The shear center is an imaginary point, but does not vary with the magnitude of the shear force - only the cross-section of the structure. The shear center always lies along the axis of symmetry, and can be found using the following method:
The shear center is an imaginary location that does not shift with changes in shear force; its sole variation occurs within the structural cross-section. It always lies on the axis of symmetry, and its position can be determined through a particular method.