Seismic performance analysis of wedge-shaped Castellated portal frame

In order to study the seismic performance of wedge-shaped light steel castellated portal frame, the finite element analysis software Abaqus is used to simulate the seismic behavior of the portal frame with a single span hexagonal hole with a span of 24m. The influence of the opening ratio and the distance between the first hole of the near column and the end to the column edge on the hysteretic curve, skeleton curve, stiffness degeneration, ductility and energy dissipation capability are analyzed and the ultimate destructive form is also obtained. The results show that under the low cycle reciprocating load, the castellated light steel portal frame forms the plastic hinge on both sides of the structure near the first hole, and the structure loses its carrying capacity. The greater the opening ratio is, the lower the ultimate bearing capacity is, and the stiffness degeneration is more notable, ductility and energy dissipation are worse. The distance between the first hole of the near column and the end to the column edge has great influence on the ultimate bearing capacity, stiffness degradation and ductility. The greater the distance is, the better the ultimate bearing capacity and the ductility are