重型机械承载构件的强度失效绝大多数是由于应力集中而引起疲劳破坏。因此,对这种构件的疲劳强度研究是极其重要的。预应力机架,尤其是预应力钢丝缠绕机架有较高的疲劳强度,除了它在结构上的特点外,还由于它能较好地满足现代疲劳设计理论的基本观点。本文试图从理论上予以阐述,将预应力结构分为预紧部件和被预紧部件,分别进行疲劳强度的研究,以及如何估计预应力损失,并通过实验予以验证。供参考。 The failure of heavy mechanical load-bearing members is mostly due to fatigue caused by stress concentration. Therefore, the fatigue strength of such components is extremely important. In addition to its structural characteristics, prestressed racks, especially prestressed steel wire wound racks, are also characterized by their fatigue strength as well as their basic concept of modern fatigue design. This paper attempts to expound in theory, the prestressed structure is divided into pre-stressed parts and pre-stressed parts, respectively, the study of fatigue strength, and how to estimate the loss of prestress, and through experiments to be verified. for reference.