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由于较高的强度质量比和刚度质量比,加肋钢板在航空结构、船体结构、海洋采油平台及闸门中得到广泛应用,然而其开口和初始缺陷对加肋钢板的强度和稳定性有较大的影响。通过研究在轴向和面外荷载作用下加肋钢板的破坏性能并追溯过峰性能,制作并完成了4个带方形开口的加肋板的试验。采用角钢作为加劲肋,测量钢板的缺陷、加肋板整体的缺陷及刚度,对所有的加肋板进行试验直至破坏。建立了带有初始缺陷的加肋板有限元模型并通过试验结果进行验证。采用该有限元模型进行参数研究,形成了相关曲线和方程并用于带有初始缺陷和开口的加肋板的设计。在恒定的面外荷载下,方形开口加肋板与极限轴向承载力的相互影响呈线性关系,轴向极限承载力成比例减小。
Due to the high strength-mass ratio and stiffness-mass ratio, ribbed steel plates are widely used in aeronautical structures, hull structures, offshore oil platforms and gates, however, their openings and initial imperfections have a greater impact on the strength and stability of ribbed steel plates Impact. By testing the failure performance of ribbed steel under axial and out-of-plane loads and tracing the peak performance, four panels with square openings were fabricated and completed. The use of angle steel as a stiffener to measure the defects of the steel plate, plus the overall defect of the rib plate and the rigidity of all the ribbed plates until the test is carried out. The finite element model of stiffened plate with initial defects was established and verified by the test results. The finite element model was used to study the parameters, and the related curves and equations were formed and used to design the ribbed plate with initial defects and openings. Under the constant out-of-plane load, the interaction between square opening and ribbed plate and ultimate axial bearing capacity has a linear relationship, and the axial ultimate bearing capacity decreases proportionally.