铁路电气化接触网硬横跨的力学性能分析研究

Analysis and Research on Mechanical Properties of Portal Structure of Railway Electrified Catenary

研究硬横跨这一铁路电气化接触网的关键设施,对分析其力学性能具有重要意义。本文对硬横跨建立了力学模型,用一阶弹性分析法和二阶弹性分析法,计算并验证了硬横跨的弯矩和集中力。结果表明,随着跨距增大,硬横跨各点处的内力呈增大趋势,其中立柱与横梁的接点处表现最为明显;两种弹性分析法得到的力学性能变化规律具有一致性;二阶弹性分析法得到的数据比一阶弹性分析法得到的数据略大,更符合硬横跨的实际受力情况。

It is of great significance to study the portal structure for analyzing its mechanical properties, which is the key facilities of the railway electrified catenary. In this paper, the mechanical model of portal structure is established, and the bending moment and concentrated force of portal structure are calculated and verified by the first-order elastic analysis method and the second-order elastic analysis method. The results show that the internal force at each point of portal structure tends to increase with the increase of span, especially at the joint of pillar and beam is the most obvious;the change laws of mechanical properties obtained by the two elastic analysis methods are consistent;the data obtained by the second order elastic analysis method is slightly larger than that obtained by the first order elastic analysis method, which is more in line with actual stress situation of the portal structure.