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Bond Strength of composite CFRP reinforcing bars in timber

机译:木材中复合CFRP钢筋的粘结强度

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摘要

The use of near-surface mounted (NSM) fibre-reinforced polymer (FRP) bars is an interesting method for increasing the shear and flexural strength of existing timber members. This article examines the behaviour of carbon FRP (CFRP) bars in timber under direct pull-out conditions. The objective of this experimental program is to investigate the bond strength between composite bars and timber: bars were epoxied into small notches made into chestnut and fir wood members using a commercially-available epoxy system. Bonded lengths varied from 150 to 300 mm. Failure modes, stress and strain distributions and the bond strength of CFRP bars have been evaluated and discussed. The pull-out capacity in NSM CFRP bars at the onset of debonding increased with bonded length up to a length of 250 mm. While CFRP bar’s pull-out was achieved only for specimens with bonded lengths of 150 and 200 mm, bar tensile failure was mainly recorded for bonded lengths of 250 and 300 mm.
机译:使用近表面安装的(NSM)纤维增强聚合物(FRP)钢筋是增加现有木材构件的剪切强度和抗弯强度的有趣方法。本文研究了在直接拉出条件下木材中碳FRP(CFRP)钢筋的行为。该实验程序的目的是研究复合杆与木材之间的粘结强度:使用市售的环氧体系将杆打磨成板栗和杉木构件制成的小缺口。粘合长度从150到300毫米不等。已经评估和讨论了CFRP筋的破坏模式,应力和应变分布以及粘结强度。脱胶开始时,NSM CFRP钢筋的拉拔能力随粘结长度的增加而增加,直至250 mm。 CFRP钢筋的拔出仅适用于粘结长度为150和200 mm的样品,而钢筋拉伸断裂主要记录于粘结长度为250和300 mm的情况下。

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