Abstract
In this study an energy-based method for the design of passive Energy Dissipative Bracing (EDB) systems is presented, as a retrofit technique for existing reinforced concrete buildings. A comprehensive literature overview concerning the design of hysteretic bracing systems based on various design philosophies, such as force-, displacement- or energy-based, is provided. The proposed method is suitable for low to medium height buildings which exhibit shear-type behaviour. The procedure is based on the principle of optimum strength distribution that enables the distribution of damage/energy and avoids its concentration at a single storey. Initially the design strength of EDB system at the base is determined and subsequently the strength of storeys above is evaluated through a shear coefficient obtained from numerical analysis. The efficiency of the proposed method is verified by performing non-linear static and non-linear dynamic analysis of three reinforced concrete frames designed with obsolete codes of pre-1980s. Furthermore, the results of the proposed method are compared with two other procedures selected in the literature. The validity of each procedure is discussed based on the results of non-linear static and non-linear dynamic analyses.
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This work has been carried out under a research grant provided by the Italian Civil Protection—ReLUIS Project 2021, which is largely appreciated
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by RRR, VB and GM. The first draft of the manuscript was written by RRR and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Rahmat Rabi, R., Bianco, V. & Monti, G. Energy-based method to design hysteretic bracings for the seismic rehabilitation of low-to-medium rise RC frames. Bull Earthquake Eng 20, 587–605 (2022). https://doi.org/10.1007/s10518-021-01249-z
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DOI: https://doi.org/10.1007/s10518-021-01249-z