摘要
锈蚀是户外服役钢结构力学性能退化的主要原因,本研究从输电铁塔角钢构件上取样,开展加速锈蚀试验。选取不同锈蚀程度的试件作为研究对象,借助三维扫描仪采集了试件表面形貌数据,分析了锈蚀宏观指标(锈蚀层厚度)和细观指标(分形维数)随锈蚀程度的变化规律。根据锈蚀试件表面的分形性质,提出以锈蚀率、锈蚀层厚度及分形维数为指标,通过随机中点位移法构造分形布朗曲面,实现对钢结构锈蚀表面的精准模拟。结合锈蚀试件三维轮廓曲面统计数据,建立了锈蚀试件的三维模型,并利用ABAQUS软件对模型的受拉性能进行了数值模拟。计算结果表明:所提出基于分形布朗运动(FBM)的锈蚀钢材受拉性能分析方法,能够有效将锈蚀指标引入锈蚀模型中,为评估非均匀锈蚀钢材的受拉性能提供了可行的方法。
Corrosion is the main cause of mechanical property degradation of steel structure.Therefore,an accelerated corrosion test was carried out using samples from the angle steel of the transmission tower.Samples with different degrees of corrosion were selected as the research objects.The surface morphology data of the samples were collected with the help of three-dimensional scanner,and the variation rule of the macroscopic corrosion index(thickness of rust layer)and the microscopic index(fractal dimension)with the corrosion degree was analyzed.According to the fractal properties of the surface of corroded specimens,a method was proposed to simulate the surface of corroded specimens by using random midpoint displacement method to construct fractal Brownian surface with corrosion rate,thickness of rust layer and fractal dimension as indexes.Based on the statistical data of the three-dimensional contour surface of the corroded specimen,three-dimensional models of the corroded specimens were established,and the mechanical properties of the models were simulated by ABAQUS software.The results show that the proposed method based on fractal brownian motion(FBM)can effectively introduce the corrosion index into the corrosion model and provide a feasible method for evaluating the tensile properties of non-uniformly corroded steel.
作者
张衡
江文强
郭玉程
高飞
ZHANG Heng;JIANG Wenqiang;GUO Yucheng;GAO Fei(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《建筑钢结构进展》
北大核心
2025年第9期64-72,共9页
Progress in Steel Building Structures
基金
河北省“三三三人才工程”资助项目(C20231056)。
关键词
输电铁塔
非均匀锈蚀
加速锈蚀试验
分形理论
表面重建
随机模型
受拉性能
transmission tower
non-uniform corrosion
accelerated corrosion test
fractal theory
surface reconstruction
stochastic model
tensile property
