Abstract
Grid Cylindrical-Lattice Shells (GCLSs) have found their wide application in high-rise buildings and TV towers as the outer cylindrical frame of tube-in-tube structures subjected mainly to axial compression. This paper presents the elastic buckling behaviour of Grid Cylindrical-Lattice Shells (GCLSs) under axial compression. Because of a lack of lateral braces in the radial direction of the GCLS along its height, the GCLS tends to fail by two buckling modes under axial compression, namely global flexural buckling and circumferential multi-wave buckling. First, the fundamental three-story GCLS is investigated by using the energy method. The restraining action of the ring beam on the columns in the two buckling modes is explored separately, and this exploration leads to the radial rotational restraint stiffness, tangential rotational restraint stiffness and translational restraint stiffness of the ring beams, denoted by βr, βt and α, respectively; in addition, the corresponding elastic buckling loads of the three-story GCLS in the two buckling modes are separately derived. Then, based on the three key parameters, simple fitting formulas are developed to separately predict the elastic buckling loads of the multi-story GCLS in the two buckling modes. This outcome provides fundamentals for further establishing load-carrying capacity design of GCLSs under axial compression.
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