MECHANICAL PROPERTIES ANALYSIS OF Z-SHAPED SPLICING JOINT OF CONCRETE- FILLED L-SHAPED STEEL TUBULAR COLUMN AND H-SECTION BEAM

In this paper, the finite element parameters of a kind of Z-joint of concrete filled steel tubular L-shaped column and H-shaped steel beam were analyzed. By changing seven parameters, 22 models were established to analyze the mechanical properties of each joint. The analysis showed that the connection of the splice plate at the web could be omitted, and the stiffeners of the weakened upper and lower flange could be used to replace the stiffeners of the rectangular upper and lower flange; increasing the number of high-strength flange bolts could improve the bearing capacity and total energy consumption of the joint, but the ductility performance was reduced; increasing the pretension of flange high-strength bolts could improve the sliding load and total energy consumption, and delay the slip of the joint; increasing the thickness of the upper and lower flange stiffeners could improve the positive peak load and total energy consumption of the joint; increasing the height of the upper and lower flange stiffeners could improve the slip load and total energy consumption of the joint; the upper and lower flange stiffeners could significantly improve the mechanical properties of the joint. Each joint had good ductility and plastic rotation capacity.