疲劳是由反复荷载（如桥梁上的交通荷载或风荷载）引起的机械退化过程，导致混凝土结构发生不可逆损伤。许多类型的混凝土构件承受重复荷载，例如机场和道路路面、桥梁主梁、桥面、风力涡轮机和预应力混凝土铁路系杆。本文件提供的信息将有助于对高周疲劳（即材料性能保持在弹性范围内的应力循环）下的混凝土结构的设计或修复感兴趣的实践工程师。 在总结现有文献的基础上，讨论了重复荷载对素混凝土、钢筋材料和钢筋混凝土系统的影响。本报告不包含详细的设计程序，但应视为提供钢筋混凝土结构疲劳问题全面概述的一般资源

Fatigue is a mechanical degradation process caused by repeated loads, such as traffic loading or wind loads on a bridge, that results in irreversible damage in concrete structures. Many types of concrete elements are subjected to repeated loads, such as airport and roadway pavements, bridge girders, bridge decks, wind turbines, and prestressed concrete railroad ties. This document provides information that will benefit practicing engineers interested in the design or rehabilitation of concrete structures subjected to high-cycle fatigue-that is, stress cycles in which the material behavior remains within the elastic range. The effects of repeated loads on plain concrete, reinforcing materials, and reinforced concrete systems are discussed based on a summary of available literature. This report does not contain detailed design procedures but rather should be considered a general resource providing a comprehensive overview of fatigue issues in reinforced concrete structures