Study On Mechanical Properties And Stability Of A New Type Of Disk-Buckle Lattice Support

The bracket structure is an important part of bridge construction.The traditional fastener bracket and bowl buckle bracket can no longer meet the current needs of bridge construction.The disc buckle bracket has the advantages of stable force,convenient assembly,and good economy,and has become the current mainstream bracket.In order to better utilize the advantages of the buckle bracket,a new type of buckle lattice bracket is proposed based on the innovation of the buckle bracket structure,which is cumbersome and cannot effectively utilize the material strength and occupy a large amount of construction space.The load-bearing performance and stability of the buckle type lattice support are the main factors affecting its structural application safety.However,there is currently insufficient research on the buckle type lattice support,which affects its safety and promotion in engineering applications.In this paper,the mechanical properties and stability of the coiled lattice support were studied.The main contents are as follows:(1)Research on the buckle type lattice support node.The buckle type lattice support node is a semi rigid connection,which has a significant impact on the stable bearing capacity of the support.This article conducted vertical shear,horizontal shear,and bending tests on the buckle nodes,obtained the load deformation relationship and node failure phenomenon of the buckle nodes,studied the semi rigid characteristics of the nodes,and analyzed the reasons for this phenomenon.A finite element model of the buckle entity was established using ABAQUS software,and the correctness of the experiment and model was verified using the node load deformation relationship as an indicator.Using a trilinear model and a two parameter logarithmic model,the node load deformation curve was fitted to obtain the node stiffness value and its value range.(2)Research on the mechanical properties of the buckle type lattice support.This article designs and conducts a lattice support compression test to test the load,displacement,and stress changes of the support,and obtain the load-displacement,load-stress relationship curves of the support during the test process,as well as the ultimate bearing capacity and failure form of the lattice support.Using ABAQUS software to establish a finite element model for ballast testing,the initial structural defects and node stiffness values were introduced to simulate the test conditions,and the ultimate bearing capacity and buckling mode of nonlinear buckling of the lattice support were simulated.The accuracy of the established finite element model was verified using the ultimate bearing capacity and buckling mode of the lattice support as indicators.(3)Research on the factors affecting the load-bearing performance and stability of the buckle type lattice support.Based on the finite element model established by the ballasting test,the variable parameter analysis of the factors affecting the stability bearing capacity of the lattice support was carried out.The design expert software was used to introduce the response surface method to fit the variable parameter simulation results of the lattice support,and the stable bearing capacity expression of the lattice support without slant support was obtained.The accuracy of the expression was verified by the test results.