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Retrofitting of interior RC beam–column joints using CFRP strengthened SHCC: Cast-in-place solution

机译:使用CFRP加固的SHCC加固内部RC梁柱节点:现浇解决方案

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摘要

The effectiveness of a repair strategy, for damaged RC beam–column joints, that combines strain hardening cementitious composite (SHCC) and laminates of carbon fiber reinforced polymers (CFRP laminates) is assessed in the present work. According to this technique, the existing concrete cover in the joint zone of the frame is replaced by a self-compacting SHCC. This thin layer of SHCC is reinforced with CFRP laminates that are bonded into the saw cut grooves. Two full-scale severely damaged interior RCbeam–column joints were retrofitted using two different configurations of this technique: (i) applying the strengthening system to only the front and rear faces of the specimen; (ii) jacketing all sides of the elements of the specimen with the strengthening system. The effectiveness of these retrofitting configurations is assessed and compared by evaluating experimentally the hysteretic response, the dissipated energy, the degradation of secant stiffness, the displacement ductility and the failure modes of eachrepaired specimen, and also using the values of these indicators obtained in the virgin state of the specimens.This comparison revealed that the adopted retrofitting strategies can restore and even enhance the performance of this type of structural elements, mainly when the solution based on four-sided jacketing is used.
机译:在本工作中,评估了一种结合了应变硬化水泥基复合材料(SHCC)和碳纤维增强聚合物层压板(CFRP层压板)的受损RC梁柱节点修复策略的有效性。根据此技术,框架的接合区域中现有的混凝土覆盖层将由自密实SHCC代替。 SHCC的薄层由粘合到锯切槽中的CFRP层压板加强。使用此技术的两种不同配置,对两个严重损坏的内部RCbeam-立柱内部接头进行了改装:(i)仅对试样的正面和背面应用加强系统; (ii)用加强系统套住试样各要素的所有侧面。通过实验评估滞后响应,耗散的能量,割线刚度的退化,位移延展性和每个修复标本的破坏模式,并使用在原始处获得的这些指标的值,评估并比较了这些改造配置的有效性。这种比较表明,采用的翻新策略可以恢复甚至增强这种结构元件的性能,主要是在使用基于四面护套的解决方案时。

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