【摘要】：眾所周知,懸索橋是以承受拉力的纜索作為重要承重構件的橋梁,是典型的柔性結構,而由于懸索橋橋梁結構自重輕,阻尼低,在常風速的條件下,懸索橋橋梁及其構件(如主梁、主纜、吊索等)極易發(fā)生渦激共振響應,因此,對于懸索橋鉸接式吊索的渦激振動研究是很有必要的,也是很有意義的。為了探討用數(shù)值方法研究懸索橋吊索渦激振動現(xiàn)象,本文以某大跨徑懸索橋鉸接式吊索為背景,采用計算流體力學軟件CFX和ANSYS結構建模軟件Workbench相結合的流固耦合模擬方法進行懸索橋鉸接式吊索的渦激振動數(shù)值模擬,模擬得到鉸接式吊索發(fā)生渦激共振時的相關參數(shù),求出最大振幅及吊索發(fā)生渦激共振時的鎖定風速,具有一定的工程實用價值。首先,本文參考已有文獻分別建立了二維單圓柱繞流模型和二維單圓柱流固耦合模型,分別進行了單圓柱繞流計算和單圓柱流固耦合計算,得到繞流及流固耦合的相關參量,并與已有參考文獻進行了對比分析,驗證了本文所使用的流固耦合模擬方法的正確性;其次,利用本文的建模方法和流固耦合模擬方法建立并計算了并列兩圓柱在兩種不同湍流模型(RNG??-和SST??-湍流模型)下的渦激振動響應,對這兩種不同的湍流模型的計算結果進行比較分析,得到相應的結論:在進行并列兩圓柱渦激振動數(shù)值計算時,兩種湍流模型的結果存在一定差異,而且從結果可以看出SST??-湍流模型的數(shù)值模擬結果更加接近于實驗值,SST??-湍流模型優(yōu)于RNG??-湍流模型;最后,利用本文的建模方法建立了某大跨徑懸索橋鉸接式吊索的二圓柱吊索流固耦合模型,采用有限元軟件ANSYS對五種不同長度的吊索(D39號、D41號、D44號、D46號和D49號吊索)進行模態(tài)分析,以確定吊索的自振頻率,進而確定吊索的剛度及阻尼;選取其中的三種吊索(D39號、D44號和D46號吊索)進行渦激振動仿真計算,分別計算了這三種不同長度吊索的渦激振動響應,得到吊索發(fā)生渦激振動的鎖定風速,發(fā)生渦激振動時吊索的最大振幅等,得到結論:D39號、D44號和D46號吊索發(fā)生渦激振動的鎖定風速依次增大,而D39號吊索的鎖定風速較D44號吊索和D46號吊索小得多,說明D39號吊索在較低風速下最容易發(fā)生渦激振動,在實際工程中要做好抑振措施。
[Abstract]:As we all know, suspension bridge is a typical flexible structure, which takes cable bearing force as an important load-bearing component. However, because of its light weight and low damping, the suspension bridge is under the condition of constant wind speed. The vortex-induced resonance response of suspension bridge and its components (such as main girder, main cable, sling and so on) is easy to occur. Therefore, it is necessary and meaningful to study the vortex-induced vibration of suspension bridge hinged slings. In order to study the vortex-induced vibration of suspension bridge by numerical method, this paper takes the hinged slings of a long-span suspension bridge as the background. The numerical simulation of vortex-induced vibration of hinged slings of suspension bridges is carried out by using the fluid-structure coupling simulation method of CFX and ANSYS structure modeling software Workbench. The relevant parameters of vortex-induced resonance of hinged slings are obtained by simulation. It is of great practical value to calculate the maximum amplitude and the locked wind speed when the sling resonates with vortex-induced resonance. First of all, two dimensional single cylinder flow model and two dimensional single cylinder fluid-solid coupling model are established with reference to the previous literatures. The calculation of single cylinder flow and single cylinder fluid-solid coupling are carried out respectively, and the related parameters of flow and fluid-solid coupling are obtained. The results are compared with the references, and the validity of the fluid-solid coupling simulation method used in this paper is verified. Secondly, the vortex-induced vibration responses of two parallel cylinders under two different turbulence models (RNG??- and SST??- turbulence models) are established and calculated by using the modeling method and the fluid-solid coupling simulation method in this paper. The results of the two different turbulence models are compared and analyzed, and the corresponding conclusions are obtained: the results of the two turbulence models are different when the vortex-induced vibration of two parallel cylinders is numerically calculated. From the results, it can be seen that the numerical simulation results of the SST??- turbulence model are closer to the experimental results, and the SST??- turbulence model is better than the RNG??- turbulence model. Finally, the fluid-solid coupling model of two cylindrical slings of a long span suspension bridge with hinged slings is established by using the modeling method in this paper. The finite element software ANSYS is used to analyze five kinds of slings of different lengths (D39, D41, D44). In order to determine the natural vibration frequency of the sling and then determine the stiffness and damping of the sling, the modal analysis is carried out for D46 and D49 sling. Three kinds of sling (D39, D44 and D46 sling) are selected to simulate the vortex-induced vibration. The vortex-induced vibration responses of the three slings of different lengths are calculated respectively, and the locked wind speed of the vortex-induced vibration of the sling is obtained. It is concluded that the locking wind speed of Vortex excited vibration of D39, D44 and D46 sling increases in turn, while the locked wind speed of D39 sling is much smaller than that of D44 and D46 sling. It is shown that the vortex vibration of D39 sling is most likely to occur under low wind speed, and the vibration suppression measures should be done well in practical engineering.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3;U448.25

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