超大型冷却塔施工全过程风振响应及风振系数演化规律研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (5) : 179-189.

论文

朱鹏1,2 柯世堂1

作者信息 +

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

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摘要

现有冷却塔规范仅给出了成塔单一风振系数取值，完全忽略了施工过程中混凝土材料和结构性能的实时演化。以国内某在建210m世界最高超大型冷却塔为对象，综合考虑工程进度与计算精度建立八个冷却塔施工全过程三维实体模型，基于大涡模拟（LES）技术获得了施工全过程冷却塔三维气动力时程，将成塔表面风压与规范及国内外现有实测曲线对比验证了数值模拟的有效性。在此基础上，采用完全瞬态时域方法对比分析了冷却塔施工全过程塔顶位移、子午向轴力及环向弯矩等典型响应风振实时变化特性，并基于三种典型目标和五种取值方法系统探讨了超大型冷却塔施工全过程风振系数沿高度和环向角度的演化规律，最终首次拟合给出了超大型冷却塔施工全过程随高度变化的风振系数计算公式。研究结论可为进一步理解施工全过程冷却塔风振响应的演化规律和风振系数差异化取值提供科学参考。

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.

关键词

超大型冷却塔 / 施工全过程 / 大涡模拟 / 风振响应 / 风振系数 / 演化规律

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朱鹏1,2 柯世堂1. 超大型冷却塔施工全过程风振响应及风振系数演化规律研究[J]. 振动与冲击, 2019, 38(5): 179-189

ZHU Peng1,2, KE Shitang1. Evolution laws of wind induced vibration response and wind induced vibration coefficients for a super large cooling tower in its whole construction process[J]. Journal of Vibration and Shock, 2019, 38(5): 179-189

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