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首页> 外文期刊>Bulletin of earthquake engineering >A low-cycle fatigue approach to predicting shear strength degradation in RC joints subjected to seismic actions
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A low-cycle fatigue approach to predicting shear strength degradation in RC joints subjected to seismic actions

机译：预测抗震动作RC关节剪切强度降解的低循环疲劳方法

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摘要

Reinforced concrete (RC) structures realised in earthquake-prone regions are exposed to seismic shakings that may result in significant damage and even lead them to collapse. As well known, high stress concentration occurs at the end of both beams and columns of RC frames, making those members extremely prone to damage. Moreover, beam-to-column joints are particularly sensitive to brittle failure, especially in the cases of unreinforced and unconfined joints. This paper investigates the cyclic response of RC beam-to-column joints. Specifically, it is intended at demonstrating that the decay in shear strength due to cyclic actions can be interpreted in the light of the well-known low-cycle fatigue approach. To do so, cyclic experimental tests on RC joints reported in the scientific literature are collected and analysed. The obtained results show that the parameters governing the shear strength degradation are clearly influenced by both the layout of the RC joints and their actual design criteria. This finding highlights that low-cycle fatigue curves can be considered for describing the decay in shear strength due to cyclic actions; however, further well-documented experimental results are needed to completely identify the relationship between the relevant properties of the RC joint and the resulting low-cycle fatigue curve.
机译：在地震 - 俯卧区中实现的钢筋混凝土（RC）结构暴露在可能导致显着损害的地震震荡且甚至导致它们崩溃。众所周知，在RC框架的两个光束和柱的末端发生高应力浓度，使得这些构件非常容易损坏。此外，光束到柱接头对脆性破坏特别敏感，特别是在未充成的和非整合的关节的情况下。本文研究了RC光束到柱关节的环状响应。具体地，在证明由于众所周知的低循环疲劳方法的光线可以解释由于循环动作引起的剪切强度的衰减。为此，收集并分析了科学文献中报告的RC关节的循环实验试验。得到的结果表明，控制剪切强度降解的参数明显受RC关节布局的影响及其实际设计标准。该发现突出显示低周期疲劳曲线可以考虑用于描述由于循环动作引起的剪切强度的衰减;然而，需要进一步良好地记录的实验结果来完全识别RC关节的相关性质与所得的低周期疲劳曲线之间的关系。

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