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首页> 外文期刊>Journal of Composites for Construction >Time-Dependent Behavior of RC Beams Retrofitted with CFRP Straps
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Time-Dependent Behavior of RC Beams Retrofitted with CFRP Straps

机译：CFRP皮带加固的RC梁的时变行为

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摘要

A retrofitting technique that uses prestressed unbonded carbon-fiber-reinforced polymer (CFRP) straps to provide additional shear capacity has previously been shown to be successful under short-term static loading conditions. The current study explores the longer-term behavior of this retrofitting technique through two experiments (a sustained load and a cyclic load experiment) and the development of a model based on the modified compression field theory. The experiments indicated that the strain in the CFRP straps changes with time due to changes in the load sharing with the concrete (caused by creep) and the steel stirrups (caused by yield of these elements). The predictive model was initially validated against static experimental results before being applied to the longer-term experiments. The model predicts the trends in behavior well although it is conservative in its estimates of strap strain. The model was then used to determine the influence of stirrup yielding, the load level before and after retrofitting, and the duration of loading on the CFRP strap strains. The initial results suggest that the largest increases in long-term strap strain will occur when the straps are installed early in the structure's service life although further experimental validation is required.
机译：以前已经证明了一种使用预应力未粘结碳纤维增强聚合物（CFRP）皮带提供额外剪切能力的翻新技术在短期静态载荷条件下是成功的。当前的研究通过两个实验（持续载荷和循环载荷实验）以及基于改进的压缩场理论的模型开发来探索这种改型技术的长期性能。实验表明，由于与混凝土（由蠕变引起）和钢箍筋（由这些元素的屈服引起）的载荷分担的变化，CFRP带中的应变随时间变化。将该预测模型首先针对静态实验结果进行验证，然后再应用于长期实验。该模型可以很好地预测行为趋势，尽管它对皮带应变的估计很保守。然后，使用该模型确定箍筋屈服，改造前后的载荷水平以及载荷对CFRP皮带应变的影响。初步结果表明，尽管需要进一步的实验验证，但在结构使用寿命中尽早安装皮带时，长期皮带应变会出现最大的增加。

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