Comparative Research On Bearing Capacity And Stiffness Of Throughout Plate Joint To Hollow Section

The main content of this paper include two parts: research on the ultimate bearing capacity and bending stiffness of tube-plate joint pre and post strengthened; practicalcalculation formula regression.Tube plate joint due to its convenient construction, low cost and good mechanicalproperties is widely used in large span roof trusses, transmission tower, aero plane hangar, and other structures. With the increasing span of spatial structures, bearing capacity and anti-deformation ability of the nodes were also put forward higher requirements.This paper describes the stiffening measures commonly used in engineering, and in-depth analysis throughout plate to hollow section joint which have been studied abroad. This approach connect two side walls of the tube as a whole to resistance force and deformation, the stress transfer to the lower part of the competent, similar to joist steel power transmission mode. Furthermore, this type of node can be greatly strengthened on the basis of the tube plate joint just after cutting and welding. However, dueto the lack of relevant experiment and theoretical formula, it is not common in actual project. In this paper, Abaqus finite element software is used for numerical simulation. By simulate and verify the similar experiments to Packer’s, 44 tube-plate T-joints and 152K-joints finite element models of familiar dimension have been found and analysis in this paper. Varying the geometric parameters T, L, tp,,R and stress ratio of main tube μ and other parameters, analyze variation of failure mode, bearing capacity, bending stiffness in T and K-tube plate joint pre and post strengthened, and proposed reasonable suggestion.The proposed strengthen measure has greatly improved ultimate bearing capacity and bending stiffness of local buckling failure model joints. But not obvious to plate or branch tube failure model joints. ignore initial defects, weld residual stress, and the strengthening of weld, bearing capacity and the resistance to deformation of T, K-joints enhanced are greatly improved, and overcome damage of excessive deformation in main tube, more reasonable mechanism of force transmission improve materials utilization rate. However, some joints with weak plate remains plate damage after strengthened may decrease a little in bearing capacity should be attention, a is the most influence factor to bearing capacity pre stiffening of K joint, while as the gusset strengthened,γ become the most influence factor. Stress ratio of main tube is an important factor, bearing capacity decrease with the increase of tension of main tube, while increase with lower compression level, but decrease if it keeps increasing, choose right strengthenmethod under different circumstances.Finally, based on the finite element results, the factor ξ which measure the improvement of the bearing capacity of tube-plate T-joint is put forward. Regression ultimate bearing capacity calculation formula of tube-plate K-joint pre and post strengthened by least square method. And gives the scope for application.Summary nodes performance obtained by numerical simulation and verify the feasibility of such a strengthened method provide reference for further experimental studiesand in-depth research.