Research on shear lag effect of T-shaped short-leg shear wall

Abstract

Longitudinal displacement of cross section of T-shaped shortleg shear wall was simplified to three parts: shear lag warping displacement, plane section bending displacement and axial displacement. Shear lag warping deformation was assumed as cubic parabola distribution along flange, and based on minimum potential energy principle, differential equations were deduced; with boundary conditions, a calculation theory for shear lag effect was established. With two T-shaped short-leg shear wall models, vertical stresses of flanges were obtained by calculation theory and finite element calculation respectively, and comparison between theoretical analysis results and numerical calculation results was made. At last, parameter analysis was carried out, and the influence of shear force, shear span ratio and height-thickness ratio on shear lag coefficient was obtained. Research shows that numerical calculation results are in good agreement with theoretical analysis results, and each parameter has different influence on shear lag coefficient.