The Analysis Of Square Bird-beak SHS Joint Subject To In-plane Bending Moment

At present,steel tubular structures are widely applied in structural engineering in China,and have obtained significant benefits on economy and technology,such as large-span building,bridges and lattice masts.Through the test,it is indicated that not only the strength of square bird-beak SHS joint is higher than the corresponding square conventional tube,but also have a higher strength than pipe joint with a similar cross-section.Because of the beautiful appearance and characteristic meeting the needs of the special structure,the joint is popular applied in the structure by the engineers. Therefore,there are very important theoretical and practical value on study and analysis of the square bird-beak SHS joint.The non-linear finite element analysis is carded out on the square bird-beak SHS joint.Compared with the test data,the calculated results are better consistent with it. Furthermore,the factors,such as material nonlinearity and geometric nonlinearity,are considered to analyze the effect on the plane flexural capacity of bird-beak SHS joint. The conclusions could be obtained as following:first,some factors have great influence on the plan flexural capacity,including brace diameter to chord width ratioβ,chord width to chord wall thickness ratio 2γ,and brace wall thickness to chord wall thickness ratioτ,etc.The ultimate flexural capacity of joint increases as theβincreased,while increases as the 2γandτdecrease.The effect of yield strength on bearing capacity is significant,that is,the limit moment of node increases with the yield strength increases. Finally,some useful conclusions are suggested for construction projects.