本文選題：大跨橋梁 + 靜三分力系數(shù)��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：靜三分力系數(shù)曲線走向直接關(guān)系到靜風(fēng)荷載的大小，當(dāng)靜三分力曲線趨于平緩時，結(jié)構(gòu)對風(fēng)荷載的敏感程度，結(jié)構(gòu)就受風(fēng)荷載的影響就越小。研究表明：靜三分力系數(shù)與靜力穩(wěn)定問題中扭轉(zhuǎn)發(fā)散和側(cè)傾失穩(wěn)，，動力問題中的馳振、渦振和抖振都有密切關(guān)系，而關(guān)于對靜三分力系數(shù)和顫振穩(wěn)定性能關(guān)系的研究卻很少，本文主要研究靜三分力系數(shù)和顫振穩(wěn)定性能的關(guān)系，并應(yīng)用其判斷橋梁典型斷面的顫振穩(wěn)定性能及其抗風(fēng)措施的優(yōu)劣。 本文基于準(zhǔn)定常理論的頻域分析法，建立顫振導(dǎo)數(shù)和靜三分力系數(shù)的關(guān)系，然后以顫振導(dǎo)數(shù)為翹板，分析靜三分力系數(shù)對顫振過程中的氣動剛度和氣動阻尼的影響，進而得出靜三分力系數(shù)和顫振穩(wěn)定性能的關(guān)系。并且通過對顫振機理的分析，得出影響橋梁結(jié)構(gòu)顫振的關(guān)鍵氣動阻尼項，進一步分析靜三分力系數(shù)和顫振穩(wěn)定性能的關(guān)系。通過靜三分力系數(shù)和顫振穩(wěn)定性能的關(guān)系分析得出判斷大跨橋梁斷面顫振穩(wěn)定性能的F參數(shù)公式，并利用F參數(shù)來判斷典型斷面的顫振穩(wěn)定性能和評價斷面抗風(fēng)措施的優(yōu)劣。 最后本文選取大跨橋梁的幾種典型斷面，包括桁架斷面（劉家峽大橋）、閉合剛箱斷面（虎門二橋）、中央開槽斷面（西堠門大橋、港珠澳大橋）以及人行索橋（天蒙人行索橋），利用其斷面靜三分力系數(shù)來快速判斷其顫振穩(wěn)定性能或者評價抗風(fēng)措施的的優(yōu)劣。
[Abstract]:The direction of the static three-point force coefficient curve is directly related to the magnitude of the static wind load. When the static three-point force curve tends to be gentle, the sensitivity of the structure to the wind load will become smaller and the structure will be less affected by the wind load. The results show that the static three-point force coefficient is closely related to the torsional divergence and roll instability in the static stability problem, the galloping vibration, the vortex vibration and the buffeting vibration in the dynamic problem, but there is little research on the relationship between the static three-point force coefficient and the flutter stability performance. This paper mainly studies the relationship between static force coefficient and flutter stability performance, and applies it to judge the flutter stability performance of typical section of bridge and the advantages and disadvantages of wind-resistant measures. Based on the frequency domain analysis method of quasi-stationary theory, the relationship between flutter derivative and static three-point force coefficient is established, and then the influence of static three-point force coefficient on aerodynamic stiffness and damping in flutter process is analyzed with flutter derivative as tilting plate. The relationship between static force coefficient and flutter stability is obtained. Based on the analysis of flutter mechanism, the key aerodynamic damping terms affecting flutter of bridge structure are obtained, and the relationship between static force coefficient and flutter stability is further analyzed. Based on the analysis of the relationship between static force coefficient and flutter stability performance, the F parameter formula for judging flutter stability performance of long-span bridge section is obtained, and F parameters are used to judge flutter stability performance of typical section and evaluate the merits and demerits of section wind-resistant measures. Finally, several typical sections of the long-span bridge are selected, including truss section (Liujiaxia Bridge), closed rigid box section (Humen second Bridge), central slotted section (Xihoumen Bridge), Hong Kong-Zhuhai-Macao Bridge and pedestrian Cable Bridge (Tianmeng Bridge) are used to quickly judge the flutter stability and evaluate the wind-resistant measures by using the static three-point force coefficient of its section.
【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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