Evolution of the wind-induced stability of super large cooling towers during the whole process of construction

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (10) : 172-180.

KE Shitang1,ZHU Peng2

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Abstract

The effects of the construction process are usually ignored while investigating the wind-induced stability of cooling towers. Choosing a domestic super large cooling tower (210 m) as the analysis object and considering the progress of the project and the calculation accuracy, the 3D models for eight cooling tower construction processes were established. THe three dimensional aero dynamic time history of the cooling tower during construction was obtained by a large eddy simulation. The validity of the numerical simulation was verified by comparing the measured tower wind pressure curves with the specification curves and the existing domestic and international measured curves. On this basis, taking the meridional axial force, which evolves in real time along with the construction progress, as a comparative object, the wind vibration coefficients in the construction period were presented. The integral and local stability of the cooling tower was analyzed by combinedly using the specification and the finite element method. The influences of the wind vibration coefficients, concrete age, construction loads, geometric nonlinearity and suction in the whole construction process on the cooling tower buckling stability and ultimate bearing capacity were discussed. The main conclusions were put forward, which are benefical to further understand the evolution and stability in the whole construction process of the cooling tower and to provide a scientific reference for protecting the cooling tower from the wind-induced failure in construction period.

Key words

Super large cooling tower / construction period / wind vibration coefficient / buckling stability / ultimate bearing capacity

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KE Shitang1,ZHU Peng2. Evolution of the wind-induced stability of super large cooling towers during the whole process of construction[J]. Journal of Vibration and Shock, 2018, 37(10): 172-180

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