考虑二次受力状态下钢板加固锈蚀RC梁抗弯刚度计算方法和试验研究*
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（长沙理工大学土木与建筑学院， 长沙 410114）
［摘要］考虑工程中RC桥梁存在二次受力的情况以及钢板与混凝土之间的协同工作系数，同时引入改进的坑蚀模型，建立了钢板加固锈蚀RC梁抗弯刚度理论模型。通过9根钢板加固锈蚀RC梁抗弯弹性试验验证了理论模型的正确性，对比了考虑二次受力和不考虑二次受力状态下试验梁的刚度。结果表明，二次受力状态下挠度理论值与试验值比值的均值和变异系数分别为1.02和0.13，理论推导的数值与试验值较为吻合。钢板加固能够有效提升锈蚀RC梁的抗弯刚度，不考虑二次受力的试验梁刚度被高估了，而不考虑钢板与混凝土间变形协调的试验梁刚度被低估了。［关键词］二次受力; 钢板加固; 锈蚀RC梁; 抗弯刚度中图分类号：TU398.7 文献标识码：A 文章编号：1002-848X(2015)20-0087-05
Calculation method and experimental research of the bending stiffness of corroded RC beams strengthened by steel plates considering the secondary load stateTang Huang, Peng Jianxin, Zhang Jianren(School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410114, China)Abstract: Considering the secondary load condition of RC bridge beam in engineerings, coordination working coefficient between steel plates and concrete and the introduction of improved corrosion-proof model, the bending stiffness theoretical model of corroded RC beams strengthened by steel plates was established. The flexural elasticity tests with corroded 9 RC beams strengthened by steel plates were carried out to verify the correctness of the theoretical model. The stiffness of test beams under secondary load state was compared with that of the common beams. The results show that the mean value and variation coefficient of the ratio between the deflection theoretical value and the experimental value under secondary load state is 1.02 and 0.13 respectively. The numerical results are in good agreement with the experimental values. Steel reinforcement can effectively enhance the bending stiffness of corroded RC beams. The stiffness of test beams is overrated without taking into account the secondary load, and the stiffness of test beams is undervalued without taking into account the deformation compatibility between the steel plates and concrete.Keywords: secondary load; strengthened by with steel plate; corroded RC beam; bending stiffness
*国家重点基础研究发展计划（2015CB057706），国家自然科学基金项目资助(51178060,51378081)，交通部主干学科应用基础研究项目资助(2014319825160)，博士后基金资助(2014M552127)，桥梁工程湖南省高校重点实验室开放基金资助项目(13KA04)。作者简介：唐皇，博士研究生，Email:806707617@qq.com。
