Bond durability of glass fiber-reinforced polymer bars embedded concrete beams with work crack(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年05期
- Page:
- 52-59
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Bond durability of glass fiber-reinforced polymer bars embedded concrete beams with work crack
- Author(s):
- YANG Wen-rui; HE Xiong-jun; DAI Li
- School of Transportation， Wuhan University of Technology， Wuhan 430063, Hubei, China
- Keywords:
- structural engineering; GFRP bar; concrete beam; durability; bond performance; work crack
- PACS:
- TU528
- DOI:
- -
- Abstract:
- To provide the more accurate experimental data and theory to guide the design of GFRP reinforced concrete beams for the longterm bond durability, based on the sustained load working state of the actual concrete beam with work crack, experimental and analytical investigations of bond performance of glass fiberreinforced polymer (GFRP) bars embedded in concrete beams with crack was presented. Beams were conditioned with sustained flexural loads in outdoor, tap water and 60 ℃ alkaline solution for 90, 180, 270 d, after which they were subjected to eccentric threepoint flexure tests to evaluate bond performance, a theory calculation method of bond stress with different slip values was proposed, and the maximum bond stresses under various conditions after 270 d were determined according to the test data and theoretical calculation. The results show that the slip load loss, deflection values and the maximum bond stress reach to 38.5% and 59.4% respectively, and the deflection values increase 46.3% when beams are conditioned with alkaline environment for 270 d. The changing range of slip loads and deflection values of GFRP reinforced concrete beams without work crack is less than that of beams with work crack under any erosion environment condition. The maximum bond stress for GFRP reinforced concrete beams without work crack is bigger than that of beams with work crack, and the loss ratio is less than beams with work crack. Among the three environments, alkaline environment can obviously deteriorate the bond performance of GFRP reinforced concrete beam, and the environmental impact is largely intensified by work crack on the bond performance of GFRP reinforced concrete beams in the worse way.
Last Update: 2016-10-06