| Today,Concrete-filled double skin steel tubular column has been completely into the vision of the architect.Many scholars have proposed a systematic theoretical system for this structure.However,there are few researches on the joint performance of concrete-filled double skin steel tubular column.Moreover,the diversity and complexity of joints also determine the difficulty of establishing a complete theoretical system.One of these is the joint of concrete-filled double skin steel tubular column(CHS inner and SHS outer)to unequal position H-shaped steel beam.This form is different from the common cross symmetric joint.The different height of H-shaped steel beam on both sides will result in the different direction and magnitude of the load transferred from the steel beam to the column,and this form for the architectural style involved to provide a more diverse choice of space.Therefore,this paper establishes ABAQUS model for this joint type.The influence of different variables on the bearing capacity of joints is also analyzed.A practical calculation formula is presented.The joint stiffness type is judged.Hope to provide some theoretical support and industry reference for future research.The specific research contents are as follows:(1)The stress mechanism of the concrete-filled double skin steel tubular column(CHS inner and SHS outer)to unequal position H-shaped steel beam under vertical load of column end and beam end and the stress-strain state of each parts under different stages are analyzed.(2)Ratio of axial compression stress to strength,web height,flange thickness,unequ al beam altitude difference,steel beam strength and concrete strength were used as pa rameter variables to carry out FINITE element simulation of ABAQUS for 13 compon ent.Explore the influence of different parameter variables on the ultimate bearing capac ity of joints.(3)Referring to a large number of literature,the practical calculation formula of the shear capacity of the core area of the joints is extracted.The shear load bearing ratio of each part in joint core area is analyzed.Finally,the stiffness type of the joint is judged。... |
