本文選題：橋梁工程 + 風(fēng)洞試驗��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：弱阻尼、長、細(xì)、輕、柔、是橋梁發(fā)展方向的主趨勢，橋梁結(jié)構(gòu)（構(gòu)件）的動力響應(yīng)問題挑戰(zhàn)著橋梁工程界及風(fēng)工程界，經(jīng)過幾代人的努力，極具毀壞性的顫、馳振等氣動彈性問題已得到基本控制，抗風(fēng)理論設(shè)計可保證結(jié)構(gòu)臨界風(fēng)速高于自然橋址處最大設(shè)計風(fēng)速，在主梁、吊桿、橋塔等結(jié)構(gòu)構(gòu)件較常出現(xiàn)的渦激振動是一種低風(fēng)速下的風(fēng)振形式，，雖為限幅振動，但其往復(fù)振動形態(tài)也能嚴(yán)重影響到橋梁結(jié)構(gòu)（構(gòu)件）的疲勞，考驗著橋梁的強(qiáng)度、穩(wěn)定性能等，也影響著行人及施工人員的安全及舒適性，這些特點凸顯著對渦激振動研究的重要意義。工程人員對實際工程中的渦激振動控制具有很大程度的經(jīng)驗性，往往通過大規(guī)模的嘗試性試驗進(jìn)行渦激振動的措施制振控制。引起渦激振動的敏感因素很多，極其復(fù)雜，使得試驗帶有很大的盲目性，假使已知斷面的某個具體部位控制著渦激振動的發(fā)生，再進(jìn)行針對性的斷面改進(jìn)勢必起到事半功倍的效果。 本文以某典型鈍體斷面為研究載體，采集節(jié)段梁體模型風(fēng)洞試驗過程中的時程加速度數(shù)據(jù)及時程壓力數(shù)據(jù)，進(jìn)而分析采集數(shù)據(jù)的相關(guān)參數(shù)（位移值、壓力系數(shù)脈動值、氣動力貢獻(xiàn)值、氣動力卓越頻率值、功率譜密度值、相位譜值等）。從時域、頻域兩個角度分別討論渦激振動特性；重點推理闡明了邊界層氣流漩渦成分周期性脫落激勵渦激運動的能量積聚關(guān)鍵區(qū)域：基于不同攻角模型梁體的試驗響應(yīng)揭示豎彎渦振特性；依托不同透風(fēng)形式欄桿模型的試驗響應(yīng)闡述扭轉(zhuǎn)渦激振動特性。
[Abstract]:The weak damping, long, fine, light and flexible is the main trend of the development direction of the bridge. The dynamic response of the bridge structure (component) challenges the bridge engineering and the wind engineering circles. After several generations of efforts, the aeroelastic problems such as extremely destructive tremor and galloping have been basically controlled, and the wind resistance theory is designed to ensure that the critical wind speed of the structure is higher than the natural bridge. The maximum design wind speed is located at the site. The vortex vibration of the structural members, such as the main beam, the hanger and the bridge tower, is a form of wind vibration under the low wind speed. Although it is the amplitude limiting vibration, its reciprocating vibration can also seriously affect the fatigue of the bridge structure (component), test the strength of the bridge, stabilize the performance and so on, and also affect the pedestrian and the construction personnel. Safety and comfort, these features highlight the significance of the study of vortex induced vibration. Engineers have a great degree of Empiricism on the vortex induced vibration control in practical engineering, and often control the vibration of vortex induced vibration by large-scale trial tests. The test has a lot of blindness, if a specific part of the known section controls the occurrence of vortex induced vibration, and then the targeted section improvement is bound to be twice the result of half the effort.
In this paper, a typical blunt body section is used as the research carrier to collect the time history pressure data of the time range acceleration data during the wind tunnel test of the segmental beam body model, and then analyze the relevant parameters of the collected data (displacement, pressure coefficient pulsation value, aerodynamic contribution value, aerodynamic remarkable frequency value, power spectrum density value, phase spectrum value, etc.). The characteristics of vortex induced vibration are discussed in the two angles of the frequency domain. The key reasoning is to clarify the key area of energy accumulation in the periodic exfoliating vortex excitation of the boundary layer. The experimental response of the beam body based on the different angle of attack reveals the characteristics of the vertical bending vortex vibration. Characteristics of vortex induced vibration.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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