本文首先对Q345级H型钢柱进行了轴压试验。然后,在理论推导的基础上,提出了点蚀后的H型钢柱在轴压作用下的极限强度损失计算方法,并采用数值模拟对所提公式进行了验证。进一步考虑随机点蚀的尺寸和位置对柱强度损失的影响。首先研究了单个点蚀坑对柱强度损失的影响,建立了点蚀坑的贡献函数。然后考虑点蚀坑的相对大小、距离和角度,通过相互作用系数来反映点蚀坑之间的相互作用效应。最后,建立了一组考虑点蚀坑随机性的有限元模型,进一步验证了所提计算方法的可行性。

In this paper, axial compression tests were firstly performed on Q345 grade H-shaped steel columns. Based on systematic theoretical deduction, a computational method was then presented to evaluate the ultimate strength loss of the pitted steel column with H-section under axial compression. The detailed formulas were calibrated by numerical simulations, and the random pitting size and locations were both considered. The influence of a single pit on the column strength loss was firstly investigated, and the contribution function of a single pit was established. Then the interaction effects between pits were investigated by considering the relative size, distance, and angle of the pits, reflected by the interaction coefficient. A family of finite element models with consideration of the randomness of corrosion pits were built to validate the feasibility of the proposed computational method.