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根据腐蚀的腹板和腹板边界条件,对局部腐蚀腹板的剪切屈曲性能和剪切破坏模式进行了非线性有限元分析。定量地评估腐蚀腹板的剪切屈曲性能时,考虑了腹板的纵向腐蚀和三角形腐蚀。对于纵向腐蚀的腹板,取决于其腐蚀条件以及边界条件,其剪切屈曲强度仅减少约9%~16%。腹板的斜拉应力扩展、逐渐变得扭曲,出现明显的剪切-屈曲形状。特别地,在腹板-翼缘分开的边界条件下,出现平面外位移,变形表现出不同的剪切屈曲模态,例如,上部出现斜拉应力、下部出现较大的三角形横向位移。另一方面,三角形腐蚀对腐蚀腹板的剪切屈曲抗力影响甚微,因为这种腐蚀模型不影响腹板的斜拉应力。
According to the corroded web and web boundary conditions, the nonlinear finite element analysis of the shear buckling behavior and shear failure mode of locally corroded webs is carried out. When quantitatively evaluating the shear buckling behavior of corroded webs, longitudinal and triangular corrosion of the webs are considered. For longitudinally eroded webs, the shear buckling strength is reduced by only about 9% to 16% depending on their corrosion conditions and boundary conditions. The diagonal tensile stress of the web expands and gradually becomes distorted, with a pronounced shear-buckling shape. In particular, under the boundary condition of web-flange separation, there is an out-of-plane displacement, and the deformation shows different modes of shear buckling. For example, diagonal tensile stress appears in the upper part and larger triangular displacement in the lower part. On the other hand, the triangular corrosion has little effect on the shear buckling resistance of the corrosion web because this corrosion model does not affect the web’s diagonal tensile stress.