Design of Overrun High-Rise Structure of Kunming China Railway Building Project

The height of Kunming China Railway building project is 226 m, and the seismic fortification intensity is 8 degrees. The structure has some problems of exceeding codes limits, such as irregular torsion, eccentric layout, discontinuity floor slabs, inclined column and so on. In order to solve aforementioned problems, the project creatively adopted the "high ductility, high energy dissipation" structure system, and targeted research was carried out on the problem, and finally the elastic-plastic verification under rare earthquake and very rare earthquake was carried out. The results showed that the torsional displacement ratio could be controlled by adopting the dense columns and diagonal braces; the tower could be divided into low-rise tower and high-rise tower, the eccentricity of stiffness center and mass center of the two parts was adjusted recpectively, the whole tower would not be twisted; after linear assembly, the discontinuity of slabs had no effect on the integrity of tower; the cracks of floor slabs could be controlled by post pouring concrete; the tower had strong torsion resistance, and eccentric load had no effect on its mechanical properties under rare earthquake; the equivalent damping ratio of the structure under rare earthquake was 11.5%, and the corrugated web steel coupling beam and SRC coupling beam were used to realize high energy dissipation; 1.2 times of rare earthquake caused tower collapse; as the second line of defense of the structure, the outer frame was weak, and the shear walls in the collapse related area should be equipped with section steel to improve the collapse resistance of the structure.