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首页> 外文期刊>Bulletin of earthquake engineering >Research on the influencing factors for residual displacements of RC bridge columns subjected to earthquake loading
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Research on the influencing factors for residual displacements of RC bridge columns subjected to earthquake loading

机译：地震作用下钢筋混凝土桥柱残余位移影响因素研究

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摘要

Following the 1995 Kobe earthquake, many RC bridge columns were demolished due to a residual drift ratio of more than 1.75 % even though they did not collapse. The residual drift ratio is a quantitative index for the performance objective of reparability in the bridge seismic design. Numerical models of the columns are built to study the factors that influence the residual displacement of RC bridge columns. In these models, both column bending and bar pulling out deformation are considered using the fiber column-beam element and zero-length section element, respectively. Then, nonlinear time history analyses are performed. The factors that influence column residual displacement, such as the characteristics of ground motion, the structural responses (the maximum lateral drift ratio and the displacement ductility factor), and the structural characteristics (the aspect ratio and the longitudinal reinforcement ratio) are investigated. It is found that the near-fault ground motion induces a larger residual drift ratio than the far-fault ground motion. The residual drift ratio becomes larger due to the increase of the maximum lateral drift ratio, the displacement ductility factor, and the aspect ratio. Further, a larger longitudinal reinforcement ratio can induce a larger residual drift ratio due to the contribution of the bar pulling out deformation.
机译：在1995年的神户地震之后，由于许多钢筋混凝土桥梁柱没有倒塌，但其残余漂移率仍超过1.75％，因此被拆除。残余漂移率是桥梁抗震设计中可修复性性能目标的定量指标。建立了柱的数值模型，以研究影响RC桥柱残余位移的因素。在这些模型中，分别使用纤维柱梁单元和零长度截面单元来考虑柱弯曲和钢筋拔出变形。然后，进行非线性时程分析。研究了影响柱残余位移的因素，例如地震动的特性，结构响应（最大侧向位移比和位移延性因子）以及结构特性（纵横比和纵向加强比）。发现近断层地震动比远断层地震动引起更大的残余漂移率。由于最大横向漂移率，位移延展性因子和纵横比的增加，残余漂移率变大。此外，由于钢筋拉出变形的作用，较大的纵向加强比会引起较大的残余漂移率。

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