原文传递
Damping-Ductility Relationships for Flag-Shaped Hysteresis
| 题名： | Damping-Ductility Relationships for Flag-Shaped Hysteresis |
| 正文语种： | eng |
| 作者： | Chan, Nicholas;Hashemi, Ashkan;Zarnani, Pouyan;Quenneville, Pierre |
| 作者单位： | Univ Auckland Dept Civil & Environm Engn Private Bag 92019 Auckland 1142 New Zealand;Univ Auckland Dept Civil & Environm Engn Private Bag 92019 Auckland 1142 New Zealand;Auckland Univ Technol Sch Engn Comp & Math Sci Dept Built Environm Engn Struct Engn Private Bag 92006 Auckland 1142 New Zealand;Univ Auckland Dept Civil & Environm Engn Timber Design Private Bag 92019 Auckland 1142 New Zealand |
| 关键词： | Flag-shape;Damping-ductility;Equivalent viscous damping;Direct displacement-based design (DDBD) |
| 摘要： | Damping-ductility relationships, as applied in direct displacement-based design (DDBD), are products of equivalent linearization techniques used to estimate the nonlinear response of structures. Currently, suitable relationships are lacking for an increasingly wide range of flag-shaped hysteresis that is possible in practice. This paper seeks to fill that gap. Two commonly used numerical procedures are shown to be equivalent in terms of the equivalent viscous damping ratio (EVDR) produced. From approximately 1 million damping-ductility datapoints, an expression for the EVDR is proposed for flag-shapes defined by four parameters: the fundamental period, loading-to-initial stiffness ratio, unloading-to-loading stiffness ratio, and ductility. Compared to Jacobsen's curves, the EVDRs obtained are more sensitive to the first two parameters, and this is reflected in the proposed expression. As Jacobsen's EVDR assumes resonant conditions, the period-dependency is ignored and potentially underestimates the EVDRs for short periods (and vice-versa). A DDBD example demonstrates the design of a flag-shaped hysteresis using the proposed expression. The results of this study offer a flexible damping-ductility formula for the displacement-based design of self-centering seismically resilient structures. (C) 2021 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 147 |
| 期： | 7 |
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