Experimental and Numerical Research on Partially Damaged H-Type Steel Beam Affected by Effects of Static Strain Aging
During the period of waiting for repair in a damaged steel structure building,the material properties of the steel are significantly affected by static strain aging,resulting in a change in the overall mechanical properties of the repaired steel structure after restoration.In order to study the effect of strain aging on the mechanical properties of steel beams,three Q355B hot-rolled H-shaped steel beams were designed,and the strain aging effect of damaged steel beams was studied by two-stage loading test method.Based on the test results,the ABAQUS finite element model was established to analyze the mechanical properties of the damaged steel beams after strain aging.An ABAQUS finite element analysis model was established by importing a secondary model and redefining material properties to model the different material properties of the steel before and after strain aging,and subsequently,the finite element model of the damaged steel beam affected by strain aging was established and the parametric analysis was carried out.The results show that the mechanical properties of the damaged steel beam are determined by the residual deformation and the mechanical properties of the steel.When the damage degree of the steel beam is small,the mechanical properties of the steel beam do not change significantly,and the ultimate bearing capacity of the steel beam decreases due to the residual deformation.When the strain of part section reaches 4.5%or above due to the damage and deformation of steel beam,it is no longer suitable for further use after repair.
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