冷弯薄壁型钢部分包裹轻骨料混凝土L形角柱受压性能研究OA

This study addresses the technical challenges of local buckling in cold-formed thin-walled steel members and cracking in lightweight aggregate concrete(LAC)by innovatively proposing a prefabricated L-shaped cold-formed thin-walled steel corner column partially encased with lightweight aggregate concrete(referred to as an L-shaped PEC column).Two L-shaped steel columns and four L-shaped PEC columns were designed to systematically investigate the effects of LAC filling and batten spacing on the mechanical properties of the members.The experimental results indicate that the LAC filling can significantly suppress the buckling deformation of the steel members,increasing the buckling load-carrying capacity by 737.08%.While the batten spacing has an insignificant effect on the peak load and initial stiffness of the axially or eccentrically compressed specimens,it can delay the deformation of the specimens to a certain extent.The accuracy and reliability of the Abaqus finite element model were validated based on the experimental results,and a parametric analysis was further conducted to reveal the effects of steel strength,LAC properties,batten spacing,and eccentricity on the load-bearing performance of the L-shaped PEC columns.The parametric analysis results indicate that the material parameters and eccentricity significantly influence the ultimate bearing capacity of the specimens.The use of Q355 steel and LC40 lightweight aggregate concrete yields the most pronounced enhancement,with increases in ultimate bearing capacity of up to 14.60%and 14.85%,respectively.As the eccentricity increases,the ultimate bearing capacity decreases notably,with maximum reductions of 22.97%along the x-axis and 15.07%along the y-axis.The Batten spacing primarily prevents premature buckling and has a limited impact on the ultimate bearing capacity,with a reduction within 2.21%.