Study On Performance Of Joint Between Rectangle Tube Steel Column And H-Shape Steel Beam

The rectangle steel tube columns have lots of virtues such as better torsion rigidity, having no weak axis and so on, but there is little research of the connections between the rectangle steel tube columns and H shape steel beams, and by now there is not a series of appropriate configuration forms and calculating methods, so it restrains the application of the rectangle steel tube columns and H shape steel beams. Therefore it has important academic significance and application value for civil engineering to the research of the connections between the steel tube columns and H shape steel beams.The dissertation designed two outer diaphragm joints and vertical stiffener joints between the steel tube columns and H shape steel beams, then doing experiments under the low cycle hysteretic loads and giving the finite element analysis under monotonic loads. And then we obtained the hysteretic behavior, energy dissipation, rigidity degeneration, rotation capacity, ductility and the point of maximum stress under the low cycle hysteretic loads of the two kind connections. The experiments and the finite element analysis indicates that the two kinds connections have better energy dissipation and ductility behaviors. The plastic pins of outer diaphragm connections appear on the biggest section of the beam flanges and it can not change the location of the plastic pins to appear by adjusting the breadth of the outer diaphragms and the slope of the beam flanges. The location where plastic the pins to appear of the flange stiffened connections is owed to the details of the flange of the beams. The panel zones of middle connections of the two kinds of joints buckled by shearing forces, but the edge connections didn't buckle.The dissertation analyzed 16 outer diaphragm and vertical stiffener joints models with different parameters of the rectangle steel tube columns and H shape steel beams by the finite element nonlinear analysis, and the effects of the breadth of outer diaphragms, the slope of the beam flange and the flange stiffener length and height etc are obtained. It indicates that increasing the breadth of outer diaphragms can increase the yielding loading and limit loading and ductility of the outer diaphragm joints, however, on the contrary when the breadth of them increasing too much, the yielding loading and limit loading and ductility can't increase. Increasing the length and height of flange stiffeners can increase the yielding loading and limit loading of flange stiffened joints, and their ductility and failure locations are owed to the proportion of the length to height flange stiffeners.The dissertation gives out the suggestion of outer diaphragm and flange stiffened joints based on the test, the academic analysis results and relative design codes.