Response Analysis Of OCS Portal Structure Under Wind Load

OCS is the most directly correlative overhead equipments for the high-speed railway operate. It makes up by parts of contact hanging supporting structure and load-carrying cable etc. By the development of high-speed railway, the portal structure has gradually become develop trend for OCS supporting structure. Because the environment is special, OCS portal structure has become one of the weakest links in all the traction current supply system.Wind load is the principal control load for portal structure normal work, domestic and foreign research on OCS generally focuses on the pantograph-OCS quality of current collection and hanging system, but the research on OCS portal structure is less. Present the design for portal structure, the choose of correlation calculated parameter isn't canonical; the simplified portal structure makes the computational error increment. So, the systematic and exact research on the response which the portal structure under the wind load is very necessary.This article is based on the finite element theory,considered on structure system work corporately,establish the three-dimensional model of portal structure-cable which combined action. Utilize the sub-space iterative method to analyze the power character of structure, and through compare the different parameter to the effect of structure auto oscillation, provide the gist for the structure whether consider the effect of fluctuating wind.Based on it, analyse the response which under the different design wind speed for the portal structure, individual consideration the effect of alteration of load-carrying cable, tensile force, different wind angle, different joint mode for the response which under wind load for the portal structure. Analyse which is the chief factor for effect the wind resistance capability. So provide the basement for proper effective, design of wind resistance for the portal structure. While, analyse the effect ice-coating under the wind load for the portal structure, find ice-load impact on structure performance of wind reistance obviously and should be priority considered in design.Found on the improved load increment method, bring forward analyse method of portal structure integral stability with ansys, according to 41m eight tracks portal structure,integral stability of structure with wind load be analysed and safety coefficient be confirmed.