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Seismic behavior of RC columns flexurally strengthened with FRP sheets and FRP anchors

机译：FRP板和FRP锚杆抗弯加固RC柱的抗震性能

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Existing reinforced concrete structures are frequently deemed to be prone to severe damage and/or collapse as a result of the loads that the structure is expected to experience if it were to be subjected to large intensity earthquake shaking. Among the different approaches to elevate the seismic capacity of existing reinforced concrete structures is the use of externally bonded fiber reinforced polymer (FRP) systems, which consist of fiber reinforced polymer sheets soaked in epoxy and bonded onto the concrete surface. However, premature debonding often occurs before the ultimate strength of the carbon fiber sheets is reached, compromising the reliability and/or the efficiency of the intervention. One of the methods to ameliorate premature debonding is the use of fiber reinforced polymer anchors to connect the FRP sheets to the concrete structure, ensuring continuity of the load path. Six reinforced concrete columns were designed, built and tested to investigate the seismic behavior of the strengthened columns, with five of the columns strengthened with fiber reinforced polymer sheets and anchors. The main objective of the testing program was to experimentally verify that the moment capacity of the FRP strengthened columns was accurately calculated, when accounting for two possible failure modes (failure of the FRP sheets and failure of the FRP anchors). Additional objectives were to investigate the influence of the tension-compression cyclic loading on the capacity of the anchors, assess the influence on column behavior when using fiber reinforced polymer transverse reinforcement, and to investigate the influence on column response when implementing a bond breaking layer. The material properties and column configuration, the design methodology, the observed behavior, and the difference between the calculated and the experimental behavior are thoroughly discussed. A new tri-linear behavior model is proposed and areas of future interest are identified.
机译：现有的钢筋混凝土结构通常被认为容易遭受严重破坏和/或倒塌，这是由于如果结构要经受大强度的地震摇动，则预期该结构会承受载荷。提高现有钢筋混凝土结构抗震能力的不同方法之一是使用外部粘结的纤维增强聚合物（FRP）系统，该系统由浸泡在环氧树脂中并粘结到混凝土表面的纤维增强聚合物片组成。但是，过早脱胶通常在达到碳纤维片的极限强度之前发生，从而损害了干预的可靠性和/或效率。改善过早脱胶的方法之一是使用纤维增强的聚合物锚将FRP板连接到混凝土结构，以确保载荷路径的连续性。设计，建造和测试了6根钢筋混凝土柱，以研究增强柱的抗震性能，其中5根柱用纤维增强聚合物板和锚栓进行了加固。该测试程序的主要目标是，在考虑两种可能的破坏模式（FRP板的破坏和FRP锚固件的破坏）时，以实验方式验证FRP加固柱的弯矩承载力是正确计算的。其他目标是研究拉伸-压缩循环荷载对锚固能力的影响，评估使用纤维增强聚合物横向增强时对柱性能的影响，以及研究实施粘结破坏层时对柱响应的影响。详细讨论了材料特性和色谱柱配置，设计方法，观察到的行为以及计算出的行为与实验行为之间的差异。提出了一种新的三线性行为模型，并确定了未来感兴趣的领域。

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