点蚀孔腐蚀钢构件力学性能劣化简化分析方法

发布时间：2018-06-30 09:13

本文选题：钢构件 + 腐蚀　；参考：《哈尔滨工业大学学报》2016年12期

【摘要】：点蚀是一种局部和剧烈的腐蚀形态,导致钢结构构件力学性能退化,突然之间发生事故,对结构整体造成安全隐患.本文针对具有点蚀孔腐蚀特征的钢构件,提出一种通过等效弹性模量定量评价其力学性能劣化程度的简化分析方法.依据周期喷雾复合试验数据,以锈蚀率和最大点蚀深度为基础,对点蚀孔深度、直径及分布情况作出适当假定;考虑涂层寿命的影响,以锈蚀率相等为原则建立人工加速腐蚀试验和海洋大气条件下Q235钢构件腐蚀情况的转换关系.建立考虑点蚀影响的有限元构件模型,通过轴向均布力作用下的构件变形确定海洋大气环境不同暴露时间下点蚀构件的等效弹性模量,提出点蚀构件力学性能劣化分析的实用计算方法.数值算例验证了上述采用等效弹性模量分析腐蚀构件受力性能方法的正确性;计算结果表明,在相同锈蚀率条件下,点蚀构件的等效弹性模量低于均匀腐蚀构件.
[Abstract]:Pitting is a kind of local and severe corrosion form, which results in the degradation of mechanical properties of steel structural members and sudden accidents, which cause hidden danger to the whole structure. In this paper, a simplified analysis method is proposed to quantitatively evaluate the deterioration of mechanical properties of steel members with pitting corrosion characteristics by means of equivalent elastic modulus. According to the data of periodic spray composite test, based on corrosion rate and maximum pitting depth, the pitting hole depth, diameter and distribution are properly assumed, and the influence of coating life is considered. Based on the principle of equal corrosion rate, the conversion relationship between the accelerated corrosion test and the corrosion of Q235 steel members under oceanic and atmospheric conditions was established. A finite element model considering the effect of pitting corrosion is established, and the equivalent elastic modulus of the pitting member under different exposure time is determined by the deformation of the member under the action of axial uniform force. A practical calculation method for mechanical property deterioration analysis of pitting member is presented. The numerical results show that the equivalent elastic modulus of the pitting member is lower than that of the uniformly corroded member under the same corrosion rate.
【作者单位】：混凝土及预应力混凝土结构教育部重点实验室(东南大学);北京工业大学建筑工程学院;
【基金】：国家杰出青年科学基金(51125031)
【分类号】：TU511.3

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