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Fatigue of Concrete Beams Strengthened with Glass-Fiber Composite under Flexure |
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| Authors: | Tianlai Yu Chengyu Li Junqing Lei Hongxiang Zhang |
| Affiliation: | 1Professor, College of Civil Engineering, Northeast Forestry Univ., No. 26 Hexing Rd., Xiangfang District, Harbin 150040, P.R. China; currently, Postdoctoral Fellow, School of Civil Engineering, Beijing Jiaotong Univ., No. 3, Shangyuancun, Xizhimenwai, Beijing, 100044, P.R. China. E-mail: bosstumu@163.com 2Assistant Professor, Univ. of Colorado, Denver, CO 80217 (corresponding author); currently, Guest Professor, College of Civil Engineering, Northeast Forestry Univ., No. 26 Hexing Rd., Xiangfang District, Harbin 150040, P.R. China. E-mail: cheng.li@ucdenver.edu 3Professor, School of Civil Engineering, Beijing Jiaotong Univ., No. 3, Shangyuancun, Xizhimenwai, Beijing, 100044, P.R. China. 4Professor, College of Civil Engineering, Northeast Forestry Univ., No. 26 Hexing Rd., Xiangfang District, Harbin 150040, P.R. China. |
| Abstract: | A detailed investigation on the fatigue performance of concrete beams strengthened with glass-fiber composite (GFC) is performed in this study. Cyclic load tests were conducted on reinforced concrete beam specimens strengthened with two layers of GFC bonded to the beams’ bottom surface using a special epoxy resin. Midspan-deflection and cracks were measured at different numbers of load cycles and varying fatigue loading levels during the tests. Investigated parameters include total midspan-deflection, residual midspan-deflection after unloading, crack width, crack length, and crack distribution at different loading stages. The fatigue performance of concrete beams strengthened with GFC was evaluated by comparing the deflections, crack sizes, and crack distributions with unstrengthened beams. The concrete beams strengthened with GFC investigated in this study showed significant improvement on fatigue performance. |
| Keywords: | Glass fibers Fatigue Strength Concrete beams Cyclic tests Bending Concrete tests |