Research On Seismic Behavior Of Large Space Underground Parking Garage In Rail Transit

Metro city modernization transportation, make it greatly reduced the amplitude produced during an earthquake. However, in recent years, earthquake damage has shown that earthquake can also bring serious harm to underground structure, the seismic performance of underground structure still need to be further researched.This paper has carried out the following work:(1) By referring to the related data of Xiamen underground parking lot, this paper use ABAQUS software to simulate the effects of seismic wave propagation in the structure.Two-dimensional and three-dimensional structure models are set up respectively, adapting the method of dynamic and time-historical analysis, consider the problem of dynamic response of underground structures under seismic activity, in order to explore the the seismic performance of shallow underground structure.(2) This article through to the underground parking lot of model for dynamic damage analysis, determine the weak parts and damage form.(3) Under horizontal earthquake action, the weak link of underground structure are as follows:in the column, floor and roof and side wall and roof, floor and weak parts of the structure in the bottom position internal force should be greater than the internal force of location with roof; In the design of the structure, the weak link of steel bar is encrypted, plus axillary nodes and other measures to enhance the underground structure seismic intensity. (4) With the increase of buried depth structure, under the action of horizontal earthquake, along with the increase of the relative displacement in underground structures, underground structure wall plate junction, the stress of the plate column junction are also increased significantly, should set the isolation device to increase its ductility to ensure the safety of the structure;(5) With the increase of elastic modulus of surrounding rock, underground parking structure under the action of horizontal earthquake, the structure of the horizontal displacement and stress are reduced, visible around the structure to reinforce soft soil layer, is conducive to the earthquake.