为了研究不同钢板加固方式对锈蚀RC梁承载性能的影响，探索不同钢板加固方式的加固效应，本文通过静力荷载试验对比研究了钢板抗弯加固、抗剪加固和抗弯-抗剪组合加固锈蚀RC梁在承载力、变形、破坏模式和延性等方面的特点，分析了不同加固方式的优缺点。研究结果表明：对于钢板厚度分别为3mm、4mm和5mm的抗弯加固锈蚀梁，随钢板厚度增加1mm，其极限承载力而增加7-18kN。组合加固效果最明显，其极限承载力相比于锈蚀梁提高了107.7%。组合加固锈蚀梁的抗变形能力最强，其次是抗弯加固锈蚀梁，同时钢板厚度增加对抗弯加固锈蚀梁的抗变形能力有积极作用。组合加固较其他两种加固方式能更有效地提高锈蚀梁的延性，其延性相比锈蚀梁提高了320.4%，其次是抗剪加固锈蚀梁。抗弯加固锈蚀梁的延性相比其他两种加固梁都要小，并且随着钢板厚度增加，其延性先增加后减小。评价抗弯和抗剪加固锈蚀梁的加固效果时需综合考虑抗变形能力和延性。

In order to explore the influence of different strengthening schemes using steel plate on the bearing capacity of corroded RC beams, and the strengthening effect of different strengthening schemes are explored. The characteristics in the bearing capacity, deformation, failure mode and ductility of corroded RC beams strengthening by steel plate with flexural strengthening schemes, shear strengthening scheme and flexure-shear combination strengthening scheme are compared, and the advantages and disadvantages of different strengthening schemes are analyzed. The results show that: for the flexure-strengthened corroded beam which steel plate thickness are 3mm, 4mm and 5mm, respectively, the ultimate bearing capacity of flexural strengthened corroded beams increases by 7-18kN with the increase of steel plate thickness. The effect of combined strengthening is most obvious, and the ultimate bearing capacity increases by 107.7% compared with corroded beams. Combined strengthened corroded beams have the strongest deformation resistance, the followed is flexure-strengthened corroded beams, the increase of steel plate thickness has a positive effect on the deformation resistance of flexure-strengthened corroded beam. The combined strengthening scheme can most effectively improve the ductility of corroded beam than the other two strengthening schemes, the ductility of which is improved by 320.4% compared with corroded beam, followed by shear strengthened corroded beams. The ductility of flexure-strengthened corroded beam is smaller than that of other two kinds of strengthened beams, and which increases first and then decreases with the increase of steel plate thickness. The deformation resistance and ductility should be considered comprehensively when evaluating the strengthening effect of flexure and shear strengthened corroded beams.

TU375.4

国家重点基础研究发展计划 (973计划)项目(2015CB057705)；湖南省自然科学青年基金[2019JJ50023]；湖南省自然科学基金[2018JJ2438]；湖南省教育厅科学研究项目[18A136和18C0855]；2020年益阳市银城科技人才托举工程