不同疲劳荷载加载次数作用下环氧涂层钢筋混凝土试件性能研究  

Study on RC test specimens with uncoated and epoxy-coated reinforcements under fatigue loads with different loading cycles

作　　者：陈瑜 桂世杰 王小惠 CHEN Yu;GUI Shijie;WANG Xiaohui(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学海洋科学与工程学院港口航道与海岸工程系,上海201306

出　　处：《混凝土》2020年第12期38-43,49,共7页Concrete

基　　金：国家自然科学基金项目(51178266)。

摘　　要：为探讨环氧涂层钢筋混凝土构件的使用性能如何受到相同使用荷载水平下不同荷载疲劳循环次数的影响,在相同的疲劳荷载和不同的疲劳加载次数下,对10个无涂层和环氧涂层钢筋混凝土梁进行了疲劳加载试验。并对试件的侧面最大裂缝宽度和钢筋应变随疲劳加载的变化进行了分析。分析结果表明:随疲劳加载次数的增加,侧面最大裂缝宽度和钢筋应变均有所增加。在加载次数相同的情况下,含较厚涂层钢筋混凝土试件内的钢筋应变的均值较含无涂层和较薄涂层钢筋试件内钢筋的应变均值稍大。In order to study the influence of fatigue load with the same load upper limit and different cycles range and as well as coating thicknesses of the reinforcing bars on the service performance of reinforced concrete(RC)elements,10 RC test specimens with uncoated and epoxy-coated reinforcements were experimentally loaded.The developments of maximum crack widths at the two lateral surfaces and the average steel strain versus fatigue cycles were mainly studied.It is concluded that,for test specimens subjected to the fatigue load with the same load range,the average steel strain and the maximum crack widths increase with the increment of the loading cycles.For the test specimens subjected to the fatigue load with the same load range and loading cycles,slightly larger average steel strains of test specimens with thicker coated bars are shown compared with those of the test specimens with uncoated and thinner coated bars.

关 键 词：环氧涂层钢筋 疲劳加载次数 涂层厚度 裂缝宽度 钢筋应变 

分 类 号：TU528.01[建筑科学—建筑技术科学]