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Structural Engineering and Mechanics Volume 49, Number 5, March10 2014 , pages 619-629 DOI: https://doi.org/10.12989/sem.2014.49.5.619 |
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Effects of stiffening rings on the dynamic properties of hyperboloidal cooling towers |
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Jun-Feng Zhang, Huai Chen, Yao-Jun Ge, Lin Zhao and Shi-Tang Ke
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| Abstract | ||
| As hyperboloidal cooling towers (HCTs) growing larger and slender, they become more sensitive to gust wind. To improve the dynamic properties of HCTs and to improve the wind resistance capability, stiffening rings have been studied and applied. Although there have been some findings, the influence mechanism of stiffening rings on the dynamic properties is still not fully understood. Based on some fundamental perceptions on the dynamic properties of HCTs and free ring structures, a concept named \"participation degree\" of stiffening rings was proposed and the influence mechanism on the dynamic properties was illustrated. The \"participation degree\" is determined by the modal deform amplitude and latitude wave number of stiffening rings. Larger modal deform amplitude and more latitude waves can both result in higher participation degree and more improvement to eigenfrequencies. Also, this concept can explain and associate the pre-existing independent findings. | ||
| Key Words | ||
| hyperboloidal cooling towers; stiffening rings; participation degree; dynamic properties; modal deform amplitude; latitude wave number | ||
| Address | ||
| Jun-Feng Zhang, Huai Chen : School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China Yao-Jun Ge, Lin Zhao : Department of Bridge Engineering, Tongji University, Shanghai 200092, China Shi-Tang Ke : Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China | ||