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Fatigue Performance Of Tensile Steel Members Strengthened With Cfrp Plates

机译：Cfrp钢板增强抗拉钢构件的疲劳性能

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摘要

In this paper the fatigue behaviour of steel structures retrofitted by using FRP materials is investigated. Preliminary tests were performed at different loading conditions to assess the fatigue performance of unconditioned double sided reinforcement specimens. The stiffness degradation of the reinforced member due to progressive debonding of the adhesive was selected as an index for a subsequent and progressive global failure. Failure mechanisms were observed to start with initial debonding at the plate end and then failure propagated along the element in the interfaces. Visual inspection of the bonds after failure revealed that the adhesive/metal interface represents the weakest point of the reinforcing system. S-N curves were defined and the fatigue behaviour of the specimens was compared to the fatigue resistance of welded detail categories described in the Eurocode 3. The results showed that fatigue resistance of the bond between the steel plate and the CFRP plate is remarkably superior to that of welded cover plates (Eurocode 3 categories 36~*-56~*).
机译：本文研究了使用FRP材料翻新的钢结构的疲劳行为。在不同的载荷条件下进行了初步测试，以评估无条件的双面增强试样的疲劳性能。选择由于粘合剂的逐渐脱粘而导致的增强构件的刚度降低，作为随后的和逐渐的整体破坏的指标。观察到破坏机制始于板端的初始剥离，然后破坏沿界面中的元素传播。破坏后的目视检查表明，粘合剂/金属界面代表了增强体系的最弱点。定义了SN曲线，并将试样的疲劳性能与Eurocode 3中描述的焊接细部类别的疲劳强度进行了比较。结果表明，钢板与CFRP板之间的结合部的疲劳强度显着优于CFRP板。焊接盖板（欧洲规范3类36〜* -56〜*）。

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