盐冻环境下钢筋混凝土梁抗弯性能试验研究
徐 港 ，
(1．三峡大学
2．三峡地区地质灾害与
李运攀 ，潘 琪 ，谢晓娟
土木与建筑学院，湖北宜昌443002；
生态环境湖北协同创新中心，湖北宜昌443002)
摘 要：试验研究了盐冻环境下钢筋混凝土梁抗弯性能的退化规律，分析比较了完好梁和经历25、
50、75及100次盐冻融循环作用梁的承载力和变形性能。结果表明：受冻梁截面混凝土应变仍满足
平截面假定，受力特征与完好梁相似；影响盐冻融环境下梁承载力的主要因素是受压区混凝土保护
层的剥落，其次是混凝土强度的降低，而钢筋与混凝土粘结性能退化的影响并不显著；混凝土强度
降低、保护层损伤及粘结性能退化均是冻融环境下混凝土梁变形增大的重要因素，梁刚度的降低程
度除与冻融次数相关外，还受冻融损伤位置和持荷水平影响。
关键词：钢筋混凝土梁；盐冻；耐久性；抗弯性能
中图分类号：TU375．02 文献标志码：A 文章编号：1674—4764(2O14)03～0086—06
Experim ental Analysis on Flexural Performance of
Reinforced Concrete Bearn in Salt—frost Environment
Xu Gang ，Li Yunpan ，Pan Qi ，Xie Xiaojuan
(1．College of Civil Engineering 8L Architecture，China Three Gorges University，Yichang 443002，Hubei，P．R．China；
2．Collaborative Innovation Center for Geo—Hazard and ECO—Environment in
Three Grorges Area，Yichang 443002，H ubei，P． R．China)
Abstract：Under the salt frost environment，the flexural behavior of reinforced concrete was studied．The
bearing capacity and deform ation performance of the beams were analyzed by com paring with the reference
beam(undamaged)and beams subjected to 25，50，75 and 100 salt freeze—thaw cycles respectively．The
results showed the plane section hypothesis stil1 was satisfied for the concrete strains of frost beam section，
and the mechanical characteristics of frost beam was similar to reference：The main reason to affect the
beam bearing capacity under salt freeze—thaw environment was the concrete cover scaling in the compressive
zone． Secondly， it was the reduction in concrete strength， while the degradation of bond properties
between rebar and concrete was not a dominated factor；the deform ations of concrete beam increased mainly
due to the reduction in concrete strength，the damage of concrete cover and the degradation of bond
properties．In addition to the number of freeze—thaw cycles，the positions of freeze—thaw damage and the
load level affected the degree of reduction in beam stiffness．
Key words：reinforced concrete beam ；salt—frost；durability；flexural performance
冻融环境下构件抗力性能的退化并不仅取决于
材料力学性能的降低，冻融引起的构件截面尺寸减小
以及钢筋混凝土间粘结性能劣化也是重要原因。近
年来，针对混凝土构件抗冻性的研究正持续展开 “]，
但在相关试验研究成果中，由于受试验设备制约，所
采用试件尺寸普遍较小，多限于材料试验试件尺度

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