Bond Mechanical Properties of Glass Fiber Reinforced Polymer Anti-Floating Anchor in Concrete Baseplate
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Bond Mechanical Properties of Glass Fiber Reinforced Polymer Anti-Floating Anchor in Concrete Baseplate BAI Xiaoyu 1,2 (), ZHENG Chen 1 ( ), ZHANG Mingyi 1,2∗ (), LIU Xueying 1 (), KUANG Zheng 1 ( ) (1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China; 2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, Shandong, China)
© Shanghai Jiao Tong University and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Combined with fiber Bragg grating (FBG) sensing technology, four glass fiber reinforced polymer (GFRP) anti-floating anchors and four steel anti-floating anchors were tested for on-site destructive failure to investigate the anchoring performance and the bonding characteristics between GFRP anti-floating anchor and concrete floor. The test results show that bending GFRP anchor will be broken at the common boundary between vertical anchorage section and bending section during the pullout process, and the spring-back load provided by the rupture contributes to a decrease of bearing capacity and an inflection point on the load-slip curve. The loaddisplacement curve of the straight anchor GFRP anti-floating anchor is smoother and has better predictability than the same type of steel anchor. Additionally, different forms of GFRP anti-floating bolt have different bondslip constitutive relations. By introducing the sliding-slip correction factor of bending bolt, constitutive models describing the rising-section of sliding-slip relation of bending and straight-anchored GFRP anti-floating bolt are established respectively. The model can fit the test results rightly. Key words: glass fiber reinforced polymer (GFRP), anti-floating anchor bolt, axial force, bearing capacity, loadslip, constitutive relationship CLC number: TU 473 Document code: A
0 Introduction With the deepening of the excavation depth of urban building (structure), the anti-floating problem has become increasingly prominent. Anti-floating anchors are widely used to solve the anti-floating problem of buildings (structures) due to their strong adaptability, good stress dispersion, convenient construction and low cost. Due to corrosive ions in groundwater, stray currents generated by urban rail transit projects such as subways, and changes in groundwater levels, the working environment of anti-floating anchors is more severe than ordinary anchors, and the durability of traditional steel anchors is greatly reduced. Security issues of traditional steel anchor frequently occurred[1-3] . ComReceived date: 2019-08-16 Foundation item: the National Natural Science Foundation of China (Nos. 51708316 and 51778312), the China Postdoctoral Science Foundation (No. 2018M632641), the Shandong Provincial Key Research and Development Program (Nos. 2017GSF16107 and 2018GSF117008), and the Shandong Provincial Natural Science Foundation (Nos. ZR2016EEQ08 and ZR2017PEE006) ∗E-mail: [email protected]
pared with steel anchors, glass fiber reinforced polymer (GF
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