随机点蚀对槽钢柱轴压承载力劣化影响分析
Analysis on the Influence of Random Pitting Corrosion on the Deterioration of Axial Compression Bearing Capacity of U-steel Column
杨明飞 1王飞 1董悦奇2
作者信息
- 1. 安徽理工大学土木建筑学院,安徽 淮南 232001
- 2. 上海建工集团股份有限公司总承包部,上海 200080
- 折叠
摘要
目的 为了研究随机点蚀对槽钢柱轴压承载力劣化影响,方法制作了带有随机点蚀损伤缺陷的构件,对其进行了轴压试验.结果 随着随机点蚀损伤强度DOP的增加,不同损伤区域的损伤构件屈服承载力在逐渐降低,降低幅度达到30％.随机点蚀损伤构件的应变曲线拐点先于无点蚀损伤构件出现.同时在相同荷载情况下,有点蚀损伤构件的应变值均大于无点蚀损伤构件应变值.接着建立了随机损伤构件的数值模型,利用试验结果对模型合理性进行了验证.最后通过验证后的数值模型,对点蚀损伤强度DOP、点蚀坑深度和点蚀坑数量等相关参数进行了讨论.结论 数值结果显示,点蚀损伤强度、点蚀坑深度和点蚀坑数量的增加都降低槽钢柱的屈服承载力,并且在相同点蚀数量P和相同DOP情况下,随着蚀坑深度与腹板(或翼缘)厚度的比值J的增加,槽钢柱的屈服承载力均呈现线性下降的趋势.
Abstract
Objective In order to study the effect of random pitting corrosion on the deterioration of axial compres-sion bearing capacity of U-steel column.Methods The components with random pitting defect were designed and tested by the axial pressure test.Results The experimental results showed that as the random pitting damage strength DOP increased,the yield bearing capacity of damaged components in different damage areas gradually decreased,even by 30％.The inflection point of the strain curve of components with random pitting damage ap-peared before those without pitting damage.At the same time,under the same load,the strain values of compo-nents with pitting damage were greater than those of components without pitting damage.Subsequently,a numeri-cal model of random damaged components was established and the rationality of the model was verified by using the experimental results.Finally,through the validated numerical model,relevant parameters such as pitting damage intensity DOP,pitting depth and pitting number were discussed.Conclusion The numerical results show that the increase of the strength of the pitting damage,depth and number reduces the yield bearing capacity of U-steel columns.Meanwhile,under the same number of pitting corrosion P and the same DOP,the yield bearing ca-pacity of U-steel columns shows a linear decreasing trend with the increase of the ratio J of pit depth to web(or flange)thickness.
关键词
随机点蚀/槽钢柱/劣化/点蚀损伤强度/屈服承载力Key words
random pitting/U-steel column/deterioration/pitting damage strength/yield bearing capacity引用本文复制引用
基金项目
安徽省高校自然基金资助项目(KJ2016A209)
安徽理工大学人才引进基金资助项目(ZY044)
出版年
2024
NETL
NSTL
维普
万方数据