通过自行设计的室内大型构件对拉试验，测定外锚固段变形量(滑移量)及外锚固极限承载力，分析玻璃纤维增强聚合物(GFRP)抗浮锚杆的外锚固性能。研究结果表明：GFRP抗浮锚杆外锚固的破坏形式有2种，一种是锚杆材料强度不足产生劈裂破坏，另一种是GFRP锚杆和混凝土界面相对滑移较大，产生拔出破坏。直径为28 mm的GFRP抗浮锚杆，在标号为C25的商品混凝土的条件下，外锚固长度为840 mm的极限承载力为356 kN，最大滑移量为7.66 mm；外锚固长度为420 mm的极限承载力为215 kN，最大滑移量为4.24 mm；GFRP抗浮锚杆与混凝土之间平均黏结强度随着滑移量的增大而提高，随着外锚固长度的增加而降低；GFRP 抗浮锚杆与混凝土之间的平均黏结强度的增加速率随滑移量的增大而减小。研究结果为GFRP抗浮锚杆的工程应用提供理论依据。%The external anchorage performance of glass fiber reinforced plastics (GFRP) anti-floating anchors with different anchorage length was studied through self-designed pulling test indoor with large structure. The external anchorage deformation (slippage) and the ultimate capacity were also monitored during the test. The results show that there are two failure modes of the GFRP external anchorage. One is the splitting failure with lack of GFRP material strength and the other is pulling out failure due to larger relative slippage between GFRP anchors and concrete. In the condition of C25 commodity concrete, the limit supporting capacity and maximum slippage of GFRP anti-floating anchors with external anchorage length 840 mm and the diameter 28 mm are 356 kN and 7.66 mm respectively. The limit supporting capacity and maximum slippage of GFRP anti-floating anchors with external anchorage length 420 mm and the diameter 28 mm are 215 kN and 4.24 mm respectively. The generalized average bond strength between GFRP anti-floating anchors and concrete enhances with the increase of slippage quantity, and decreases with the increase of external anchorage length. The average bond strength increase rate between GFRP anti-floating anchors and concrete decreases with the increase of slippage quantity. The research results can provide theoretical basis for the project application of GFRP anti-floating anchors.
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