SIMPLIFIED CALCULATION OF MINIMUM POTENTIAL ENERGY METHOD FOR HIGH-RISE DIAGRID STRUCTURE

The high-rise diagrid tube structure is composed of diagonal columns and horizontal ring beams. The diagonal columns are mainly subjected to axial forces. The equivalent-stiffness method is used to make the high-rise diagrid tube structure to be an equivalent continuum anisotropic plate-shell model, and the displacement field closed-form solution of the equivalent model is obtained by the principle of minimum potential energy. The results show that the equivalent continuum method for high-rise diagrid tube structure is correct in calculating the structural lateral displacement, and the internal force distribution of the structure can also be obtained. This kind of structure is the superposition of bending and shear deformation. The structure has obvious shear lag effect. By the equivalent simplification method, the three-dimensional tube structure can be transformed into a plane model with equal stiffness and without changing the internal force distribution. The equivalent continuous simplification method proposed can provide a theoretical reference for the further study of high-rise diagrid tube structures.