The cable at the anchorage end is in a bending–tension condition in service due to the variable loads. A new composite anchorage system was proposed to study the flexural–tensile behaviour of the anchorage system with CFRP tendon. Four groups of single-tendon composite anchorage and three groups of five-tendon composite anchorage with bend restrictor were tested. Besides, one group of five-tendon composite anchorage without bend restrictor was tested as a control group. The effects of the bending angle, inner cone angle of the steel barrel and pre-tension force on the flexural–tensile behaviour of the anchorage system were investigated. The internal force state of the tendon inducing different failure modes was analysed. A finite element method was used to analyse the failure mechanism of the anchorage system under the bending–tension condition. Moreover, the flexural–tensile behaviours of the anchorage systems with different elastic moduli of the bonding medium were compared. Results showed that the efficiency coefficients of the composite anchorage with multi-tendon exceeded 0.9 when the end bending angle was less than 4.2°. The setting of the bending restrictor improves the flexural–tensile bearing capacity of the anchorage system and increases the maximum allowable bending angle. A larger bending angle will lead to a faster increase in the transverse shear stress at the loading end. Furthermore, increasing the pre-tension force can prompt the cooperation ability of the tendons and reduce the ultimate slips, thus improving the ultimate load-bearing capacity of the anchorage. The increase in the elastic modulus remarkably reduces the slip of the tendon, but increases the shear stress at the loading end under the bending–tension condition.

中文翻译：

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CFRP筋复合锚固系统弯拉性能研究

锚固端的缆索在使用中由于载荷变化而处于弯拉状态。提出了一种新型复合材料锚固系统来研究CFRP筋锚固系统的弯拉性能。对四组单筋复合锚具和三组带有弯曲限制器的五筋复合锚具进行了试验。此外，还对一组不带弯曲限制器的五筋复合材料锚具进行了试验作为对照组。研究了弯曲角度、钢筒内锥角和预拉力对锚固系统弯拉性能的影响。分析了引起不同失效模式的肌腱内力状态。采用有限元方法分析了弯拉工况下锚固系统的破坏机理。此外，还比较了具有不同粘结介质弹性模量的锚固系统的弯曲-拉伸行为。结果表明，当端部弯曲角度小于4.2°时，多筋复合材料锚具的效率系数超过0.9。弯曲限制器的设置提高了锚固系统的弯拉承载能力，增大了最大允许弯曲角度。弯曲角度越大，加载端横向剪应力增加越快。此外，增加预拉力可以促进筋的配合能力，减少极限滑移，从而提高锚具的极限承载能力。弹性模量的增加显着减少了筋的滑移，但增加了弯拉条件下加载端的剪应力。