摘要
研究目的:为验证纤维编织网增强混凝土(TRC)应用于桥梁加固的可行性,本文针对现役钢筋混凝土(RC)桥梁主梁存在的承载力不足和挠度较大等问题,将TRC用于加固老旧RC桥梁主梁,基于现场四点弯曲试验,研究TRC加固老旧足尺空心板梁的抗弯性能。研究结论:(1)TRC加固梁主要发生了纤维编织网断裂、纤维编织网与基体相对滑移、局部脱粘以及层间剥离的失效模式,加固后其承载力提高了9.09%~30.3%;(2)TRC加固使空心板梁挠度减小了8.4%~26.8%,有效提升了其刚度,并限制了裂缝的开展,但延性降低了13.8%~31.9%;(3)本试验获得的最优纤维编织网搭接长度为400mm;(4)对TRC加固空心板梁的承载力进行了计算,其理论值与试验值吻合程度较好;(5)本研究成果对TRC在桥梁工程的加固应用具有一定的指导意义。
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.
作者
尹世平
邢澳杰
苏迅
杨雨厚
冯坚
黎力韬
YIN Shiping;XING Aojie;SU Xun;YANG Yuhou;FENG Jian;LI Litao(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;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;Guangxi Transportation Science and Technology Group Co.Ltd,Nanning,Guangxi 530007,China)
出处
《铁道工程学报》
EI
CSCD
北大核心
2024年第11期47-53,共7页
Journal of Railway Engineering Society
基金
国家自然科学基金项目(52278322)
广西重点研发计划(桂科AB17292062)
2020年玉林市科学研究与技术开发计划(玉市科20202926)。
