戈壁风沙环境下钢结构涂装层与基体界面应力研究  

Study on Interfacial Stress Between Coating Layer of the Steel Structure and the Substrate in Gobi Wind-Sand Environment

作　　者：魏亚鹏 蔺鹏臻[2] 马俊军 赵富康 李杰[1] WEI Ya-peng;LIN Peng-zhen;MA Jun-jun;ZHAO Fu-kang;LI Jie(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《材料保护》2021年第9期7-13,共7页Materials Protection

基　　金：国家自然科学基金重大项目(11790281);甘肃省交通运输厅科技项目(2020-08)资助。

摘　　要：为了分析戈壁地区风沙冲击作用下钢结构涂装层与基体界面的应力问题,以戈壁地区风沙特征为背景,基于研究涂层材料与基体界面应力的镜像点法,通过Dirichlet等值性原理和边界条件,建立了钢结构涂装层与基体界面应力的研究方法,研究了呈现空间分层异性的风沙粒子在高度、冲蚀角度和冲蚀速度的耦合条件下冲蚀涂层时界面应力的变化规律。结果表明:在西北戈壁地区的风沙特征下,钢结构涂装层与基体的界面应力在距地面1.5 m高度处最大,且1.5 m高度处界面应力最大值约为3.0 m和5.0 m高度处界面应力最大值的6倍和11倍。钢结构建筑物在1.5 m高度及以下的部分应采用底漆、中间漆和2道面漆的多层涂装体系,且第2道面漆应做加厚和光滑处理的涂装工艺。界面应力与沙粒粒径和冲击速度均成正相关。随距沙粒冲击点距离的逐渐增大,界面压应力和切应力均呈现先增大后减小的变化规律。在同一位置处,相同冲击速度下,界面压应力在冲击角度为75°~90°范围时较大,界面切应力在冲击角度为30°~45°范围时较大。In order to analyze the stress problem at the interface between the coating layer of steel structure and the substrate under the impact of the wind-sand in the Gobi region,the research method for the stress at the interface between the steel structure coating and the substrate was established based on the mirror point method of studying the stress at the interface between the coating material and the substrate,through the Dirichlet equivalence principle and boundary conditions on the background of characteristics of the wind-sand in the Gobi region.The change laws of interfacial stress were studied when the sand particles with phenomenon of spatial stratification impacted the coating layer under the coupling conditions of height,impact angle and impact velocity.Results showed that under the characteristics of wind and sand in the Northwest Gobi area,the interface stress between the coating layer of the steel structure and the substrate was the largest at a height of 1.5 m from the ground.The maximum value of the interface stress at the height of 1.5 m was about 6 times and 11 times of the maximum value of the interface stress at the height of 3.0 m and 5.0 m.For steel structure buildings at a height of 1.5 m and below,a multi-layer coating system of primer,intermediate paint and two top coats should be used,and the second top coat should be thickened and smoothed.The interfacial stress was positively correlated with the sand particle size and impact velocity.With the gradual increase of the distance from the impact point of the sand particle,both the interfacial compressive stress and the shear stress showed the law of increasing first and then decreasing.At the same position and the same impact velocity,the interfacial compressive stress was larger when the impact angle was in the range of 75°~90°,and the interface shear stress was larger when the impact angle was in the range of 30°~45°.

关 键 词：钢结构 涂层 风沙 界面应力 镜像点法 

分 类 号：TG174.44[金属学及工艺—金属表面处理]