基于裸光纤光栅传感技术GFRP抗浮锚杆荷载传递机制的原位试验研究

发布时间：2018-06-17 00:30

本文选题：GFRP锚杆 + 裸光纤光栅　；参考：《工程力学》2015年08期

【摘要】：基于3根全螺纹GFRP抗浮锚杆现场拉拔破坏性试验,成功地将植入式裸光纤光栅传感技术应用于抗浮锚杆拉拔试验中,研究了全长黏结GFRP抗浮锚杆在各级荷载作用下的承载特性、荷载传递特征及破坏机制。研究表明:植入式裸光纤光栅传感技术有其独特的优越性,不会对锚杆自身造成损伤;GFRP抗浮锚杆破坏以杆体基体材料剪切破坏为主,锚固长度为5.0 m,φ28 mm锚杆极限抗拔承载力为400 k N,能够满足工程需求;锚杆的轴向应力主要集中在距孔口约3.0 m的区域,且随着锚固深度的增加迅速衰减;剪应力峰值出现在距离孔口以下约0.8 m的位置,随着荷载的增加,剪应力曲线的峰值逐渐增大并向深部移动。在此基础上,进一步分析论证了GFRP抗浮锚杆的破坏机制,为GFRP抗浮锚杆的工程应用提供了理论依据。
[Abstract]:Based on three full-threaded GFRP anti-floatation anchor rods in situ pull-out destructive test, the implanted bare fiber grating sensing technology was successfully applied to the anti-floating anchor rod drawing test, and the bearing characteristics of the full-length bonded GFRP anti-floating anchor under various loads were studied. Load transfer characteristics and failure mechanism. The results show that the implanted bare fiber grating sensing technology has its unique advantages, and the failure of GFRP anti-floating anchor is mainly caused by shearing failure of the base material of the bolt body, which will not cause damage to the anchor rod itself. The anchoring length is 5.0 m, and the ultimate pull-out bearing capacity of 蠁 28mm anchor rod is 400kN, which can meet the engineering requirements, and the axial stress of the bolt is mainly concentrated in the area about 3.0 m from the hole opening, and decreases rapidly with the increase of anchoring depth. The peak value of shear stress appears about 0.8 m below the orifice. With the increase of load, the peak value of shear stress curve increases gradually and moves to the deep. On this basis, the failure mechanism of GFRP anti-floating anchor rod is further analyzed and demonstrated, which provides a theoretical basis for the engineering application of GFRP anti-floating anchor rod.
【作者单位】：青岛理工大学土木工程学院;蓝色经济区工程建设与安全协同创新中心(青岛理工大学);潍坊学院建筑工程学院;
【基金】：国家自然科学基金项目(51278261) 教育部高等学校博士学科点专项科研基金项目(20133721110003)
【分类号】：TU476

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