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 symbolizes a fictitious position unaffected by the magnitude of the shear force – only the structure’s cross-sectional properties alter it. This point consistently rests along the axis of symmetry and can be pinpointed using an established technique.