大直径复合绝缘子法兰节点抗震性能及设计参数影响研究

Study on Anti-seismic Performance and Influence of Design Parameters of Flange Joint of Large Diameter Composite Insulator

针对超、特高压大直径复合绝缘子法兰节点抗震性能及其设计参数影响的问题,建立基于内聚力材料的复合绝缘子法兰节点有限元模型,开展水平低周往复加载下的绝缘子抗弯性能和绝缘子管壁厚度、法兰高度及粘接强度等参数的抗震性能影响分析。分析结果表明:①增大复合绝缘子管壁厚度虽可以提升绝缘子结构的抗弯能力,但对绝缘子的滞回耗能特性影响不大;②增大法兰高度对绝缘子结构的抗弯能力提升不明显,但可以显著提升法兰节点的耗能能力,且过高的法兰高度会使法兰节点提前出现粘结裂缝;③提高法兰与绝缘子之间胶装材料的粘结强度可提升绝缘子线性抗弯刚度和非线性耗能能力,在相同加载控制位移下,粘结强度越大,复合绝缘子法兰节点的滞回耗能特性和抗震延性都得到了显著改善。

Aiming at the problems of anti-seismic performance of the flange joint of UHV and EHV large diameter composite insulator and the influence of its design parameters,a finite element model of flange joint of composite insulator based on cohesive material is established to analyze the influences of anti-seismic performances of anti-bending property of the insulator and the parameters including tube wall thickness,flange height,bonding strength,and so on under horizontal low cycle reciprocating loading.The analysis results show that it is able to improve the anti-bending capacity of the composite insulator by increasing its wall thickness,but has little effect on the hysteretic energy disspision of the insulator.Secondly,it dose not improve the anti-bending capacity of the insulator by increasing the flange height,but can improve the energy consumption capacity of flange joint significantly,and if the flange height is too high,it will lead to debonding cracks in the flange joint in advance.Thirdly,by increasing the bonding strength of the cementing materials between the flange and the insulator,it is able to promote the linear anti-bending stiffness and nonlinear energy dissipation capacity of the insulator.Under the same loading control displacement,the greater the bonding strength,the more significant the energy dissipation capacity of the composite insulator,and the anti-seismic ductility of the composite insulator will be greatly improved.