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Abstract:
Self-centering structures have become the focus of current research in earthquake engineering due to their excellent re-centering capability. The re-centering capability primarily influences the residual displacement of structures that is an essential index for assessing the performance of post-earthquake functional and withstand subsequent seismic events of structures. The main purpose of this paper is to investigate the re-centering capability of partially self-centering structures with flag-shaped hysteretic behavior subjected to near-fault pulsed ground motion. To this end, the current provisions on residual displacement of structures were first introduced. Then two self-centering energy dissipation braces (SCEBs) with fully re-centering capability and partially centering capability are developed, and their hysteretic behavior are investigated by quasi-static cyclic loading tests. To capture the flag-shaped hysteretic behavior of such self-centering structures, a mathematical restoring force model based on the Bouc-Wen model is developed. It is found that the self-centering capacity of a partially self-centering structure is inversely related to the energy dissipation capacity, resulting in a reciprocal effect on the maximum and residual deformations of the structure under earthquakes. The influence of the critical parameters (including the energy dissipation ratio (beta), the post-yield stiffness ratio(alpha) and pulse period (Tp)) on the re-centering capability of the model is further investigated by using mathematical and statistical methods. Based on these results, the design recommended values of beta for models with different alpha are given, furthermore, a simplified calculation formula for residual displacement of partially self-centering structures is established based on mathematical statistics.
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Source :
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
ISSN: 0267-7261
Year: 2024
Volume: 186
4 . 0 0 0
JCR@2022
Cited Count:
SCOPUS Cited Count: 1
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 10
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