ABSTRACT
Steel frame column flange is prone to structural failure due to stress concentration, fatigue damage, and local buckling under low-frequency cyclic load. The metal magnetic memory detection technology can identify the stress concentration and damage area of ferromagnetic components by the change of their leakage magnetic field. In this paper, the normal magnetic signal of a steel frame under the corresponding displacement was measured by the low-cycle reciprocating loading test. Combined with the equivalent stress extracted by ANSYS numerical simulation, the feasibility of the metal magnetic memory detection technology for detecting the stress-concentrated parts of the structure under complex stress was studied. This study provided a basis and reference for quantitative assessment and early warning of the damaged state of steel frames by the metal magnetic memory detection technology.
