Q460高强钢管平行插板节点面内抗弯承载力特性及计算方法研究OA

To enhance the load-transfer reliability of Q460 high-strength steel tubular gusset plate joints,a novel tubular joint with parallel gusset plates is proposed,and its in-plane bending bearing capacity and calculation method are investigated.Two sets of in-plane bending bearing capacity tests were designed and conducted on Q460 high-strength steel tube-parallel gusset joints to study the failure modes,load-deformation behavior,and strain development at typical locations.Finite element models of the joints were established,and parametric analyses were performed to investigate the effects of key non-dimensional parameters on the bearing capacity,including the diameter-to-wall thickness ratio of the main tube(D/T),ratio of gusset plate length to main tube diameter(B/D),ratio of main tube diameter to gusset plate spacing(D/d),ratio of gusset plate thickness to joint plate thickness(tc/tr),and main tube axial force ratio(N/(Afy)).Based on these analyses,a recommended formula for calculating the in-plane bending bearing capacity of tube-parallel gusset joints was proposed.The results indicate that the failure mode of the joints involves local buckling of the main tube wall in the compression zone accompanied by bulging of the main tube wall between the gusset plates.The two parallel gusset plates evenly share the load transferred by the branch tube,and the gusset plates remain elastic when the joints lose their load-bearing capacity.The non-dimensional parameters D/T、B/D、D/d、N/(Afy)have significant effects on the load-bearing capacity of the joints,while tc/tr has a minor impact.The proposed formula for calculating the load-bearing capacity of the joints exhibits good applicability and can provide a reference for practical engineering.