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Open AccessArticle

Evolution Mechanism of Wind Vibration Coefficient and Stability Performance during the Whole Construction Process for Super Large Cooling Towers

by Shitang Ke 1,2,*, Peng Zhu 3, Lu Xu 4 and Yaojun Ge 2
1
Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2
State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
3
China Information Consulting & Designing Institute Co., LTD, Nanjing 210000, China
4
China Energy Engineering Group Guangdong Electric Power Design Institute Co., LTD, Guangzhou 510663, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(20), 4202; https://doi.org/10.3390/app9204202
Received: 28 August 2019 / Revised: 29 September 2019 / Accepted: 29 September 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Buildings and Structures under Extreme Loads)
Wind-induced damage during the construction process and the evolution of damage over time are important reasons for the wind-induced destruction of large cooling towers. In fact, wind vibration coefficient and stability performance will evolve with the construction height and material properties over time. However, the existing studies generally ignore the impact of wind load and structural performance during the construction period. In this study, we built the 3D physical model separately for all eight construction stages a super large cooling tower which is being currently constructed and stands 210 m. The dynamic characteristics of the cooling tower were analyzed in each stage. First, the flow field information and 3D time history of aerodynamic forces were obtained for the whole construction process using large eddy simulation (LES). Full transient dynamic finite element analysis was used to calculate the dynamic responses of the tower under the real-time changes of wind loads during the whole construction process. Five calculation methods were used to trace the evolution of wind vibration coefficient during the whole construction process of the super large cooling tower. Then the formula for wind vibration coefficient changing with the construction height was fitted. The differential values of wind vibration coefficient during the whole construction process of the cooling tower were discussed by taking the meridional axial force as the objective function. On this basis, the influence and working mechanism of wind vibration coefficient, concrete age, construction load, geometric nonlinearity, internal suction force on buckling stability, and ultimate bearing capacity of the cooling towers were investigated. This research provides an enhanced understanding on the evolution of wind-induced stability performance in super large cooling towers and a methodology to prevent wind-induced damage during the construction process. View Full-Text
Keywords: super large cooling tower; whole construction process; wind vibration coefficient; buckling stability; ultimate bearing capacity super large cooling tower; whole construction process; wind vibration coefficient; buckling stability; ultimate bearing capacity
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Ke, S.; Zhu, P.; Xu, L.; Ge, Y. Evolution Mechanism of Wind Vibration Coefficient and Stability Performance during the Whole Construction Process for Super Large Cooling Towers. Appl. Sci. 2019, 9, 4202.

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