Analysis And Research On Variation Nature Of Internal Force Of Subway Underground Station Main Structure

Aiming at the limitation of two dimensions simplified method in subway station structuredesign at present, and law of variation about internal force of station structure with various factorschange remained to be further discussion and analysis, in this paper, we took Gangxia NorthStation of Shenzhen Metro as an example, and studied on stress characteristics of station mainstructure in the construction and normal use stage conditions, and at the same time analysed thedistribution law of internal force of subway station main structure under the most unfavorableconditions from the changes about stiffness of structure section and environment of rock and soilby establishing the space finite element model of main structure about station standard section.The results as follows:(1) all slabs of station could bear two-way positive bending moment, andthe side walls born one-way force obviously, and the normal use stage condition was moredisadvantageous condition.(2) With the stiffness ratio of beam-slab increases, the transversemaximum bending moment of all slabs were reduced, the transverse maximum positive bendingmoment of the side wall increased, the maximum bending moment of beams of all slabs increased,the maximum axial force of the column was reduced.(3) With the stiffness of beam-columnincreased, the maximum bending moment and the maximum shear force of all beams and themaximum axial force of the column appeared to increase first, and then decreased or remainedunchanged, but mainly to increase.(4) With the elastic resistance coefficient increased, thetransverse maximum negative bending moment of the top and medium slab, and the transversemaximum positive bending moment of the side walls increased, the transverse maximum positivebending moment of the bottom slab and the transverse maximum negative bending moment of theside walls, and the maximum bending moment of beams of the bottom slab, and the maximumaxial force of columns were reduced.(5) With coefficient of static earth pressure increased, thetransverse maximum positive bending moment of all slabs were reduced, the transverse maximumnegative bending moment of all slabs and the transverse maximum bending moment increased.The calculation results of this paper show that the spatial effect of structure which can avoidignoring synergistic force action of all structural components and the hole of the medium slabshould be considered when the structural internal force of subway station is analysed, it shouldsimultaneously be considered the effect of different factors on the internal force of the stationmain structure. It will make sure that the internal force results of structure accord with actualsituation in this way. The research results have certain reference value in the similar engineeringdesign.