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| Evolution laws of wind induced vibration response and wind induced vibration coefficients for a super large cooling tower in its whole construction process |
| ZHU Peng1,2, KE Shitang1 |
1. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. China Information Consulting & Designing Institude Co., Ltd., Nanjing 210019, China |
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Abstract The existing cooling tower code only has a single tower wind induced vibration coefficient to fully ignore the real time evolution of concrete material and structural performance in construction process. Here, a super large cooling tower with the height of 210 m was taken as the study object, and 8 3D solid models for cooling tower’s whole construction process were established comprehensively considering project schedule and calculation accuracy. 3D aerodynamic force time histories in cooling tower’s whole construction process were obtained based on the large eddy simulation method. The effectiveness of the numerical simulation results were verified by comparing the obtained tower surface wind pressures with those in the code and the existing curves actually measured at home and abroad. Furthermore, the full transient time domain method was used to contrastively analyze the real time variation features of cooling tower’s typical wind-induced vibration responses, such as, tower top displacement, axial force in meridional direction and bending moment in circumferential direction in its whole construction process. Based on 3 kinds of typical targets and five kinds of value-selecting methods, the evolution laws of the super large cooling tower’s wind induced vibration coefficient along the height direction and the circumferential direction angle in its whole construction process were systematically explored. The calculation formula for the super large cooling tower’s wind induced vibration coefficient changing along the height direction in its whole construction process was fitted for the first time. The study results provided a scientific reference for further understanding evolution laws of a cooling tower’s wind-induced vibration responses in its whole construction process and the differentiation value-selecting of its wind-induced vibration coefficient.
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Received: 02 August 2017
Published: 28 February 2019
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