风沙冲蚀作用下钢结构涂层的应力计算与分布特征  

Stress Calculation and Distribution Characteristics of Steel Structure Coatings under the Action of Sand Erosion

作　　者：蔺鹏臻[1] 魏亚鹏 陈星 LIN Peng-zhen;WEI Ya-peng;CHEN Xing(Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]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 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《表面技术》2022年第6期214-220,266,共8页Surface Technology

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(甘交科技函2020-08)。

摘　　要：目的合理计算风沙冲蚀作用下钢结构涂层的应力,并客观反映其分布特征。方法基于接触力学和结构动力学理论,建立风沙侵蚀钢结构涂层时的冲蚀荷载表达式,利用位势理论推导出在冲蚀荷载作用下钢结构涂层的应力计算公式,并结合西北地区风沙流特征对钢结构涂层不同位置处的应力分布规律进行分析。结果涂层的面漆和中间漆厚度宜分别取165~210μm和145~165μm。面漆应具有良好的抗拉、抗压和抗剪性能,以防止发生表面开裂和次表层塑性屈服现象;中间漆的抗剪和抗压强度应分别不小于250 kPa和800 kPa。钢结构建筑物的最小迎风面积应尽可能垂直于风向,以降低风沙对钢结构建筑物的冲蚀破坏。结论在风沙冲蚀作用下钢结构涂层宜设置底漆、中间漆和面漆3层,且底漆、中间漆和面漆的厚度应依次增大;面漆抗压和抗剪强度均要优于中间漆和底漆,以防止表面开裂和次表层塑性屈服。In order to reasonably calculate the stress of the steel structure coating under the action of sand erosion,and objectively reflect its distribution characteristics.Based on the theories of contact mechanics and structural dynamics,the expression of the erosion load when the steel structure coating is eroded by wind sand is established,and the stress calculation formula of the steel structure coating under the erosion load is derived by using the potential theory.At the same time,combined with the characteristics of wind-sand flow in the northwest region,the stress distribution law at different positions of the steel structure coating was studied.The research results show that the thickness of the topcoat and intermediate paint of the coating should be within the range of 165-210μm and 145-165μm,respectively.The topcoat should have good tensile,compressive and shear resistance to prevent surface cracking and plastic yielding of the subsurface layer;the shear and compressive strength of the intermediate paint should be no less than 250 kPa and 800 kPa,respectively.The minimum windward area of the steel structure building should be as perpendicular to the wind direction as possible to reduce the erosion damage to the steel structure building.Under the action of wind and sand erosion,the steel structure coating should be set to three layers of primer,intermediate paint and topcoat,and the thickness of the primer,intermediate paint and topcoat should be increased in sequence;the compressive and shear strength of the topcoat both are better than intermediate paint and primer to prevent surface cracking and subsurface plastic yielding.

关 键 词：应力分析 应力分布 冲蚀荷载 涂层 风沙 钢结构 

分 类 号：TH117[机械工程—机械设计及理论]