Mechanical Properties Investigation Of Stainless Steel Uniplanar Welded Tubular Joints With Circular Chord And Square Branch

Stainless steel is becoming more and more popular in modern building structures because of its excellent durability and corrosion resistance;furthermore,it also has elegant appearance.The tubular stainless steel structure has the characteristics of light weight and low consumption of steel.The tubular joint is the mostly used in the links between the pipes.At the present,the study of tubular stainless steel joint is not very rich,and the calculation methods and design rules are referred to ordinary carbon steel.To some extent,those situations hinder the stainless steel structure application in the structural engineering.Based on the above background,this paper conducted the static performance of stainless steel uniplanar welded tubular X-,T-and Y-joints under axial compression.In this text,four types of joints are designed,and each type has four kinds of sections.Two specimens were repeated to verify the accuracy of the test measurement.Firstly,the tensile test of stainless steel material was carried out to obtain mechanical properties and provide material basis for the subsequent finite element analysis.Then the static test was conducted to 18 specimens of the tubular joint,some conclusions can be get as follows:(1)The failure modes,load-displacement curves and ultimate bearing capacities the specimens are obtained by static test of these 18 tubular joints.(2)Comparing the test results with the results calculated by current design specifications,it was expressed that the specifications are not very suitable for stainless steel tubular joint for the great discreteness of the results.(3)Finite element analysis software ABAQUS was used to conduct numerical simulation of stainless steel uniplanar welded tubular X-,T-and Y-joints.The accuracy of the numerical model was verified by comparing the numerical simulation results with experimental results,including failure modes,load-displacement curves and ultimate bearing capacities.(4)The verified numerical model was used to study how the parameters ?,2? and ? to influence the ultimate bearing capacity.? is the ratio of brace width to chord diameter;? is the angle between chord and brace;2? is the ratio of chord width to thickness.The ultimate bearing capacity of the simulation is compared with the result of the standard calculation to prove the applicability of the standard.