钢管塔环型加肋空间节点抗弯性能分析

Analysis of Bending Performance of Multiplanar Steel Tubular Connection with Annular Ribbed Plate for Transmission Towers

为考察钢管环型加肋空间节点的破坏模式和抗弯性能,进行了静力加载试验和有限元数值分析.研究结果表明,节点具有主管局部屈曲和局部横向塑性变形两种破坏模式,且主管屈曲破坏与主管应力相关,主管横向塑性变形由环板及主管组成的环板-主管模型控制.针对两种破坏模式,利用塑性理论和有限元参数分析及回归分析方法分别提出节点抗弯承载力的建议公式.建议公式与试验数据进行比较,结果表明,建议公式合理有效,可为类似节点设计提供参考.

A static experiment test and finite element numerical simulation method were carried out to investigate the failure modes and bending performance of multi-planar steel tubular connection with annular ribbed plate.Local axial buckling and transverse plastic deformation failures on such connections were observed from these studies. The local buckling depended on the stress on the chord and the plastic deformation was related to the annular ribbed plate-to-chord model comprised by the annular ribbed plate and a section of chord.For the two failure modes,plastic theory,finite element parametric study and regression analysis were used to develop the proposed formulas of ultimate bending moments for such connections.The proposed formulas were compared with that from experimentations and the results show that the formulas have practical significance and could provide references for the design of similar connections.