CFRP筋复合型锚具的受力性能试验

Mechanical behavior experiment of wedge-bond anchorage for CFRP-tendons

为研究CFRP筋复合型锚具的主要设计参数对锚固性能的影响及锚具内部受力情况,设计了5个复合型锚具的参数静载试验,测量了锚具的极限荷载、锚环-CFRP筋间滑移变形和金属筒测点应变,通过静载试验对比分析了各设计参数对锚固效果的影响,以及金属筒表面应力的分布情况与变化规律.研究结果表明:当金属筒壁厚为2 mm,夹片夹持长度为65 mm,粘结长度为500 mm时,锚具的锚固性能较好;夹片-金属筒间锚固良好,无滑移;金属筒应力分布与变化可反映锚具内部受力情况,测点应力曲线峰值预示该位置附近的胶体与CFRP筋间的粘结破坏.

In order to investigate the influence of main design parameters on anchorage performance and internal stress distribution of wedge-bond anchorage for CFRP tendons,five groups of parameter tests on wedge-bond anchorage were designed.The ultimate load,slip deformation of anchor ring and stress of metal sleeve stations were determined.The influence of design parameters on anchorage performance,the tress distribution and variation of metal sleeve were contrastively investigated through static loading testing.The results show that the anchorage performance with metal sleeve thickness of 2 mm,a wedge length of 65 mm,bond length of 500 mm is optimal.The anchor between wedge and metal sleeve is good without relative displacement.The tress distribution and variation of metal sleeve can reflect the internal stress distribution of anchorage,and the perk of stress curve indicates bonding failure between colloid and CFRP tendon near the observation point.