Analysis Of The Ultimate Strength Of Diamond Bird-beak SHS K-joints

Square Hollow Sections are more and more widely used in engineering due totheir favorable structural behavior. K-type joint is normal in structural engineering. Thediamond bird-beak K joint is achieved by rotating the chord and brace of a traditionalK joint through45°about their longitudinal axes. There are a lot of researches abouttraditional K joint, but a little about diamond bird-beak K joint. There is no formulaabout the static resistance of the diamond bird-beak K joint which limit the applicationof this joint. This paper describes a rather complete finite element examination of theresistance of gapped diamond bird-beak k-joints under axial brace compression. Someconclusions are found for engineering design.The main research contents as follows:(1) Two force forms are considered in this paper: chord without axial load andchord with axial load. This paper describes the failure mode of the typical joint. Theinfluences of geometric parameters on the load-displacement relationship ultimatestrength, failure mode are investigated.(2) Joint ultimate strength with the variation of different load on chord is exploredfor different values of geometric parameters.(3) The different strength between traditional K joint and diamond bird-beak Kjoint is compared. The range of geometric parameters is concluded when the diamondbird-beak K joint is superior to the traditional joint.(4) With the results of FEM modes, an accurate and versatile regression formula is proposed.