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Seismic strengthening of an under-designed RC structure with FRP

机译：FRP对设计欠佳的RC结构进行抗震加固

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摘要

The opportunities provided by the use of fiber-reinforced polymer (FRP) for the seismic retrofit of existing reinforced concrete (RC) structures were assessed on a full-scale three-story framed structure. The structure, designed only for gravity loads, was subjected to a bi-directional pseudo-dynamic (PsD) test at peak ground acceleration (PGA) equal to 0.20g at the ELSA Laboratory of the Joint Research Centre.The seismic deficiencies exhibited by the structure after the test were confirmed by post-test assessment of structural seismic capacity performed by nonlinear static pushover analysis implemented on the lumped plasticity model of the structure. In order to allow the structure to withstand 0.30g PGA seismic actions, a retrofit using glass fiber-reinforced polymer (GFRP) laminates was designed. The retrofit design was targeted to achieve a more ductile and energy dissipating global performance of the structure by increasing the ductility of columns and preventing brittle failure modes. Design assumptions and criteria along with nonlinear static pushover analysis to assess the overall capacity of the FRP-retrofitted structure are presented and discussed. After the retrofit execution, a new series of PsD tests at both 0.20g and 0.30g PGA level were carried out. Theoretical predictions are compared with the main experimental outcomes to assess the effectiveness of the proposed retrofit technique and validate the adopted design procedures.
机译：在完整的三层框架结构上评估了使用纤维增强聚合物（FRP）进行现有钢筋混凝土（RC）结构抗震改造的机会。该结构仅用于重力载荷，在联合研究中心的ELSA实验室接受了峰值加速度（PGA）等于0.20g的双向伪动态（PsD）测试。试验后的结构通过对结构的集总可塑性模型进行非线性静力推覆分析的结构后抗震能力评估来确定。为了使该结构能够承受0.30g PGA地震作用，设计了一种使用玻璃纤维增​​强聚合物（GFRP）层压板的改型。改造设计的目标是通过增加柱子的延展性和防止脆性破坏模式来实现结构的更延展性和耗能的整体性能。提出并讨论了设计假设和准则，以及用于评估FRP翻新结构总容量的非线性静态推覆分析。改造执行后，在0.20g和0.30g PGA水平下进行了一系列新的PsD测试。将理论预测与主要实验结果进行比较，以评估所提出的改造技术的有效性并验证采用的设计程序。

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