随机点锈蚀下圆形钢管轴压承载能力

Axial Bearing Capacity of Circular Steel Pipes with Random Pitting Corrosion

摘要:

针对随机点锈蚀对圆形钢管轴压承载能力的影响，以质量损失率为因变量，研究轴压承载力在随机点锈蚀影响下随质量损失率的变化规律。通过引入轴压承载力折减系数，揭示了锈蚀深度、锈蚀坑平面尺寸、钢材等级以及钢管壁厚对折减系数的影响规律。在大量随机有限元分析的基础上，提出了折减系数的理论计算公式。该公式可根据质量损失率精确预测钢管在随机点锈蚀影响下钢管轴压承载力的折减系数。

Abstract:

In view of the effect of random pitting corrosion on axial bearing capacity of circular steel pipes， the changing rule of bearing capacity was revealed along with the mass loss ratio. A reduction factor was introduced to investigate the effect of corrosion thickness， pitting size， steel grade and wall thickness of steel pipes. The analytical formula for predicting the reduction factor was proposed. This formula can exactly predict the reduction factor of corroded steel pipes which is affected by random pitting corrosion.