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首页> 外文期刊>Structure and Infrastructure Engineering >Collapse safety margin-oriented seismic retrofit strategy for corroded reinforced concrete frames using fibre reinforced plastics
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Collapse safety margin-oriented seismic retrofit strategy for corroded reinforced concrete frames using fibre reinforced plastics

机译：用纤维增强塑料折叠安全保证金导向腐蚀混凝土框架的地震改造策略

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摘要

Considering residual service life, this paper presents a collapse safety margin-oriented seismic retrofit strategy for corroded reinforced concrete (RC) frames using fibre reinforced plastics (FRP). With the assumed uniform corrosion model, corrosion-induced initial damage combined with subsequent earthquake-induced damage is identified by the multi-mode-based global damage model developed previously. The collapse-level earthquake intensity determined by incremental dynamic analyses (IDA) with the damage model and the maximum considered earthquake (MCE)-level intensity considering residual service life are combined to generate the time-variant collapse safety margin assessment of corroded RC structures. Based on this assessment, the collapse safety margin-oriented FRP seismic retrofit strategy is proposed and demonstrated on a 4-storey frame. The damage model originally developed for earthquake scenarios has also exhibited its rationality for characterising corrosion-induced initial damage and its influence on coupled damage development with subsequent earthquake excitation. Seismic retrofitting with FRP composites should consider the effects of the corrosion development stage, target collapse safety margin and residual service life. FRP retrofits can cause decreases in the MCE-level collapse probability and increases in the collapse resistance of corroded RC structures. Retrofitting carried out at different times achieves different efficiencies and different time-variant collapse safety margins within the residual service life.
机译：考虑到剩余使用寿命，本文介绍了使用纤维增强塑料（FRP）的腐蚀钢筋混凝土（RC）框架的坍塌安全缘地震改装策略。利用假设的均匀腐蚀模型，通过先前开发的多模式的全局损伤模型识别了腐蚀引起的初始损伤。考虑剩余使用寿命的损伤模型（IDA）的增量动态分析（IDA）与损伤模型（MCE） - 抗震性能的最大强度决定的崩溃级地震强度被组合以产生腐蚀式RC结构的时变坍塌安全保证金评估。基于该评估，提出了4层楼的框架上提出了折叠安全保证金的FRP地震改造策略。最初为地震场景开发的损害模型也表现出具有表征腐蚀引起的初始损害的合理性及其对随后的地震励磁耦合损伤发展的影响。使用FRP复合材料的地震改装应考虑腐蚀开发阶段的影响，目标崩溃安全保证金和剩余使用寿命。 FRP改造可能导致MCE级崩塌概率下降，并增加腐蚀式RC结构的塌陷电阻。在不同时间进行的改造在残留使用寿命中实现了不同的效率和不同的时变塌陷安全利润。

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