侧向冲击作用下CFST梁柱子结构抗冲击性能研究OA

Concrete-Filled Steel Tubular(CFST)beam-column structures are often subjected to the coupling action of axial compression and lateral impact during their service life.To reveal the impact resistance of the structure under this working condition,this study established a numerical model of the CFST beam-column substructure based on the ABAQUS finite element analysis software.The modeling method was validated against existing axial compression-lateral impact coupling tests,and the effects of axial compression ratio,impact mass,and impact positionon the structural impact resistance were systematically investigated.The results show that when the axial compression ratio increases from 0.5 to 0.7,the peak lateral deformation of the column increases by 267.35 mm and the dynamic response time of the structure is prolonged,with no significant effect on the peak impact force.When the impact mass rises from 1.9 t to 4.5 t,the increase in impact kinetic energy leads to a 1.77-fold rise in the peak lateral deformation of the column and an expansion of the structural stress distribution range.When the impact position increases from 0.84 m to 1.39 m,the lateral displacement of the column increases by 15%,and it decreases slightly with a further rise to 1.69 m.The closer the impact point is to the mid-column,the longer the dynamic response time of the structure becomes.The results can provide a theoretical reference for the impact resistance design of CFST beam-column substructures.