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| Study on the Flexural Performance of Old Hollow Slab Beams Strengthened with Textile Reinforced Concrete |
| YIN Shiping1, XING Aojie1, SU Xun2, YANG Yuhou3, FENG Jian3, LI Litao3 |
1. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China;
2. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;
3. Guangxi Transportation Science and Technology Group Co. Ltd, Nanning, Guangxi 530007, China |
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Abstract Research purposes: To verify the feasibility of applying textile reinforced concrete (TRC) to bridge strengthening, this paper investigates the flexural performance of TRC strengthening old hollow slab beams based on four-point bending tests in the field to address the problems of inadequate load carrying capacity and large deflection of in-service reinforced concrete (RC) bridge main beams.
Research conclusions: (1) The specimens mainly suffer from the failure modes of fracture of the textile, relative slip of the textile and the matrix, local debonding and interlaminar peeling, and the load carrying capacity is increased by 9.09%~30.3% by TRC reinforcement. (2) TRC reinforcement reduces the deflection of hollow slab beams by 8.4% to 26.8%, effectively improving their stiffness and limiting the development of cracks, but reducing ductility by 13.8% to 31.9%. (3) The optimum textile lap length obtained from this test is 400 mm. (4) The load carrying capacity of TRC reinforced hollow slab beams is calculated, and the theoretical value is in good agreement with the test value. (5) The research results have certain guiding significance for the application of TRC in the strengthening of bridge projects.
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Received: 06 April 2022
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2024, Vol. 41 
