波纹腹板屈曲后可替耗能梁段残余承载力研究OA

The premature buckling of the flat steel web in the separated replaceable links is not conducive to the plastic deformation capacity of the web,and the heat effects and the presence of residual stresses after weld-ing the stiffening ribs reduce the energy-consuming capacity of the web.Therefore,in this paper,the trapezoi-dal corrugated webs with out-of-plane stiffness are introduced into the replaceable links to alleviate the unfavor-able effects of the stiffening rib welding process on their energy-consuming performance.Four test specimens are loaded in a unidirectional direction to analyze the failure modes,load-displacement curves,and web stress development of the links,and the formulas for calculating the critical buckling shear stress of corrugated webs based on the rotating stress field theory and for calculating the residual bearing capacity of the links based on the energy method are given.The results show that the corrugated web links have a good bearing capacity of up to 300.35 kN.The residual bearing capacity reaches up to 53.25%of the peak load,demonstrating replace-ability and a certain safety reserve capacity.The maximum difference between the theoretically calculated value of the critical buckling shear stress and the test value is 5.02%,and the maximum difference between the test value of the residual bearing capacity and the theoretical value is not more than 13.28%,which verifies the applicability of the given formulas.