砂浆粘结GFRP锚杆试验研究

EXPERIMENTS ON THE BONDING BEHAVIOUR OF GFRP BOLTS WITH MORTAR

通过对直径为 2 5mm的GFRP螺纹杆的材性试验和灌浆锚固下的拉拔力测试试验 ,研究了GFRP锚杆的锚固性能。研究表明 ,GFRP螺纹杆的抗拉能力高于同等直径的钢筋 ,但是 ,并没有充分发挥GFRP材料的潜力。从拉拔力试验看到 ,GFRP材料的荷载 -滑移曲线与螺纹钢相似 ;GFRP螺纹杆能承受的最大拉拔力比同直径螺纹钢要小 30 %左右 ,表明一般的砂浆锚固不能充分发挥GFRP的材料优势。

The anchorage performance of GFRP rock b olt is studied by the material test of GFRP threaded rod with a diameter of 25mm and its pull-out test of grouting anchorage. The study shows that the tensile capacity of GFRP threaded rod is higher than that of a steel bar with same diame ter, yet its potential can not be in full play. It is indicated by the pull-out test that the load-slip curve of GFRP material is also similar to that of a th readed steel, but its maximum pull-out force is about 30% less than the latter, which shows that the superiority of GFRP material can not be in full play by or dinary mortar anchorage.