Analysis of Seismic Effects and Anti-seismic Performance of Electrified Railway Catenary System
Research purposes:Electrified railways in areas with high seismic intensity pass through many seismic fault zones,the catenary system is prone to damage under the action of earthquakes,which can easily affect the normal operation of trains.This paper combined electrified railways in high seismic intensity areas and conducted full-scale shaking table tests on 4-column and 3-span prototypes based on the service characteristics of the overhead contact system.The finite element model of the overhead contact system under earthquake response was established and verified.The seismic response simulation calculation of the overhead contact system under earthquake action was carried out,and the seismic performance of key equipment such as overhead contact wire,cantilever,locator,and pillar was compared and analyzed.At the same time,the seismic performance of key equipment such as the catenary wires,cantilever,positioners,and poles were comparatively analyzed,and the impact of different working tensions,spans,and anchor lengths of the catenary wires on the seismic performance of the catenary system were compared and analyzed.Besides,the seismic design principles and measures of the catenary system in high seismic intensity areas were proposed,and the response rules and seismic performance of the catenary system under earthquake action were comprehensively analyzed and studied.The analysis data and research conclusions on the seismic performance of catenary systems proposed in this paper can effectively supplement and improve the seismic design specifications and standards of catenary systems,strongly support the construction of railway projects,and improve the disaster prevention and resilience capabilities of electrified railways.Research conclusions:(1)Seismic excitation has little impact on the catenary cantilever,and the positioner is stressed,causing the hook ring structure to easily fall off.(2)Seismic excitation has a very obvious impact on the catenary poles and contact wires,which can cause the poles to collapse,the bottom stress of poles increases and the mid-span displacement of the contact wire increases.(3)The length of the anchor section has no significant impact on the seismic performance.Appropriately increasing the working tension of the contact line and reducing the span can effectively reduce the seismic response of the catenary system.(4)The results of the research can provide guidance for the design of disaster prevention and reduction in the rail transit field.
万方数据
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