Theoretical Design Of Limit State And Calculation Platform Development For Pile-slab Structure Of Railway Subgrade

In this paper,the limit theory design method is applied to the calculation of pile-plate structure.Through extensive reading of the literature,the theoretical calculation model of the limit state of the pile-plate structure is proposed,the structural characteristics and design loads of the pile-plate structure are analyzed,and the related design theory is discussed.With the design method,the "stiffness method" and "foundation coefficient method" are used to solve the structural internal force of the plane rod mechanical model,and the limit state equation of the pile plate structure is established.The ABAQUS finite element simulation,theoretical calculation and ABAQUS numerical simulation results are used.The degree of similarity reached 0.9993,which verified that the established calculation theory was effective and reliable.Through the internal force analysis of the pile-plate structure,it was found that the mid-span position of the pile-plate,the pile-plate connection and the upper part of the pile foundation are areas of greater stress,especially the joint of pile and plate.Using the object-oriented C # programming language,a visual computing platform for pile-plate structure based on limit state method was compiled.By comparing the actual engineering design based on the allowable stress method,the rationality of the limit state theory design method and the economics of the design of the railway roadbed pile-plate structure are better verified.Through reading a large number of literature and existing engineering cases,the most common construction technology,construction plan and construction precautions for pile-plate subgrade structure are proposed.Finally,through orthogonal design,the parameters under different combinations can be determined.According to the corresponding combination plan,the appropriate indicators are selected.The selected indicators mainly include: the maximum bending moment in the span,the maximum bending moment and vertical force at the pile top,and the amount of reinforced concrete.Using the orthogonal table combined with AHP and gray correlation comprehensive evaluation method gives the recommended value of the pile board structure parameters under the main premise of economy or technology..