Semi-Analytical Analysis of Super Tall Building Bundled-Tube Structures

摘要

A new semi-analytical method is developed for the analysis of interactions between the subgrade and the foundation and the superstructure of the super tall building bundled-tube structure by three-dimensional model. That is, the superstructure and its foundation of the super tall building bundled-tube structure are simplified equivalently and continuously to a combination of stiffened-thin-wall tubes on semi-infinite elastic subgrade; then discretization is made by some nodal lines, the unknown functions defined on the lines are used as primary unknowns, and interpolating functions are implemented between the lines; thirdly the principle of minimum potential energy is applied so as to change the analysis of a tall building structure into the solution of the boundary problem of a group of ordinary differential equations, which can be solved by the precise and powerful Ordinary Differential Equation Solver—COLSYS. The interactions between the subgrade and the foundation and the superstructure of a super tall building bundled-tube structure due to static loadings are analyzed by the method based on the model. The numerical results show that the analytical model is reasonable and feasible. Therefore, a practicable method for the global analysis of the super tall building bundled-tube structure is obtained, and some valuable conclusions are also acquired through analyzing the computing results.