网架周边杆件随机腐蚀对整体稳定性的影响
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摘要
基于随机缺陷理论和概率论方法,计算杆件的腐蚀截面积在服役时间内连续14年的均值和方差,将腐蚀截面积均值反推得到随时间变化的杆件均匀腐蚀深度,从而确定杆件连续14年的腐蚀模型。结合局部环向腐蚀钢管试验建立合理的有限元模型,对腐蚀钢管进行系统的研究,得出了考虑环向不同腐蚀深度和腐蚀面积时钢管极限承载力的近似公式。然后使用ANSYS软件对某网架工程实例进行考虑局部随机腐蚀的模拟研究。将局部腐蚀分为支座处单边、双边、三边、周边4种情况,对整体结构进行静、动力非线性分析。结果表明,在所选腐蚀参数下,该网架局部环向腐蚀引起的整体破坏发生在腐蚀第13年,结构破坏前没有明显预兆,且破坏过程的结构反应时间很短,危害性很大。
Based on probability and random theory,this article calculated the mean of the bars' corrosion area and its' variance,then,the relationship between the corrosion depth and the time can be obtained.A continuous corrosion model ranging 14 years can be determined.And a finite element model of steel corrosion is established,with the information accumulated from the localized corrosion of steel tube experiments.The approximate formulas for ultimate bearing capacity of the steel tube also obtained,and different corrosion depth and area are taken consideration in these formulas.Then make a simulation research of some grids engineering examples considering local random corrosion,local corrosion into unilateral and bilateral,triangles,four cases,make static and dynamic analysis about the whole structure.The results show that the corrosion damage caused by local corrosion occurred is in 13th year under the selected corrosion parameters,no apparent signs before structural damage,the failure process and structural response time is very short and dangerous.
Based on probability and random theory,this article calculated the mean of the bars' corrosion area and its' variance,then,the relationship between the corrosion depth and the time can be obtained.A continuous corrosion model ranging 14 years can be determined.And a finite element model of steel corrosion is established,with the information accumulated from the localized corrosion of steel tube experiments.The approximate formulas for ultimate bearing capacity of the steel tube also obtained,and different corrosion depth and area are taken consideration in these formulas.Then make a simulation research of some grids engineering examples considering local random corrosion,local corrosion into unilateral and bilateral,triangles,four cases,make static and dynamic analysis about the whole structure.The results show that the corrosion damage caused by local corrosion occurred is in 13th year under the selected corrosion parameters,no apparent signs before structural damage,the failure process and structural response time is very short and dangerous.
引文
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[3]刘威,李杰.考虑随机腐蚀作用的埋地管线地震反应分析[J].土木工程学报,2007,40(2):104-108.
[4]Oh Sei J,Cook D C,Townsent H E Saitoh.Atmospheric corrosion of different steels inmarine,rural and industrial environments[J].Corrosion Science,1999,41(16):1687-1702.
[5]Evens U R.Mechanism of rusting[J].Corrosion Science,1969,9(8):813-821.
[6]梁佶,林书明,陈春雷.钢结构的大气腐蚀模型[J].空间结构,2004,10(4):60-63.
[7]梁彩凤,侯文泰.碳钢、低合金钢16年大气暴露腐蚀研究[J].腐蚀科学与防护技术,2005,25(1):1-6.
[8]刘鸿文.材料力学[M].北京:高等教育出版社,1997.
[9]李元齐,沈祖炎.弧长控制类方法使用中若干问题的探讨与改进[J].计算力学学报,1998,15(4):414-422.
[10]尚晓江,邱峰,赵海峰,李文颖.ANSYS结构有限元高级分析方法与范例应用[M].北京:中国水利水电出版社,2006.
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