Static and dynamic analysis of tall tube-in-tube structures by finite story method

The finite story method, based on nodal displacement fields developed previously, is extended herein for approximate three-dimensional analysis of tall building tube-in-tube structures. The core tube in each story is modeled as a thin-walled beam element and represented by its extended stiffness matrix. Reliable solutions for core tube torsional deformation, bimoments and warping stresses are first obtained with this simplification for core tube analysis. The finite story method is then applied to obtain displacements, natural frequencies and modes of vibration for both symmetric and asymmetric tube-in-tube structures. The numerical results compare favorably with other solutions, including full finite element modeling, and demonstrate the high efficiency and acceptable accuracy of the method. Copyright (C) 1996 Elsevier Science Ltd.