【摘要】：大跨度橋梁柔性大、自振頻率低,風致振動是其設(shè)計的控制因素。對于大跨度閉口鋼箱梁橋,低速繞過的氣流常在其兩側(cè)形成旋渦,旋渦的不均勻脫落形成渦激振動,影響行車安全和舒適性。本文以閉口鋼鋼箱梁橋為研究對象,基于節(jié)段模型測力、測振同步渦激振動風洞試驗,對Scanlan經(jīng)驗非線性模型氣動參數(shù)識別關(guān)鍵問題進行了研究。首先,進行節(jié)段模型測力、測振同步渦激振動風洞試驗,提取渦激振動和天平力時程信號�；谶f歸圖及其定量分析理論,對測力、測振數(shù)據(jù)進行遞歸分析,研究了渦激氣動力和渦振位移最優(yōu)尺度的選擇方法。其次,基于Scanlan經(jīng)驗非線性渦激氣動模型,使用最小二乘法對分離所得渦激力進行模型參數(shù)識別。研究了測力、測振非同步對Scanlan經(jīng)驗非線性渦激氣動模型參數(shù)識別的影響,發(fā)現(xiàn)微小的時間延遲對參數(shù)識別和反算結(jié)果造成較大的影響,證明Scanlan經(jīng)驗非線性渦激氣動模型對于測力、測振同步性非常敏感,保持實驗?zāi)Ｐ蜏u激力與位移數(shù)據(jù)同步采集,對該類試驗非常重要。最后,基于Scanlan經(jīng)驗非線性渦激氣動模型參數(shù)識別結(jié)果,實現(xiàn)了二維渦激振動響應(yīng)數(shù)值模擬方法。完整模擬了橋梁從渦振起振到渦振消失的全過程,并將數(shù)值模擬結(jié)果與試驗結(jié)果進行了對比,兩者均呈現(xiàn)“幾”字型,驗證了本文渦激振動數(shù)值模擬方法的正確性。
[Abstract]:Long span bridge is flexible, low natural vibration frequency and wind-induced vibration is the control factor of its design. For long span closed steel box girder bridge, vortex is often formed by low speed flow around the bridge, and vortex-induced vibration is formed by uneven shedding of vortex, which affects driving safety and comfort. In this paper, the key problem of aerodynamic parameter identification of Scanlan empirical nonlinear model is studied based on the wind tunnel test of synchronous vortex-induced vibration measured by segmental model. Firstly, the wind tunnel test of synchronous vortex-induced vibration was carried out by using segmental model to extract the vortex-induced vibration and balance force time-history signals. Based on the theory of recursive graph and quantitative analysis, the method of selecting the optimal scale of vortex-induced air force and vortex-induced displacement is studied by recursively analyzing the data of force and vibration measurement. Secondly, based on the Scanlan empirical nonlinear vortex-induced aerodynamic model, the model parameters of the separated vortex-induced forces are identified by the least square method. The influence of force measurement and vibration measurement on the parameter identification of Scanlan empirical nonlinear vortex-induced aerodynamic model is studied. It is found that the small time delay has a great influence on the parameter identification and back-calculation results. It is proved that the empirical nonlinear vortex-induced aerodynamic model of Scanlan is very sensitive to force measurement and vibration measurement synchronism. It is very important for this kind of test to keep the data of vortex-induced force and displacement simultaneously collected from the experimental model. Finally, based on the Scanlan empirical nonlinear vortex-induced aerodynamic model parameter identification results, a two-dimensional vortex-induced vibration response numerical simulation method is realized. The whole process of bridge vibration from vortex vibration to vortex vibration disappearance is simulated, and the numerical simulation results are compared with the experimental results. The numerical simulation results show "several" shape, which verifies the correctness of the numerical simulation method of vortex-induced vibration in this paper.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441.3

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