OCCURRENCE AND EFFECTS OF TORSIQNAL MOMENT BY SHIFTING OF SHEAR CENTER OF RC CROSS SECTION

Abstract

For members with symmetric cross-sections, the geometric centroid and shear center are coincident. Thus, if lateral load is applied through the geometric centroid, a torsional moment is not induced. RC cross-sections typically, however, develop asymmetric resistance mechanisms, resulting in progressive movement of the shear center away from the geometric centroid as nonlinearity increases and the section responds to bi-axial loading. In this study, the mechanism causing shifting of the shear center for RC cross-sections was investigated using frame elements with a fiber-type discretization of the member cross-section. Then, the effects of torsional moment induced by the shifting of the shear center was discussed.