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Experimental study on fatigue performance of adhesively bonded anchorage system for CFRP tendons

机译：CFRP筋粘结锚固体系疲劳性能的试验研究。

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摘要

This study is concerned with the fatigue performance of adhesively bonded anchorage for carbon fiber reinforced polymer (CFRP) tendons subjected to cyclic loading. Series of monotonous and cyclic experiments under different stress amplitudes and loading frequencies were carried out in order to investigate the mechanical performance of bonded anchorage systems for CFRP tendons and to study the influence of cyclic loading on the anchoring performance. The fatigue damage and the relationships between damage, loading frequency and interfacial temperature rise of anchorage systems were analyzed. The results show that cyclic tension-tension loading is instrumental in enhancing the synergistic interaction between the anchorage components and it also stabilizes the entire anchorage system performance provided that the stress amplitude is kept lower than 10% of the ultimate tensile capacity of the anchorage systems and the maximum stress is less than 50% of the ultimate capacity of the anchorage system. The loading frequency influences significantly the temperature variation in the anchorage system. A high loading frequency may result in a sharp temperature rise at the early-stage and mid-stage of cyclic tension-tension loading, followed by a rather stable late stage. This phenomenon of temperature rise during fatigue tests may indicate the extent of fatigue damage in the anchorage system.
机译：这项研究与碳纤维增强聚合物（CFRP）筋的粘结锚固的疲劳性能有关。为了研究CFRP筋粘结锚固系统的力学性能，研究循环荷载对锚固性能的影响，进行了一系列在不同应力幅值和荷载频率下的单调和循环试验。分析了锚固系统的疲劳损伤以及损伤，载荷频率与界面温升之间的关系。结果表明，周期性的拉-拉荷载作用有助于增强锚固构件之间的协同相互作用，并且在应力幅值保持低于锚固系统极限抗拉能力的10％的条件下，还可稳定整个锚固系统的性能。最大应力小于锚固系统极限承载力的50％。加载频率显着影响锚固系统中的温度变化。较高的加载频率可能会导致循环拉伸-拉伸加载的早期和中期温度急剧升高，随后是相当稳定的后期。在疲劳测试过程中这种温度升高现象可能表明锚固系统中疲劳损坏的程度。

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