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Estimations of peak floor accelerations in multi-story self-centering concentrically braced frames
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DOI：10.1007/s10518-026-02618-2.png)
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Abstract
En 中文
Self-centering concentrically braced frames (CBFs) belong to seismic resilient CBFs, owing to their excellent capacity of returning to original deformations after strong earthquakes. In the past decades, the community mainly assessed the peak interstory drift (PID), whereas peak floor acceleration (PFA) was rarely evaluated. In fact, PFAs are closely relevant to the seismic damage of nonstructural components. Although current building standards and peer studies provide a variety of estimation approaches for PFAs, noticeable deficiencies have been observed in both the magnitudes and distribution patterns of these PFAs. Moreover, self-centering structures have a flag-shaped hysteresis, which significantly differ from that of conventional structures. This implies that if the estimation approaches developed for conventional structures are directly applied to self-centering structures, estimation errors might be observed. Hence, by taking into account the amplification factor (i.e., PFA/peak ground acceleration), modal shapes, building nonlinearity, dynamic characteristics of flag-shaped hysteresis and spectral value of ground motion suite, an estimation approach is developed for self-centering CBFs. For demonstration purposes, 16 multi-story self-centering CBFs, corresponding to 4 different story numbers and 4 combinations of hysteretic parameters, are designed to meet a prescribed PID of 1.5% at the design basis earthquakes. According to the comparisons with the results from nonlinear time history analysis, this paper indicates that the proposed approach offers better predictions than current building codes when the structure undergoes significant inelastic state.
Keywords:
Peak floor acceleration
Self-centering
Concentrically braced frame
Analytical estimations
Nonstructural components
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