Research On Internal Force Distribution And Influencing Factors Of Main Structure Of Subway Station

The subway station is a long and narrow structure. It is usually using plane frame model to calculate the forced state. But due to the construction and use requirements in the subway station, there are many large holes on top and middle plate in the construction process, such as shield hole, stairs and escalator hole, track panel shaft etc. These holes weakened the one-way characteristic of plates seriously, and the calculation results according to the plane frame hypothesis have not meet the actual situation. Therefore, it is established the three-dimensional plate and shell model of subway station in the specific engineering using ABAQUS finite element software,then the force and influence factors of the subway station is to be analyzed. The main contents are as follows:It is established the space force model of the main structure in the subway station.The force characteristics of plates, walls and beams were studied in two different conditions(construction phase, normal phase) and the reasons for this result was analyzed in detail. The results show that there are some components in the most unfavorable state under the construction phase and also some in the most unfavorable state under the normal phase. It is not appropriate to design based on a single condition, it should comprehensive two conditions to find the most unfavorable state for each component.By several factors which influenced the internal forces distribution respectively, the force laws of main structure in the subway station was studied. These factors included the impact of the structure section stiffness(stiffness ratio of beam-slab, stiffness ratio of beam-column and stiffness ratio of slab-wall), the ground-environment(vertical bedding coefficient, horizontal bedding coefficient and coefficient of lateral earth pressure), and the load conditions(the additional pressure caused by the impact of buildings which around the station).Four kinds of supporting schemes using around the track panel shaft are numerically simulated. These strengthening schemes included by frame beam,frame beam +beam, frame beam + longitudinal beam and frame beam +beam + longitudinal beam. Contrasting with not taken any strengthening ways, the results of the stress and deformation are all improved through after taken the four strengthening ways.