Local Buckling Behavior of Steel-Concrete Composite Shell Hybrid Wind Tower Under Axial Compression

In order to solve the problem that the traditional steel tower is prone to collapse due to local buckling under axial compression, considering the principle of steel-concrete composite structures, a new type of steel-concrete composite shell hybrid tower for wind power tower structure was proposed. In order to study the buckling bearing capacity of steel plate in steel-concrete composite shell hybrid tower, three specimens were designed considering the key parameters such as the curvature (the reciprocal of radius) and the spacing-to-thickness ratio (the ratio of vertical stud spacing and surface steel plate thickness). The inner and outer steel plates were connected to the concrete by the studs, and the concrete did not directly bear the vertical load and only provided brace to the steel plates. Polytetrafluoroethylene membrane was laid between the steel plates and concrete to eliminate the friction and adhesion between the steel plates and sandwich concrete. The specimens were tested under axial compression, the failure modes and load-displacement curves of the specimens were obtained. The test results showed that: 1)local buckling failure between studs occurred in all specimens. 2)Compared with the specimen with curvature of 0.001 and the flat steel plate specimen, setting curvature structure could greatly improve the buckling bearing capacity. 3)Reducing the spacing-to-thickness ratio could also improve the buckling bearing capacity of the specimen.