipate energy, respectively. Although CR-CSBFs are not officially legalized in globally valid codes for new buildings, it is expected to be presented in them in the near future. The main goal of this study is to determine the optimal design parameters consist of the yield strength and modulus of elasticity of the fuse, the initial force of the PT cable, and the gravity load on the rocking column, considering different heights of the frame, spanning ratios and ground motion types for dual-configuration CR-CSBF. Nonlinear time-history analyses are performed in OpenSees. This study aims to define the optimal input variables as effective design parameters of CR-CSBFs by comparing four seismic responses consisting of story drift, roof displacement, roof acceleration and base shear, and also using the Euclidean metric optimization method. Despite the previous research, this study is innovative and first of its kind. The results demonstrate that the optimal design parameters are variable for various conditions.

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Correspondence to M. Firoozi Nezamabadi.

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Ghasemi, S., Nezamabadi, M.F., Moghadam, A.S. et al. Optimization of design parameters for controlled rocking steel braced dual-frames. Earthq. Eng. Eng. Vib. 21, 1053–1068 (2022). https://doi.org/10.1007/s11803-022-2134-z

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  • DOI: https://doi.org/10.1007/s11803-022-2134-z

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