Abstract
The steel damper column is an energy-dissipating member that is suitable for reinforced concrete (RC) buildings and those used for multistory housing in particular. However, the effectiveness of steel damper columns may be affected by the behavior of surrounding members, and this effect can be severe in the case of seismic sequences. This article investigates the nonlinear response of building models with an RC moment-resisting frame (MRF) with and without steel damper columns under seismic sequences. The applicability of the concept of the momentary energy input to the prediction of the peak response of RC MRFs with damper columns under seismic sequences is also investigated. The main findings of the study are summarized as follows. (1) The peak response of RC MRFs with damper columns subjected to sequential accelerations is similar to the peak response obtained considering only the mainshock, whereas the cumulative strain energy of RC MRFs accumulates more for sequential accelerations. (2) The steel damper column is effective in reducing the peak and cumulative responses of RC MRFs in the case of sequential seismic input. (3) The relation of the hysteretic dissipated energy during a half cycle of the structural response and the peak displacement of the first modal response can be properly evaluated using the simple model proposed in this study.
Highlights
reinforced concrete (RC) moment-resisting frame (MRF) with damper columns subjected to sequential accelerations is similar to the peak response obtained considering only the mainshock, whereas the cumulative strain energy of RC MRFs accumulates more for sequential accelerations
In the prediction of the peak response of the RC MRF with steel damper columns based on the momentary energy input, the relation between the hysteretic dissipated energy during a half cycle of the structural response and the peak displacement must be properly modeled
The peak peak responses responses of of all all models models under under sequential sequential accelerations accelerations studied here are governed by the mainshock
Summary
A popular and classical strategy for improving the damage control ability of the moment-resisting frame (MRF) is the so-called weak-beam strong-column concept. This strategy is widely accepted and is recommended for the seismic design of MRFs. This strategy is widely accepted and is recommended for the seismic design of MRFs When this strategy is adopted, most of the seismic energy is absorbed by plastic hinges set at each beam end. As was the case in the 2016 Kumamoto earthquake, there may be a sequence of large foreshocks and the mainshock or a sequence of the mainshock and large aftershocks In such cases, seismic energy accumulates at the plastic hinges and causes damage. A dual system with sacrificial members that absorb the seismic energy prior to the beams and columns (e.g., in a damage-tolerant structure) [1] is one solution for creating structures with superior seismic performance
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