含锈蚀和疲劳损伤混凝土梁的长期变形性能试验研究  

Experimental study on long-term deformation behavior of concrete beams with corrosion and fatigue damage

作　　者：朱明江 张军 金伟良[1] 毛江鸿 钟小平[4] 樊玮洁 ZHU Mingjiang;ZHANG Jun;JIN Weiliang;MAO Jianghong;ZHONG Xiaoping;FAN Weijie(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310012,China;School of Civil Engineering and Architecture,Ningbo Tech University,Ningbo 315100,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,China;College of Architecture Science and Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310012 [2]浙大宁波理工学院土木建筑工程学院,浙江宁波315100 [3]四川大学建筑与环境学院,四川成都610065 [4]扬州大学建筑科学与工程学院,江苏扬州225009

出　　处：《混凝土》2023年第11期7-11,共5页Concrete

基　　金：国家自然科学基金(51820105012,51908496,51878610,52178171,51638013);浙江省自然科学基金(LQ19E080011);宁波市自然科学基金(2021J168)。

摘　　要：为研究结构在锈蚀、疲劳、徐变多因素作用下的长期变形性能,开展了含锈蚀、疲劳损伤钢筋混凝土梁的长期持载试验,记录并分析了不同损伤试件的裂缝、应变及挠度发展规律。研究结果表明:持载作用下,试件原有裂缝的宽度和长度都有所增加,还会产生新的竖向裂缝,裂缝变化主要集中在持载前期,之后趋于稳定;含疲劳损伤试件新增竖向裂缝较少,含锈蚀损伤试件还会产生新的纵向裂缝;锈蚀损伤越大,试件受压区混凝土徐变应变越小;锈蚀损伤和疲劳损伤会缩短徐变应变进入相对平稳期的时间,提前了约10 d;锈蚀通过增加抗弯刚度来影响试件的收缩徐变挠度,疲劳以及锈蚀和疲劳共同作用主要通过削弱抗弯刚度和消耗受压区混凝土塑性变形来影响试件的收缩徐变挠度。In order to study the long-term deformation performance of the structure under the action of corrosion,fatigue and creep,the long-term load-bearing test of reinforced concrete beams with corrosion and fatigue damage was carried out,the development laws of cracks,strains and deflections of different damaged specimens were recorded and analyzed.The results showed that the width and length of the original cracks of the specimen increased under the action of sustained load,and new vertical cracks appeared.The changes of cracks mainly focused on the early stage of sustained load,and then tended to be stable.The specimens with fatigue damage had few new vertical cracks,and the specimens with corrosion damage had new longitudinal cracks.The greater the corrosion damage,the smaller the creep strain of concrete in the compression area of the specimen.Corrosion damage and fatigue damage will shorten the time of creep strain entering the relatively stable period,about■in advance.Corrosion affects the shrinkage and creep deflection of the specimen by increasing the flexural stiffness.Fatigue and the joint action of corrosion and fatigue mainly affect the shrinkage and creep deflection of the specimen by weakening the flexural stiffness and consuming the plastic deformation of concrete in the compression zone.

关 键 词：钢筋混凝土梁 长期变形性能 疲劳损伤 锈蚀损伤 徐变变形 

分 类 号：TU528.01[建筑科学—建筑技术科学]