Anlysis And Numerical Simulation Of Mechanical Characteristics Of Arched Soil-covered Frpsandwiched Culvert Structure

Most of the highway culverts are cast with reinforced concrete materials.The long construction period,cracks and other early diseases,poor corrosion resistance,high comprehensive costs and other shortcomings increase their construction and maintenance costs.The glass fiber reinforced plastic sandwich structure has good corrosion resistance,simple and fast construction,and low maintenance costs,which makes it have good development potential in highway culverts.In addition,prefabricated culverts have always been the structural form dreamed of by traffic builders.The prefabricated glass fiber reinforced plastic sandwich structure is embedded in the straight concrete walls on both sides to become the top structure of prefabricated culverts and passages.This prefabricated composite structure is feasible.In view of the new FRP sand sandwich composite structure,due to the lack of sufficient understanding of the stress and deformation performance of buried FRP sand sandwich arch structure,it is urgent to systematically carry out the mechanical performance of the interaction between arch FRP sand sandwich structure and soil.The research provides effective basis for design and guarantees the safety and reliability of the engineering application of new fabricated composite structures,which has great engineering significance.In this paper,the design theory of arched glass fiber reinforced plastic sandwich structure in highway culverts is far behind engineering practice,and the lack of structural analysis and calculation methods for the mechanical properties of materials.This article takes arched glass fiber reinforced plastic sandwich structure as research object.The test explores the mechanical performance of the structure under the load and the factors that affect the structural force.The reliability of the indoor test was verified by numerical analysis.On this basis,the load reduction was carried out for the unfavorable working conditions of the structure,and the optimal parameters for the load reduction of the geogrid were determined,which provided an important reference for its mechanical performance evaluation and design.in accordance with.The main research aspects of the paper are as follows:(1)Test the compression performance and tensile performance of the arched FRP sandwich structure to obtain the compressive strength and tensile strength of the pipe culvert.With this as a standard,laboratory tests were conducted on the FRP sandwich structure to investigate its mechanical properties and deformation laws,and the influence of load level,soil cover thickness,and span-to-span ratio on the force of the arch structure was analyzed.(2)Taking the indoor test as a prototype,the ABAQUS finite element simulation is used to establish an arched glass fiber reinforced plastic sandwich structure model,and the simulation calculation results are compared with the indoor test results to verify the accuracy of the finite element analysis.(3)Factors such as mountains,heavy traffic,and shallow overburden may be affected on the basis of the indoor scale experiment,which may have a certain impact on the arched FRP sand structure.To improve the safety factor,avoid plastic damage to the structure and surrounding soil In the most unfavorable working conditions,the grid is laid to reduce the load,and the parameters and values of the grid are determined by numerical simulation to meet the needs of the project.