本文選題：鈍體斷面 + 渦激振動��； 參考：《湖南大學(xué)》2014年碩士論文

【摘要】：我國大跨度鋼橋越來越多，研究與防止渦激振動已成為我國大跨橋梁抗風(fēng)設(shè)計的關(guān)鍵難題之一，，橋梁結(jié)構(gòu)渦激振動問題也是目前橋梁抗風(fēng)研究領(lǐng)域的熱點問題之一。目前大跨度橋梁主梁結(jié)構(gòu)渦激振動主要通過節(jié)段模型風(fēng)洞試驗檢驗，理論分析方法僅停留在二維模型階段，三維理論分析近乎空白。本文結(jié)合國家自然科學(xué)基金“大跨度橋梁主梁結(jié)構(gòu)渦激力展向相關(guān)性試驗研究”課題（資助編號：51178181），重點對鈍體主梁斷面的渦激振動響應(yīng)及渦激力的展向相關(guān)性進(jìn)行試驗研究。設(shè)計并制作寬高比為5:1的矩形斷面拉條模型，進(jìn)行不同阻尼比條件下渦激振動響應(yīng)和渦激力測試，進(jìn)而對矩形斷面高階渦振響應(yīng)規(guī)律和渦激力展向相關(guān)性進(jìn)行研究，最后按歐洲規(guī)范渦振振幅估算公式對本文試驗?zāi)Ｐ蜏u振響應(yīng)進(jìn)行了計算，并與試驗結(jié)果進(jìn)行了比較。本文主要研究內(nèi)容如下： （1）在簡要綜述大跨度橋梁渦激振動、渦激力展向相關(guān)性及多階模態(tài)渦激振動研究現(xiàn)狀的基礎(chǔ)上，考慮影響渦激振動的渦激力展向相關(guān)性、振型等因素，確定采用拉條模型風(fēng)洞試驗來研究矩形鈍體斷面渦激振動的三維效應(yīng)，并給出了本文的主要研究內(nèi)容與研究技術(shù)路線。 （2）介紹了渦激力展向相關(guān)性的基本概念及影響因素，對寬高比為5:1的矩形斷面節(jié)段模型渦激力展向相關(guān)性試驗結(jié)果進(jìn)行了數(shù)據(jù)處理與分析，并采用模型測壓結(jié)果計算渦激力，進(jìn)而對矩形斷面模型渦激振動響應(yīng)進(jìn)行計算，并與試驗測試結(jié)果進(jìn)行比較，兩者總體吻合良好。 （3）在簡要介紹拉條模型基本原理的基礎(chǔ)上，設(shè)計并制作了寬高比為5:1的矩形斷面拉條模型，并對其結(jié)構(gòu)動力特性參數(shù)進(jìn)行了測試。分別進(jìn)行了含測壓管路和不含測壓管路的拉條模型試驗，對矩形鈍體斷面三維渦激振動響應(yīng)試驗結(jié)果進(jìn)行了系統(tǒng)分析，并與按歐洲規(guī)范渦振振幅估算公式計算的不同模態(tài)進(jìn)行比較。提出了節(jié)段模型渦激力展向相關(guān)性的振型修正方法，并采用剛體節(jié)段模型渦激力展向相關(guān)性與拉條模型渦激力展向相關(guān)性試驗數(shù)據(jù)進(jìn)行了檢驗。分別對模型固定狀態(tài)和自由振動狀態(tài)下渦激力展向相關(guān)性進(jìn)行了計算。 （4）采用拉條模型試驗實測了不同風(fēng)速條件下模型由“靜止—共振”狀態(tài)響應(yīng)時程，推導(dǎo)了簡諧荷載作用下結(jié)構(gòu)“靜止—共振”響應(yīng)方程一般解，并給出了Scanlan經(jīng)驗線性和經(jīng)驗非線性渦激力模型氣動參數(shù)的識別方法。在此基礎(chǔ)上基于拉條模型試驗結(jié)果進(jìn)行了矩形斷面渦激力氣動參數(shù)識別。
[Abstract]:There are more and more long-span steel bridges in China. The research and prevention of vortex-induced vibration has become one of the key problems in wind-resistant design of long-span bridges in China. The vortex-induced vibration of bridge structures is also one of the hot issues in the field of bridge wind resistance. At present, the vortex-induced vibration of long-span bridge girder structure is mainly tested by wind tunnel test of segmental model. The theoretical analysis method is only in the stage of two-dimensional model, and the three-dimensional theoretical analysis is almost blank. In this paper, combining with the National Natural Science Foundation of China, "the experimental study on the spanned correlation of vortex-induced forces in the main girder structure of long-span bridges" (Grant No.: 51178181), the experimental study on the vortex-induced vibration response and the spanned correlation of vortex-induced forces on the main beam section of blunt body is carried out. A drawing strip model of rectangular section with a width to height ratio of 5:1 is designed and fabricated. The vortex-induced vibration response and vortex-induced force are measured under different damping ratios. The response law of high-order vortex vibration and the spanned correlation of vortex-induced forces are studied. Finally, the vortex vibration response of the test model is calculated according to the formula for estimating the amplitude of vortex vibration in the European Code, and the results are compared with the experimental results. The main contents of this paper are as follows: (1) on the basis of a brief review of the research status of vortex-induced vibration, the spanned correlation of vortex-induced forces and the multi-order modal vortex-induced vibration of long-span bridges, the spanned correlation of vortex-induced forces affecting the vortex-induced vibration is considered. The wind tunnel test of strip drawing model is used to study the three-dimensional effect of vortex-induced vibration of rectangular obtuse body. The main research contents and technical route of this paper are also given. (2) the basic concept of the spanned correlation of vortex-induced forces and its influencing factors are introduced. Based on the data processing and analysis of the spanned correlation test results of vortex-induced forces in rectangular cross-section model at 5:1 aspect ratio, the vortex-induced forces are calculated by using the model pressure measurement results, and then the vortex-induced vibration response of rectangular cross-section model is calculated. Compared with the test results, the results agree well with each other. (3) on the basis of brief introduction of the basic principle of drawing strip model, a rectangular section drawing model with a aspect ratio of 5:1 is designed and made. The dynamic characteristics of the structure are tested. Three dimensional vortex-induced vibration response test results of rectangular obtuse body are systematically analyzed. The results are compared with the different modes calculated according to the formula for estimating the amplitude of vortex vibration in the European Code. A mode correction method for the spanned correlation of vortex-induced forces in segmental model is proposed. The experimental data of spanned correlation of vortex-induced forces in rigid body model and that in strip model are used to test the spanned correlation of vortex-induced forces. The spanned correlation of vortex-induced forces in the fixed state and free vibration state of the model is calculated. (4) the response time history of the model under different wind speed conditions is measured by using the strip drawing model test, and the response time history of the model from "static to resonant" state is measured under different wind speed conditions. The general solution of the "static resonance" response equation of the structure under harmonic loading is derived, and the identification method of the aerodynamic parameters of the Scanlan empirical linear and empirical nonlinear vortex-induced force models is given. Based on the experimental results of strip drawing model, aerodynamic parameters of vortex-induced forces on rectangular section are identified.
【學(xué)位授予單位】：湖南大學(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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