ABSTRACT
Shear behavior of welded high strength I girders was studied by finite element analysis considering residual stress. The welding residual stress was measured by hole-drilling method for three high strength I girders. The average tensile residual stress near the weld in the flange was 120 MPa, and the average compressive residual stress in the middle of flange was 26 MPa. The average tensile residual stress near the weld in the web was 333 MPa, and the average tensile stress in the middle of web was 81 MPa. Then the residual stress distribution mode was proposed. The results of FE analysis and experimental results for shear behavior of high strength I girder were compared. The calibrated model was used to analyze the influence of depth-to-thickness ratio of web, width-to-thickness ratio of flange, restraint effect of flange or stiffener, and shear span ratio on the shear capacity and failure mode of I girders. Learn from analysis results, when the depth-to-thickness ratio of web was increased from 55 to 110, the ultimate shear capacity reduced by 54%. The ultimate shear capacity increased as the increase restraint effect of flange and stiffener. With the increase of shear span from 1.39 to 1.84, the ultimate shear capacity reduced by 10%.
