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| BOND DAMAGE OF PRESTRESSED SAND-COATED GLASS FIBRE REINFORCED POLYMER ANCHOR |
| LI Guowei1，2，YU Liang3，WU Yucai4，HE Guanjun3，DAI Jian3，5，LIU Long6，Andrew Cudzo Amenuvor3 |
(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Highway and Railway Research Institute，Hohai University，Nanjing，Jiangsu 210098，China，3. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；4. Guangdong Zhaoyang Expressway Co.，Ltd.，Guangzhou，Guangdong 510850，China；5. Jiangsu Sanshui Environment Construction Group Co.，Ltd.，Jurong，Jiangsu 212400，China；
6. Department of Engineering Mechanics，Hohai University，Nanjing，Jiangsu 210098，China) |
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Abstract The durability problem of anchor rods used to reinforce slopes can be solved by substituting fiber reinforced polymer(FRP) bars for steel bars. The FRP bars have small elastic moduli，and therefore should be prestressed in order to limit the deformation of the reinforced slope during its service stage. This paper described the grating sensing technology to be applied to monitor the bond behavior of sand-coated GFRP anchor rod under cyclic prestressing. The results showed that prestressing of the sand-coated GFRP anchor rod led to the damage of rod-mortar interface bonding of the anchor. The effect of repeated load on the bonding was negligible and the effect of the surcharge load was significant. The damage to the bonding of rod-mortar interface of the anchor is dependent only on the surcharge load，and not on the service load. The shear force of the anchor rod is provided by the bonding force and friction；with the bonding force generated at the initial stage，and then changed into friction at the later stage. The excessive peak loading leads to the damage to the bonding and the loosening of the anchor structure. The over tension load of the prestressed anchor rod structure must exceed the service load to an extent in order to ensure a stable anchorage force in the service stage.
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Received: 21 October 2013
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| [1] 仲伟秋，王海超，何世钦. 受腐蚀钢筋混凝土结构性能的研究[J].辽宁工程技术大学学报，2003，22(10)：51–53.(ZHONG Weiqiu，WANG Haichao，HE Shiqin. Study on performance of corroding steelreinforced concrete structures[J]. Journal of Liaoning Technical University，2003，22(10)：51–53.(in Chinese))
[2] 程良奎. 岩土锚固的现状与发展[J]. 土木工程学报，2001，34(3)：7–13.(CHENG Liangkui. Present status and development of ground anchorages[J]. China Civil Engineering Journal，2001，34(3)：7–13.(in Chinese))
[3] 叶列平，冯 鹏. FRP在工程结构中的应用与发展[J]. 土木工程学报，2006，39(3)：24–36.(YE Lieping，FENG Peng. Applications and development of fiber-reinforced polymer in engineering structures[J]. China Civil Engineering Journal，2006，39(3)：24–36.(in Chinese))
[4] 袁 勇，贾 新，闫富友. 岩石GFRP 锚杆的可行性研究[J]. 公路交通科技，2004，21(9)：13–15.(YUAN Yong，JIA Xin，YAN Fuyou. Feasibility study on GFRP rock bolts[J]. Journal of Highway and Transportation Research and Development，2004，21(9)：13–15.(in Chinese))
[5] LI G W，NI C，PEI H F，et al. Stress relaxation of grouted entirely large diameter B-GFRP soil nail[J]. China Ocean Engineering，2013，27(4)：495–508.
[6] 李国维，倪 春，葛万明，等. 大直径喷砂FRP筋应力松弛试件锚固方法研究[J]. 岩土工程学报，2013，35(2)：227–234.(LI Guowei，NI Chun，GE Wanming，et al. Anchoring method for stress relaxation specimens with large-diameter sand-surface FRP bars[J]. Chinese Journal of Geotechnical Engineering，2013，35(2)：227–234.(in Chinese))
[7] 刘忠玉，尚亚龙，闫富有，等. GFRP筋的砂浆黏结性能试验研究[J]. 工业建筑，2008，3(6)：71–73.(LIU Zhongyu，SHANG Yalong，YAN Fuyou，et al. Experimental study on bond property of GFRP bars to cement mortar[J]. Industrial Construction，2008，3(6)：71–73.(in Chinese))
[8] BENMOKRANE B，XU H，BELLAVANCE E. Bond strength of cement grouted glass fibre reinforced plastic(GFRP) anchor bolts[J]. International Journal of Rock Mechanics and Mining Sciences，1996，33(5)：455–465.
[9] 闫富有，贾 新，袁 勇. 砂浆黏结GFRP锚杆试验研究[J]. 工业建筑，2004，34(12)：59–60.(YAN Fuyou，JIA Xin，YUAN Yong.
Experiments on the bonding behavior of GFRP bolts with mortar[J]. Industrial Construction，2004，34(12)：59–60.(in Chinese))
[10] 李国维，黄志怀，张 丹，等. GFRP 锚杆承载特征现场试验[J]. 岩石力学与工程学报，2006，25(11)：2 240–2 246.(LI Guowei，HUANG Zhihuai，ZHANG Dan，et al. Field test on load-bearing character of glass fiber reinforced polymer bolt[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(11)：2 240–2 246.(in Chinese))
[11] 黄志怀，李国维，王思敬. 不同围岩条件玻璃纤维增强塑料锚杆结构破坏机制现场试验研究[J]. 岩石力学与工程学报，2008，27(5)： 1 008–1 018.(HUANG Zhihuai，LI Guowei，WANG Sijing. Field test on pullout behaviors of anchorage structures with glass fiber reinforced plastic rods for different surrounding rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(5)： 1 008–1 018.(in Chinese))
[12] 何 政，孙 颖. 高应力重复加卸载下GFRP筋与混凝土的黏结性能[J]. 复合材料学报，2006，23(6)：149–157.(HE Zheng，SUN Ying. Bond behavior between GFRP rod and concrete subjected to high stress reversals[J]. Acta Materiae Compositae Sinica，2006，23(6)：149–157.(in Chinese))
[13] 李国维，戴 剑，倪 春，等. 大直径内置光纤光栅玻璃纤维增强聚合物锚杆梁杆黏结试验[J]. 岩石力学与工程学报，2013，32(7)：1 450–1 457.(LI Guowei，DAI Jian，NI Chun，et al. Bond behavior between concrete frame beam and large-diameter glass fiber reinforced potymer(GFRP) anchor rod with built-in fiber bragg grating sensor[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(7)： 1 450–1 457.(in Chinese))
[14] TIGHIOUART B，BENMOKRANE B，GAO D. Investigation of bond in concrete member with fibre reinforced polymer bars[J]. Construction and Building Materials，1993，12(8)：453–462.
[15] KANAKUBO T，YONEMARU K，FUKUYAMA H，et al. Bond performance of concrete members reinforced with FRP bars[J]. American Concrete Institute(ACI) SP-138，1993：767–788.
[16] 袁 培. GFRP增强混凝土梁正截面抗弯性能研究[硕士学位论文][D]. 重庆：重庆交通大学，2009.(YUAN Pei. The study on cross-section flexural properties of GFRP reinforced concrete beams[M. S. Thesis][D]. Chongqing：Chongqing Jiaotong University，2009.(in Chinese)) |
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2014, Vol. 33 
