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建立弹塑性有限元模型,对大直径螺栓球节点试验中容易破坏的锥头进行数值计算,试验结果验证了有限元模型的适用性。考虑了影响锥头承载力的各种主要因素,进行了相应的参数分析。揭示了大直径锥头具有底板壁厚塑性贯通、锥壳壁厚塑性贯通和局部承压破坏等三种破坏模式,掌握了螺栓直径d、钢管直径D5以及有关锥头的径向厚度t、底板厚度H、锥头斜率k、底板受荷面积比S等各种几何参数对锥头承载力的影响效应。基于多元回归分析,提出了大直径锥头前两种破坏模式的承载力计算式。与试验结果相比,计算式较为准确可靠,可应用于工程设计。
The elasto-plastic finite element model is established, and the easily disrupted cone head in large-diameter bolt-ball joint is numerically calculated. The experimental results verify the applicability of the finite element model. The main factors affecting the bearing capacity of cone head are considered, and the corresponding parameter analysis is carried out. Reveals that the large-diameter conical head has three kinds of failure modes, namely, the plastic thickness of the floor, the plastic thickness of the conical shell wall, and the partial pressure failure. The diameter d of the steel pipe, the diameter of the steel pipe D5 and the radial thickness t of the conical head are obtained. Thickness H, the slope of the cone k, floor area ratio S and other geometric parameters on the bearing capacity of the cone. Based on multivariate regression analysis, the formula of bearing capacity of the first two kinds of failure modes with large diameter cone is proposed. Compared with the test results, the calculation formula is more accurate and reliable and can be applied to engineering design.