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分别利用弹簧单元和大面积梁单元模拟节点轴向刚度和节点域,建立轴向半刚性节点结构的数值分析模型,考虑几何非线性和初始缺陷的影响,进行承载全过程跟踪分析,研究节点轴向刚度对结构静力稳定性、内力和位移的影响。结果表明:轴向刚度对结构影响较大,随着轴向刚度增大,稳定承载力随之增大,杆件内力分布趋于均匀,结构位移减小。进而研究了常用焊接球轴向半刚性节点结构的静力性能。结果显示:考虑实际节点轴向刚度后,稳定极限承载力比节点轴向刚性最大降低30.4%,最大挠度增大16.9%,可见节点刚接或是铰接则过高估计了结构的性能,但经计算发现轴向半刚性节点结构仍然满足设计要求。
The numerical analysis model of the axial semi-rigid node structure is established by using the spring element and the large-area beam element to simulate the axial stiffness and node domain of the node respectively. Considering the influence of geometric nonlinearity and initial defect, the whole bearing process is analyzed and tracked. Effect of Stiffness on Static Stability, Internal Force and Displacement of Structures. The results show that the axial stiffness has a great influence on the structure. As the axial stiffness increases, the bearing capacity increases, and the internal force distribution of the rod tends to be uniform and the displacement of the structure decreases. Then the static performance of the common semi-rigid axial joint structure of welded balls is studied. The results show that, considering the actual stiffness of the joint, the ultimate ultimate bearing capacity decreases by 30.4% and the maximum deflection increases by 16.4% compared with the axial stiffness of the joint. It can be seen that the structural performance of the joint is too high when the joint is rigid or hinged, The calculation shows that the axial semi-rigid node structure still meets the design requirements.