Application of bionic design inspired by bamboo structures in collapse resistance of thin-walled cylindrical shell steel tower

Abstract

In recent years, with the popularization of high-performance structures, higher requirements are put forward for design theory and method. Based on the analysis of the relationship between macro characteristics of the structure and mechanical properties of bamboo, a bionics design method of cylindrical shell structure is proposed in this paper. Through curve fitting, the variation of geometric parameters such as stiffener spacing, bamboo body diameter, and wall thickness along the height were obtained. The bamboo body bending stiffness was calculated. Based on the principle of equivalent change of bending stiffness, the bamboo-inspired design is realized by changing the wall thickness and setting the stiffeners. In the case of small deformation, the mechanical performance of the bamboo-inspired structure is close to that of an ordinary structure. After the structure reaches the yield stage, the advantage of the bamboo-inspired structure is more apparent, and the ductility coefficient of the bamboo-inspired structure is about twice that of an ordinary structure. The bamboo-inspired structure has good adaptability to large deformation due to its good ductility mechanism, which can be used to improve the collapse resistance of the structure under large deformation. With the example of a thin-walled cylindrical shell in a thermal power plant, the application analysis of bamboo-inspired design is carried out. The rationality of the bamboo-inspired structure is verified by the shaking table test. The test results show that the bamboo-inspired cylindrical shell structure mainly undergoes local buckling and slight bending of the tower body under the action of the high-intensity rare earthquake. Still, no collapse failure occurs, which meets the performance index of no collapse under the condition of large deformation.