新型半刚性梁-柱节点钢框架结构承载性能数值模拟研究OA

Traditional H-shaped steel beam-column end-plate connections were redesigned to enable frame columns to connect to frame beams using identical end-plate joints along both principal axes.These modified joints were subsequently applied in single-layer frames-both braced and unbraced-to connect frame columns along the strong axis to the beams.Seven frame configurations were designed considering variables such as the presence of cross-bracing,brace connection plates,stiffener types,and beam-column joint details.Finite element models of these frames were developed and subjected to monotonic loading to investigate their mechanical performance.The results show that frames with the improved end-plate joints exhibit comparable initial stiffness,yield load,ultimate bearing capacity,and displacement ductility coefficient to those with conventional end-plate joints.However,shear deformation within the joint core area is significantly reduced.The inclusion of bracing markedly enhances frame stiffness and load-bearing capacity,though it alters the failure mode from end-plate bending to net-section tension failure of the braces.Compared with the unbraced frame,the braced frame demonstrates a 144％increase in initial stiffness,a 123％increase in yield load,and a 128％increase in ultimate bearing capacity.