关键词: 预应力, 钢管混凝土, 振动, 有限元分析

Abstract: The dynamic control equation of a new prestressed partially concrete-filled rectangular steel tube (CFRT) beam can be derived based on D’Alembert’s principle. It is used to infer the theoretical results of the dynamic characteristics for the prestressed CFRT beam. Additionally, the finite element model is set up by ABAQUS for simulation analysis. The results show that the natural vibration frequencies and mode function of the prestressed CFRT simply supported beam calculated by the theoretical formulas are reliable since the relative errors of the first-order frequencies under different prestressing levels are within 6% compared with the finite element results. Further analysis of the prestressing parameters is carried out using the theoretical formulas, in which factors such as the prestressing level, eccentricity of tendons, and tensile stiffness of prestressed tendons have different influences on the natural vibration frequencies. Finally, it provides a theoretical basis for the dynamic design of the prestressed CFRT beams.