Experimental Investigation on Tensile and Torsional Properties of GFRP Bar Anchors
LIU Yihong1, BAI Xiaoyu1,*, SUN Gan1, WANG Zhongsheng2,3, LI Ming4, YAN Nan1
1 School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China 2 Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao 266101, Shandong, China 3 Qingdao Geology and Geotechnical Engineering Co., Ltd., Qingdao 266101, Shandong, China 4 Jiangsu Haichuan New Materials Technology Co., Ltd., Zhenjiang 212416, Jiangsu, China
Abstract: In order to study the mechanical properties of GFRP bars in tension and torsion, and to clarify the influence of ultimate pull-out capacity and ultimate torque on diameter and gauge length, the pull-out and torsion indoor tests of GFRP bars were carried out respectively, In particular, the pull-out tests of GFRP bars with and without hollow core were carried out, and the mechanical indexes such as ultimate pull-out capacity, maximum torque, elastic modulus and shear modulus were obtained respectively. The results show that:(1) in the pull-out test, the ultimate pull-out capacity of GFRP bars is only related to the diameter, and has nothing to do with the length of anchor bars. With the increase of the diameter of GFRP bars, the growth rate of ultimate pull-out capacity is more significant. In the torsional test, the maximum torque of GFRP bars is also only related to the diameter and has nothing to do with the gauge distance, but the maximum rotation angle is related to the gauge distance and is less affected by the change of diameter. (2) Suitably reduction of working section length will not affect the pull-out test results. (3) The elastic modulus of GFRP bars without and with filling is basically the same, which is about 33% lower than that of solid GFRP bars, but the ultimate pull-out capacity of GFRP bars with filling is about 1.53 times of that of GFRP bars without filling. (4) The tensile strength of GFRP bars is greater than that of steel bars, but its shear modulus is smaller. The research results lay a foundation for the popularization and application of GFRP bars in civil engineering.
刘一鸿, 白晓宇, 孙淦, 王忠胜, 李明, 闫楠. GFRP筋锚杆抗拉及抗扭性能试验研究[J]. 材料导报, 2025, 39(16): 24080178-7.
LIU Yihong, BAI Xiaoyu, SUN Gan, WANG Zhongsheng, LI Ming, YAN Nan. Experimental Investigation on Tensile and Torsional Properties of GFRP Bar Anchors. Materials Reports, 2025, 39(16): 24080178-7.
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2025, Vol. 39 
