22.5 : 薄壁构件的非对称载荷

When thin-walled members with non-symmetrical cross-sections are subjected to unsymmetric loading, they experience bending and twisting.

This dual effect leads to various stress distributions within the structure. If not properly managed, these stresses can result in deformation or even failure.

The unsymmetrical loading causes the member to bend due to alterations in its curvature and twist as torque is introduced.

The unsymmetrical loading is medicated by applying the load at the shear center of the member's cross-section. The shear center is a specific point within the cross-section where, if a load is applied, it will only cause bending, thereby eliminating the possibility of twisting.

A clear understanding of the location of the shear center and how to apply loads effectively can significantly enhance the stability and performance of thin-walled members.

When a load is applied obliquely at the shear center, the member remains free of any twist. The load is split into two components corresponding to symmetric and unsymmetric loading conditions, neither of which induces twisting in the member.