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Effects of Aftershocks on the Potential Damage of FRP-Retrofitted Reinforced Concrete Structures
International Journal of Civil Engineering ( IF 1.7 ) Pub Date : 2020-06-18 , DOI: 10.1007/s40999-020-00533-4 Vui Van Cao
International Journal of Civil Engineering ( IF 1.7 ) Pub Date : 2020-06-18 , DOI: 10.1007/s40999-020-00533-4 Vui Van Cao
This study investigates the effects of aftershocks on the potential damage of reinforced concrete (RC) structures retrofitted by fibre-reinforced polymer (FRP). An eight-storey RC frame that was poorly confined due to deficient transverse reinforcement was selected and then retrofitted by FRP wraps to provide external confinement. Inelastic time history and damage analyses of the frame under single earthquakes and mainshock–aftershock sequences were performed. FRP retrofit did not ensure a damage-free structure, and it minimised the damage though. The results indicated different contributions of aftershocks to the damage of the retrofitted frame, and this finding illustrates the limitations of current seismic codes. The damage caused by single earthquakes is proposed to be used as a criterion for dealing with the effects of aftershocks as follows. If the mainshocks cause minor or light damage, the effect of aftershocks is negligible, whereas the effect of aftershocks needs to be considered if the mainshocks cause moderate or severe damage. The outcomes of this study can be used in making decisions about whether the effects of aftershocks should be considered.
中文翻译:
余震对 FRP 加固钢筋混凝土结构潜在损坏的影响
本研究调查了余震对由纤维增强聚合物 (FRP) 改造的钢筋混凝土 (RC) 结构潜在损坏的影响。一个八层高的 RC 框架由于横向钢筋不足而限制性较差,然后通过 FRP 包裹物进行改造以提供外部限制。对框架在单次地震和主震-余震序列下的非弹性时程和损伤分析进行了分析。FRP 改造并不能确保结构无损坏,但它最大限度地减少了损坏。结果表明余震对改造框架损坏的不同贡献,这一发现说明了当前地震规范的局限性。建议将单次地震造成的破坏作为处理余震影响的判据如下。如果主震造成轻微或轻微破坏,余震的影响可以忽略不计,而如果主震造成中度或重度破坏,则需要考虑余震的影响。这项研究的结果可用于决定是否应考虑余震的影响。
更新日期:2020-06-18
中文翻译:
余震对 FRP 加固钢筋混凝土结构潜在损坏的影响
本研究调查了余震对由纤维增强聚合物 (FRP) 改造的钢筋混凝土 (RC) 结构潜在损坏的影响。一个八层高的 RC 框架由于横向钢筋不足而限制性较差,然后通过 FRP 包裹物进行改造以提供外部限制。对框架在单次地震和主震-余震序列下的非弹性时程和损伤分析进行了分析。FRP 改造并不能确保结构无损坏,但它最大限度地减少了损坏。结果表明余震对改造框架损坏的不同贡献,这一发现说明了当前地震规范的局限性。建议将单次地震造成的破坏作为处理余震影响的判据如下。如果主震造成轻微或轻微破坏,余震的影响可以忽略不计,而如果主震造成中度或重度破坏,则需要考虑余震的影响。这项研究的结果可用于决定是否应考虑余震的影响。