Second-Order Elastic Analysis For OCS Portal Structure

OCS is the most directly overhead equipment related to the high-speed railway operations. In recent years, it is widely used on the railway especially in the Railway Station Road. Therefore, it can be called door type or hard rigid centenary overhead beam system. With the rapid development of high-speed railway, it has been gradually developed into a centenary support structure of the main application form. However, because of the field in the centenary late start, the research and the use of OCS are relatively backward, and the analysis of its structure is still stay in the first-order elastic stage. Therefore, the results of this analysis often do not accurately reflect the true structure internal forces. And study of OCS at home and abroad, the second-order elastic analysis is still in the blank; therefore, the second-order elastic analysis of their research study has important theoretical significance and practical engineering application.Wind load is the main control load of the structure at work. Now there is few information with the second-order elastic analysis about OCS. And the current study for large wind loads are for bridges, housing, and the structure of the station and other projects, for the OCS portal structure, because of its larger span, under normal operating conditions, there are several factors have a greater impact on the structure of its internal forces such as beam-column linear stiffness and initial geometric impertections. This article has very important theoretical significance on the future design of the OCS portal structure.This article based on the working conditions of the OCS, applying analytical method and three-dimensional finite element method considering synergies of the structure and claims of the principles of structural analysis, analysising and discussing the structure under weight and wind loads, ideal structure and the structure account of initial geometric imperfections of the 21m,26m,31m,36m and 41m, the stress mechanism and the changes of internal force of five spans; On this basis, researching factors such as changes in lateral stiffness, which affect the mechanical behavior of the structure, obtained the conditions which needs to account of defect and the theory of computation and design method, providing the theoretical basis for the structure to be advanced technology,economic rationality,security and applicable.