Forces acting on frame tend to induce three types of internal forces i-e bending moment, axial force and shear force. which means that frame member can be seen as combination of truss and beam member.

Simple definition of virtual work method is “External work done is equal to internal work done”

In frames axial deformation are usually small when compared with bending deformation and it is common to neglect axial deformations however in this video by Dr Structure all possible deformations are taken into account.

Virtual work method forĀ Frames

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