The literature related to earthquakes and fibre reinforced polymer (FRP) retrofitting can be divided into two main categories: (1) the applications of FRP to retrofit structures subjected to single traditional earthquakes and (2) the effects of mainshock-aftershock sequences on original structures (without FRP retrofitting). Research on using FRP to mitigate the risk of pulse-type mainshock-aftershock sequences for reinforced concrete (RC) structures located in near-fault regions is hardly found in the literature and is thus the aim of this study. To achieve this aim, a four-storey RC frame, near-fault mainshocks, and seismic sequences were selected. The frame was retrofitted using FRP wraps at plastic hinge locations. Nonlinear time history and damage analyses of the original and FRP-retrofitted frames subjected to these near-fault mainshocks and seismic sequences were conducted. The results showed that aftershocks significantly increase the damage indices of the frames, shifting the damage state of the original frame from severe damage to collapse and the damage state of the FRP-retrofitted frame from light damage to moderate damage. FRP retrofitting successfully reduced the risk of seismic sequences by reducing the damage two levels, shifting the damage state of the original frame from collapse to moderate damage.

中文翻译：

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FRP复合材料可缓解有/无余震的近断层区域RC结构的地震风险

与地震和纤维增强聚合物（FRP）改造相关的文献可分为两大类：（1）FRP在遭受单一传统地震的结构改造中的应用；（2）主震-余震序列对原始结构的影响（不进行玻璃钢翻新）。文献中很少发现使用FRP来减轻位于临近断层区域的钢筋混凝土（RC）结构的脉冲型主震-余震序列风险的研究，因此，本研究的目的是。为了达到这个目的，选择了四层RC框架，近断层主震和地震序列。框架在塑料铰链位置使用FRP包裹进行了翻新。对遭受这些近断层主震和地震序列的原始框架和FRP改装框架进行了非线性时程和损伤分析。结果表明，余震显着增加了框架的损坏指数，使原始框架的损坏状态从严重损坏变为崩溃，而FRP改装框架的损坏状态从轻度损坏变为中度损坏。FRP改造通过将损坏程度降低了两个级别，从而将原始框架的损坏状态从崩溃状态转变为中等程度的损坏，从而成功降低了地震序列的风险。将原始车架的损坏状态从严重损坏转变为倒塌，将FRP改装车架的损坏状态从轻微损坏转变为中等损坏。FRP改造通过将损坏程度降低了两个级别，从而将原始框架的损坏状态从崩溃状态转变为中等程度的损坏，从而成功降低了地震序列的风险。将原始车架的损坏状态从严重损坏转变为倒塌，将FRP改装车架的损坏状态从轻微损坏转变为中等损坏。FRP改造通过将损坏程度降低了两个级别，从而将原始框架的损坏状态从崩溃状态转变为中等程度的损坏，从而成功降低了地震序列的风险。