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首页> 外文期刊>International journal of steel structures >Experimental Investigation on Fatigue Behavior of Wide-Flange Steel I-Beams Strengthened Using Different CFRP End Cutting Shapes
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Experimental Investigation on Fatigue Behavior of Wide-Flange Steel I-Beams Strengthened Using Different CFRP End Cutting Shapes

机译：不同CFRP端切割宽法兰钢I型梁疲劳行为的实验研究

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摘要

In recent decades, the application of carbon fibre-reinforced polymer (CFRP) composites for strengthening structural elements has become an efficient option to meet the increased cyclic loads, or repair due to fatigue cracking. The premature failure due to end-debonding is a key limitation to achieve high fatigue performance of strengthened steel beams with externally bonded CFRP plates. The objective of this study is to explore the reinforcing techniques using the CFRP in-plane end cutting shapes and the triangular spew fillet of adhesive at the tips of the plate to care for fatigue damaged of wide-flange steel I-beams due to end-debonding. Four in-plane CFRP end cutting shapes were chosen, namely: rectangular, semi-elliptical, semi-circular and trapezoidal. The application of the trapezoidal end shape was found to be the best configuration for delaying the end-debonding failure mode and high fatigue life compared to the other CFRP in-plane end cutting shapes. Applying the triangular spew fillets of adhesive significantly increased the end-debonding and steel beam fracture initiation life of the strengthened beams.
机译：近几十年来，用于加强结构元素的碳纤维增强聚合物（CFRP）复合材料已成为满足循环载荷增加的有效选择，或由于疲劳裂缝而修复。由于终端剥离引起的过早失效是实现具有外部粘合CFRP板的强化钢梁的高疲劳性能的关键限制。本研究的目的是探讨使用CFRP内端切割形状和粘合剂的三角形喷射圆角在板的尖端上进行粘合剂，以注意疲劳损坏宽法兰钢I型梁的疲劳剥夺。选择四个面内CFRP端切割形状，即：矩形，半椭圆形，半圆形和梯形。发现梯形端部形状的应用是与其他CFRP面内切割形状相比延迟结束剥离失效模式和高疲劳寿命的最佳配置。施加三角形粘合剂的粘合剂圆角显着增加了加强梁的最终剥离和钢束骨折启动寿命。

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