Pinnacle Silo Type Underground Parking Garage Under Complex Conditions Study Of Force Characteristics

As China’s urbanisation and modernisation process continues to advance the problem of difficult parking becomes increasingly prominent,how to develop and expand parking space in the context of tight land resources in cities and towns is particularly important.The silo type underground parking garage has better safety and high space utilization,which is the development direction of urban underground garage,but the high complexity of silo type underground parking garage project,the understanding of its internal force characteristics and deformation traits has not yet mature theoretical research,which limits its promotion and application.This thesis conducts similar ratio model tests based on a silo-type underground parking garage project in Shijiazhuang,and uses the finite element software MIDAS GTS to establish a three-dimensional model to verify the accuracy of the tests and su mmarise the relevant laws of internal forces and deformation characteristics,which is of great practical significance for guiding the design and construction of silo-type underground garages.The conclusions of the research in this thesis are as follows:(1)Firstly,the types of silo-type underground parking garages and their advantages and disadvantages are su mmarised,and the concept,structural form and construction method of silo-type underground parking garages are elaborated.It can be seen that the structural form of silo-type underground parking garages is quite different from traditional underground parking garages,which can effectively utilise urban underground space and parking area,and the silo-type enclosure structure makes more efficient use of the compressive properties of concrete.(2)A silo-type underground parking garage model test was carried out based on a pintle-shaped silo-type underground parking garage project in Shijiazhuang.Using similar ratios to derive similar relationships,the excavated soil and enclosure structure ratios were tested to arrive at a set of ratios closer to the target value,and a model test of 1:80 was carried out.The variation rules of the moment of the enclosure structure,lateral earth pressure and displacement at the top of the enclosure structure were obtained.(3)Based on the project,a three-dimensional numerical model of the underground parking garage in a zigzag silo was established using MIDAS GTS to analyse the force and deformation characteristics of the enclosure structure and the influence on the surrounding soil under different construction conditions.(4)Comparison of the cyclic stress variation patterns in silo-type enclosure walls obtained from numerical simulations and model tests demonstrates the feasibility of the two research methods.