Fluid–structure interaction vibration characteristics of the AFT workshop structure based on micro-vibration monitoring
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摘要: AFT氧化風機房是脫硫工藝中的一種鋼筋混凝土結構支撐鋼罐的復合結構，結構產生的明顯振動不利于正常生產運營，因此針對AFT結構進行現場監測和模擬計算。首先對AFT結構進行現場調查，基于一種AFT結構視頻監測與局部監測相結合的方法對其進行監測，隨后又提出簡化攪拌機及氧化風作用的模擬方法，通過數值模擬對AFT結構振動特性進行研究。結果表明：對AFT結構進行視頻監測可快速明確結構運動軌跡；局部監測結果表明攪拌機作用是結構振動的主要因素，氧化風的鼓入加劇了結構振動響應，因此造成了結構各柱間填充墻不同程度的損傷；將數值模擬結果與監測結果對比，驗證了簡化攪拌機及氧化風作用的計算方法，可為分析此類結構振動響應、損傷機制以及加固設計提供參考。Abstract: An AFT oxidation fan room is a kind of composite structure of reinforced concrete structure supporting the steel tank in the desulfurization process. It is a common structural form of a power plant. The obvious vibration generated by the structure is not conducive to the normal production and operation of the power plant and may even cause accidents. Therefore, on-site monitoring and a simulation calculation are carried out for the AFT structure to study the causes of vibration of the AFT structure and clarify its vibration mechanism. First, a field investigation of the AFT structure is carried out combining video monitoring and local structure vibration monitoring. Based on the simulation method of the fluid-solid interaction, a simulation method to simplify the action of the mixer and the oxidation wind in the steel tank is then proposed, and the vibration characteristics of the AFT structure are further studied through the proposed numerical simulation method. Finally, numerical simulation results are compared with the monitoring results, and causes of vibration differences in various parts of the structure are studied. Results show that video monitoring can quickly identify the structure movement track. Local monitoring results show that the mixer is the main factor of the structural vibration, and the aeration of the oxidation wind intensifies the structural vibration response, causing different degrees of damage to the infill wall between the columns of the structure. The dynamic response law of different positions of each column and the upper steel tank of the structure is found to be more different. A comparison of numerical simulation results with monitoring results verified the calculation method of simplifying the mixer and the oxidation wind effect, providing a reference for the analysis of the vibration response, damage mechanism, and reinforcement design of such structures.
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圖 2 結構與設備的設置。（a）攪拌機與氧化風立面布置；（b）攪拌機平面布置
Figure 2. Structure and equipment set: (a) vertical layout of the mixer and the oxidation wind; (b) plane layout of the mixer
圖 4 結構背立面示意及視頻監測位置
Figure 4. Schematic diagram of the structure’s back elevation and the video monitoring position
圖 8 加速度及位移測點布置圖。（a）底部B柱測點布置；（b）底部柱測點；（c）上部測點布置
Figure 8. Layout of acceleration and displacement measuring points: (a) layout of the measuring points of the B-pillar at the bottom; (b) bottom column measuring point; (c) arrangement of upper measuring points
圖 9 鋼罐測點加速度時程（a）及位移時程曲線（b）
Figure 9. Time history curves of acceleration (a) and displacement (b)
圖 10 鋼罐測點加速度（a）及位移峰值分布（b）
Figure 10. Peak distribution of the acceleration (a) and displacement (b) at measuring points of the steel tank
圖 12 有無氧化風作用下結構位移對比。（a）結構各柱位移峰值對比；（b）結構B柱位移曲線對比
Figure 12. Comparison of the structural displacement with and without oxidation wind: (a) comparison of the peak displacement of each column; (b) comparison of displacement curves of the structural B column
圖 13 B柱有無氧化風鼓入位移頻譜對比
Figure 13. Displacement spectrum comparison of the B column with or without blowing of the oxidation wind
圖 14 AFT結構計算模型。（a）AFT- Structure模型；（b）AFT-CFD模型
Figure 14. AFT structural calculation model: (a) AFT structure model; (b) AFT-CFD model
圖 15 沿罐高位移及加速度時程曲線。（a）工況b沿罐高的x向位移時程；（b）工況d沿罐高的位移時程；（c）工況b沿罐高加速度時程；（d）工況d沿罐高加速度時程
Figure 15. Displacement and acceleration time history curves along the tank height: (a) x-direction displacement time history of Conditionb along the tank height; (b) displacement time history of Conditiond along the tank height; (c) acceleration time history of working Conditionb along the tank height; (d) acceleration time history of working Conditiond along the tank height
圖 16 工況d的AFT結構位移云圖
Figure 16. Displacement nephogram of the AFT structure in Condition d
圖 17 各工況沿罐高的位移峰值（a）及加速度峰值（b）對比
Figure 17. Comparison of the peak values of displacement (a) and acceleration (b) along the tank height under different working conditions
圖 18 結構柱各工況的位移峰值對比
Figure 18. Comparison of the peak displacement of the structural column under different working conditions
圖 19 工況d頻譜圖。（a）位移頻譜；（b）加速度頻譜
Figure 19. Displacement (a) and acceleration spectra (b) of Condition d
表 1 模型計算參數
Table 1. Model calculation parameters
Material Elastic modulus/Pa Density/(kg·m?3) Poisson's ratio Concrete 3.1×1010 2550 0.2 Steel 2.06×1011 7850 0.3 Material Viscosity Density Fluid 0.02 1250 
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久色视频表 2 加載工況對比表
Table 2. Comparison of the loading case
Working condition If there is oxidation wind Simulation loading size of mixer/(m·s?1) a No 1 b Yes 1 c No 2 d Yes 2
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