不同锈蚀程度下栓钉连接件的抗剪性能分析

Analysis of shear resistance of stud connectors under different levels of corrosion

为研究栓钉连接件锈蚀条件下的抗剪性能退化规律,建立ABAQUS有限元模型进行数值模拟.针对均匀圆环、受压区半环、受拉区半环及拉压区半环4种不同的锈蚀分布形态,考虑不同的锈蚀高度、锈蚀深度进行数值分析.结果表明,当锈蚀深度相同时,4种锈蚀分布形态的栓钉抗剪承载力随锈蚀高度的增加而降低,在锈蚀高度为10 mm时降到最小,且锈蚀深度越大,承载力降低程度也越大;当锈蚀高度相同时,随着锈蚀深度的增加,抗剪承载力和抗剪刚度基本上呈线性下降趋势;当锈蚀高度和深度相同时,均匀圆环锈蚀的抗剪承载力和刚度的降低程度最大,相比其他3种情况降低60%左右,受压区半环锈蚀的抗剪承载力和刚度的降低程度最小.研究成果可为钢混组合结构栓钉连接件耐久性设计提供参考.

To study the degradation patterns of shear resistance of stud connectors under corrosion conditions,an ABAQUS finite element model was established for numerical simulation.Four different corrosion distribution patterns,namely,uniform annulus,compressive zone semi-annulus,tensile zone semi-annulus,and tensilecompressive zone semi-annulus,were considered.Numerical analyses were carried out for different corrosion heights(CH)and depths.The results show that when the corrosion depth(CD)is constant,the shear bearing capacity decreases with the increase of CH,reaching its minimum at a CH of 10 mm.Moreover,the greater the CD,the greater the degree of reduction.When the CH is constant,the shear capacity and stiffness decrease linearly with the increase of CD.Under the conditions of equal CH and CD of the studs,the reduction of shear capacity and stiffness of uniform annulus corrosion is the largest,which is about 60%lower than the other three situations,while the smallest reduction occurs in the studs with compressive zone semi-annulus corrosion.The research results can provide reference for the durability design of stud connectors in steel-concrete composite structures.