INTERNAL FORCE AND DISPLACEMENT OF A SYMMETRIC STRUCTURE UNDER LOAD

For a symmetrical structure under symmetrical load, the internal force and the displacement are symmetrical; under anti-symmetric loads, the internal force and the displacement are anti-symmetrical. Accord-ingly, the structural analysis can be simplified. In this paper the above conclusions are proved mathematically.On this basis, the theory of the internal forces and the displacements of a symmetrical structure under an arbitrary load is discussed.