Fatigue Characteristic for High-Strength Reinforced Concrete Structures

Project Details


Nowadays, the new-type steel reinforcement, in which the yield strength of the steel rebar is raised up to SD 690 grade, has been adopted into the new version design code of reinforced concrete structures, ACI 318-19. Such a rapid revolution in the new construction materials forms the research. The author has been involved in a series of researches on the seismic design of the New RC beams with SD 690 reinforcement since years ago. Then the new project is further to extend the study on the behavior of the new-type SD550/SD690 reinforced concrete (so called as “New RC”) at the ultimate stage to the behavior at the service load stage, specially focusing on the fatigue behavior of the New RC beams. Thus the results can be applied to the recent need for the design of New RC bridges, New RC high-tech manufacture plants, and the New RC foundation of the giant draught fans located around the Taiwan seashore. The project is proposed for a period of three years to investigate the fatigue design of New RC structures using SD690/SD550 screw bars. In the first and second year, several specimens of SD690/SD550 New RC T-beams will be tested under the cyclic fatigue loading. In the third year, the fatigue design parameters for the New RC beams will be found in accordance with the previous test results. These parameters include the S-N curves, the limit of the maximum bar stresses and stress ranges, and a rational fatigue life cycle of the New RC beams. Some specimens will also be tested to verify the Minor’s rule for finding the fatigue cycles subjected to multiple stress ranges. Meanwhile, the possibility of concrete fatigue, the degradation of concrete elastic modulus, and the effective stiffness of the New RC beams will be discussed.
Effective start/end date1/08/2030/11/21

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 9 - Industry, Innovation, and Infrastructure


  • SD550/SD690 high strength reinforcement
  • high strength concrete
  • fatigue characteristics
  • S-N curve


Explore the research topics touched on by this project. These labels are generated based on the underlying awards/grants. Together they form a unique fingerprint.