活载效应下钢-混凝土组合梁表面涂层的疲劳应力分析  

Fatigue Stress Analysis of Surface Coating of Steel-Concrete Composite Beam under Living Load Effect

作　　者：唐士润 蔺鹏臻[2] 赵富康 TANG Shirun;LIN Pengzhen;ZHAO Fukang(Gansu Province Traffic Construction Project Management Company,Lanzhou 730000,China;Key Laboratory of Road Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]甘肃交建项目管理公司,兰州730000 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州730070

出　　处：《腐蚀与防护》2021年第9期66-73,94,共9页Corrosion & Protection

基　　金：甘肃省交通运输行科研项目资助(2020-08)。

摘　　要：基于等效应力原则,采用内聚力模型,通过ANSYS-Workbench在钢-混凝土组合梁受力最大处建立局部模型,分析钢-混凝土组合梁表面涂层在活载作用下的破损机理及其疲劳寿命预测。结果表明:涂层干膜厚度在210~300μm内,各层漆的拉应力从大到小依次为底漆、中间漆、面漆,各层漆的剪应力从大到小依次为中间漆、面漆、底漆,且随疲劳循环次数的增大,涂层体系越薄,面漆失效越快,抗疲劳性能越差;在只考虑活载效应时,干膜厚度为210μm时面漆的疲劳寿命约为20.9 a;干膜厚度为300μm时,面漆的疲劳寿命可达26.6 a。Based on the principle of equivalent stress, the local model of steel-concrete composite beam was established by ANSYS-Workbench with cohesive force model. The damage mechanism of surface coating of steel-concrete composite beam and its fatigue life prediction under live load were analyzed. The results showed that when the dry film thickness of coating was 210-300 μm, the tensile stress of each layer of coating was primer coating, intermediate coating and finishing coating in order from large to small, the shear stress of each layer of coating was intermediate coating, finishing coating and primer coating in order from large to small, and with the increase of fatigue cycle times, the thinner the coating system, the faster the finishing coating would fail and the worse the fatigue resistance. When only live load effect was taken into account, the fatigue life of finishing coating was about 20.9 a when dry film thickness was 210 μm. When dry film thickness was 210 μm, the fatigue life of finishing coating could reach 26.6 a.

关 键 词：钢-混凝土组合梁 防腐蚀涂层 有限元法 疲劳应力 寿命预测 

分 类 号：TU593[建筑科学—建筑技术科学]