The Compressive Behavior And Ultimate Strength Of Gusset Plate Contacted With Single Angle

Gusset plate connections are commonly used in bridge trusses, heavy workshop and tower structures to transfer forces from one structural member to another. Due to the multiformity of these connection shapes and complexity of force transfer, it is extremely difficult to investigate the force transfer, breakage mechanism and ultimate carrying capacity of gusset plate. Because of the eccentricity of gusset plate contacted with single angle, the compressive behaviour of gusset plate must be different from other connections. Hence, taked some typical gusset plate connections of tower structure as object, a research program was initiated to investigate the compressive behaviour, modility and rule of breakage, and ultimate strength of gusset plate by full-scale testing and finite element analysis. The main works of this paper as follows:â‘ Two full-scale tset of gusset plate contacted with single angle was completed. And test result showed that the breakage mode of gusset plate was out-plate sway buckling. The weak position of gusset plate are the end of single angle connections plate. Because of the eccentricity between gusset plate and single angle, gusset plate had out-plate bend transfiguration by the impact of additional moment. At the same time, the transfiguration of gusset plate include distortion as the torsion effect of compressive gusset plate.â‘¡The finite element analysis of gusste plate contacted single angle were completed, and compared the finite element simulation result and full-scale test result. The analysis result showed that the compressive behavior of gusset plate are very consistent between ANSYS finite element analysis model and full-scale testing. And it is indicated that this finite element model exactly simulate the compressive behavior and carrying capacity.â‘¢The influence and rule was analysed for comporessive behavior of gusset plate with different parameter. It is showed that the ultimate compressive carrying capacity of gusset plate contacted with single angle increase along with the increase of thickness and decrease of supportless length of gusset plate, and the breakage mode translated from out-plate sway buckling to material intensity yielding at the same time. Because of the loading eccentricity and the influence of out-plane rigidity, the ultimate compressive carrying capacity of gusset plate decreased to just about 0.6 times compared with the gusset plate contacted with double angles. â‘£Compared the compressive carrying capacity with the formula calculated values in the existing steel structure norms at home and abroad, and checked the applicability of calculated compression capacity for gusset plate contacted with single angle in existing norms. It's showed that whatever the efficient width theory (Whitmore theory) which take material intensity fielding into account and the stabilization calculation formula(Thorndon theory) which take menber buckling into account, the formula in the existing steel structure norms couldn't calculate the real ultimate compressive carrying capacity of gusset plate exactly. Through the investigation of compressive behavior and ultimate strength of gusset plate by full-scale testing and finite element analysis, consulted a lot of research information, a calculation formula about compressive carrying capacity of gusset plate was summarized and suggested, and the advanced formula could exactly simulate the compressive carrying capacity of gusset plate contacted single angle and double angles.