TY - GEN
T1 - HIGH CYCLE FATIGUE BEHAVIOR OF REINFORCED CONCRETE
AU - Kuchma, Daniel A.
AU - Minaeijavid, Mohsen
AU - Viswanath, Somashekar
AU - Lafave, James M.
N1 - With funding from the U.S. Department of Energy, an experimental testing program is examining the impact of steel reinforcement, tensile stress, strain variation, and the order of stressing on compressive fatigue capacity. This is one of the first significant experimental testing programs to study the impact of steel reinforcement on the fatigue performance of concrete structures. The results from completed tests have identified shortcomings in existing fatigue models, and they are being used to suggest improved means to characterize damage and estimate fatigue life. This research project is also examining fatigue stress demands so to identify the primary sources of fatigue capacity utilization (demand/capacity for each stress state) and determine how they can be mitigated by turbine control settings. This includes the consideration of time dependent behavior including changes in the stiffness characteristics of structural concrete.
Support for this work was also provided by the U.S. Department of Energy’s Energy Efficiency and Renewable Energy office through project “Effect of Fatigue on the Capacity and Performance of Structural Concrete” (DE-EE0008961.0001). Additional support on this project was provided by the Ravindar K. and Kavita Kinra Fellowship from the Civil and Environmental Engineering Department at the University of Illinois for the first author is greatly acknowledged. Any views expressed are those of the authors and not the U.S. Department of Energy.
PY - 2022
Y1 - 2022
N2 - Towers and foundations that support wind turbines must be able to sustain high-cycle fatigue stress demands that are caused by waves, winds, and turbine operations. These demands often have high mean stress levels due to prestressing and/or mean wind speed, they can range into the millions of cycles of occurrence, and they often control design. In current practice, the fatigue design life of these structures is determined using “S-N curves” and Palmgren-Miner’s linear damage accumulation model. While this may be suitable for most steel structures, it is not suitable for most concrete structures. With funding from the U.S. Department of Energy, an experimental testing program is examining the impact of steel reinforcement, tensile stress, strain variation, and the order of stressing on compressive fatigue capacity. This is one of the first significant experimental testing programs to study the impact of steel reinforcement on the fatigue performance of concrete structures. The results from completed tests have identified shortcomings in existing fatigue models, and they are being used to suggest improved means to characterize damage and estimate fatigue life. This research project is also examining fatigue stress demands so to identify the primary sources of fatigue capacity utilization (demand/capacity for each stress state) and determine how they can be mitigated by turbine control settings. This includes the consideration of time dependent behavior including changes in the stiffness characteristics of structural concrete. This paper presents key observations and conclusions from the completed experiments, and a discussion of challenges in both fatigue testing and the development of suitable models and design requirements.
AB - Towers and foundations that support wind turbines must be able to sustain high-cycle fatigue stress demands that are caused by waves, winds, and turbine operations. These demands often have high mean stress levels due to prestressing and/or mean wind speed, they can range into the millions of cycles of occurrence, and they often control design. In current practice, the fatigue design life of these structures is determined using “S-N curves” and Palmgren-Miner’s linear damage accumulation model. While this may be suitable for most steel structures, it is not suitable for most concrete structures. With funding from the U.S. Department of Energy, an experimental testing program is examining the impact of steel reinforcement, tensile stress, strain variation, and the order of stressing on compressive fatigue capacity. This is one of the first significant experimental testing programs to study the impact of steel reinforcement on the fatigue performance of concrete structures. The results from completed tests have identified shortcomings in existing fatigue models, and they are being used to suggest improved means to characterize damage and estimate fatigue life. This research project is also examining fatigue stress demands so to identify the primary sources of fatigue capacity utilization (demand/capacity for each stress state) and determine how they can be mitigated by turbine control settings. This includes the consideration of time dependent behavior including changes in the stiffness characteristics of structural concrete. This paper presents key observations and conclusions from the completed experiments, and a discussion of challenges in both fatigue testing and the development of suitable models and design requirements.
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M3 - Conference contribution
AN - SCOPUS:85143906958
SN - 9782940643158
T3 - fib Symposium
SP - 1720
EP - 1729
BT - Proceedings for the 6th fib International Congress, 2022- Concrete Innovation for Sustainability
A2 - Stokkeland, Stine
A2 - Braarud, Henny Cathrine
PB - fib. The International Federation for Structural Concrete
T2 - 6th fib International Congress on Concrete Innovation for Sustainability, 2022
Y2 - 12 June 2022 through 16 June 2022
ER -