臺(tái)風(fēng)作用下跨海斜拉橋的失效機(jī)理
發(fā)布時(shí)間：2019-03-27 06:59
【摘要】：隨著大跨斜拉橋的快速建設(shè),橋梁的風(fēng)敏感性也不斷增大。因此,在臺(tái)風(fēng)多發(fā)地區(qū),研究臺(tái)風(fēng)風(fēng)場(chǎng)特性及其引起的橋梁失效機(jī)理具有重要的理論意義和工程價(jià)值。本文在分析了橋梁風(fēng)致破壞的幾種主要形式后,重點(diǎn)研究斜拉橋在抖振作用下的失效機(jī)理。主要研究內(nèi)容及結(jié)論如下： (1)根據(jù)臺(tái)風(fēng)的風(fēng)場(chǎng)特性,采用1949-2011年的熱帶氣旋記錄,基于Yan Meng臺(tái)風(fēng)模型,擬合出了浙江定海站的臺(tái)風(fēng)風(fēng)剖面擬合值a=0.132。并根據(jù)臺(tái)風(fēng)的脈動(dòng)風(fēng)特性選擇了Shama提出的臺(tái)風(fēng)湍流強(qiáng)度修正公式進(jìn)行湍流強(qiáng)度的計(jì)算。 (2)采用諧波疊加法,結(jié)合基于功率譜密度陣的正交分解(POD),考慮橫橋向脈動(dòng)分量和豎橋向脈動(dòng)分量的負(fù)單點(diǎn)相干性來進(jìn)行良態(tài)風(fēng)和臺(tái)風(fēng)三維風(fēng)場(chǎng)的數(shù)值模擬。良態(tài)風(fēng)的風(fēng)譜選擇《公路橋梁抗風(fēng)設(shè)計(jì)規(guī)范》(JTG/TD60-01—2004)推薦的Kaimal橫橋向譜和Panofsky-McCormick豎橋向譜,順橋向譜選用對(duì)應(yīng)的Kaimal譜；臺(tái)風(fēng)風(fēng)譜選用根據(jù)實(shí)測(cè)擬合的臺(tái)風(fēng)譜,順橋向譜與良態(tài)風(fēng)一致。 (3)應(yīng)用CFD二維流體數(shù)值模擬計(jì)算斜拉橋主梁從-10。到10。的三分力系數(shù),繪制三分力系數(shù)曲線。應(yīng)用三維流體數(shù)值模擬計(jì)算橋塔的阻力系數(shù),得到橋塔7個(gè)控制斷面的阻力系數(shù)。在ANSYS中建立斜拉橋的有限元模型,對(duì)于抖振力的氣動(dòng)導(dǎo)納采用等效風(fēng)譜法,而自激力的添加則在ANSYS中編程進(jìn)行實(shí)現(xiàn)。 (4)對(duì)兩種不同風(fēng)場(chǎng)下的斜拉橋分別進(jìn)行主梁和斜拉索的抖振分析。計(jì)算結(jié)果顯示,臺(tái)風(fēng)作用下橋梁的位移風(fēng)振系數(shù)比良態(tài)風(fēng)的大；且臺(tái)風(fēng)作用下橋梁主跨跨中處的豎橋向位移風(fēng)振系數(shù)特別大,值得引起注意。無論在在良態(tài)風(fēng)還是臺(tái)風(fēng)作用下,斜拉索的強(qiáng)度安全是有保障的。同樣的風(fēng)速下臺(tái)風(fēng)風(fēng)場(chǎng)作用下的斜拉索疲勞損傷遠(yuǎn)遠(yuǎn)大于良態(tài)風(fēng)風(fēng)場(chǎng)的疲勞損傷；臺(tái)風(fēng)作用下隨著風(fēng)速的增大斜拉索的疲勞損傷顯著增大,斜拉索的疲勞損傷對(duì)風(fēng)速十分敏感。
[Abstract]:With the rapid construction of long-span cable-stayed bridges, the wind sensitivity of bridges is increasing. Therefore, it is of great theoretical significance and engineering value to study the characteristics of typhoon wind field and the mechanism of bridge failure caused by typhoon in the areas where typhoons occur frequently. This paper focuses on the failure mechanism of cable-stayed bridges under buffeting after analyzing several main forms of wind-induced failure of bridges. The main research contents and conclusions are as follows: (1) according to the characteristics of typhoon wind field, using the tropical cyclone records from 1999 to 2011 and based on typhoon Yan Meng model, the fitting value of typhoon wind profile of Dinghai Station, Zhejiang Province, is fitted to a = 0.132. According to the fluctuating wind characteristics of typhoon, the correction formula of typhoon turbulence intensity proposed by Shama is selected to calculate the turbulence intensity. (2) numerical simulation of three-dimensional wind field of good state wind and typhoon is carried out by harmonic superposition method combined with orthogonal decomposition of (POD), based on power spectral density matrix considering negative single point coherence of transverse and vertical fluctuating components. The wind spectrum of good state wind is selected in the Code of Design for Wind Resistance of Highway Bridges (JTG/TD60-01-2004). The Kaimal transverse bridge spectrum and the Panofsky-McCormick vertical bridge spectrum recommended by the Code of Design for Wind Resistance of Highway Bridges (Kaimal) are selected, and the corresponding Kaimal spectra are selected along the bridge direction spectrum. Typhoon wind spectrum is selected according to the measured typhoon spectrum, along the bridge spectrum is consistent with the good wind. (3) using CFD two-dimensional fluid numerical simulation to calculate the main beam slave-10 of cable-stayed bridge. To 10. The curve of three-component force coefficient is drawn. The three-dimensional fluid numerical simulation is used to calculate the resistance coefficient of the bridge tower, and the resistance coefficients of the seven control sections of the bridge tower are obtained. The finite element model of cable-stayed bridge is established in ANSYS. The equivalent wind spectrum method is used for the aerodynamic admittance of buffeting force, and the addition of self-excitation force is realized by programming in ANSYS. (4) the buffeting analysis of two kinds of cable-stayed bridges with different wind fields is carried out. The results show that the displacement wind vibration coefficient of the bridge under the action of typhoon is higher than that of the good wind, and the wind vibration coefficient of the vertical displacement at the middle of the main span of the bridge under the action of typhoon is very large, which deserves attention. No matter under the action of good wind or typhoon, the strength safety of stay cables is guaranteed. Under the same wind speed, the fatigue damage of cable under the action of typhoon wind field is much greater than that of good wind field, and the fatigue damage of cable under the action of typhoon increases obviously with the increase of wind speed, and the fatigue damage of cable is very sensitive to wind speed.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27
本文編號(hào)：2447967
[Abstract]:With the rapid construction of long-span cable-stayed bridges, the wind sensitivity of bridges is increasing. Therefore, it is of great theoretical significance and engineering value to study the characteristics of typhoon wind field and the mechanism of bridge failure caused by typhoon in the areas where typhoons occur frequently. This paper focuses on the failure mechanism of cable-stayed bridges under buffeting after analyzing several main forms of wind-induced failure of bridges. The main research contents and conclusions are as follows: (1) according to the characteristics of typhoon wind field, using the tropical cyclone records from 1999 to 2011 and based on typhoon Yan Meng model, the fitting value of typhoon wind profile of Dinghai Station, Zhejiang Province, is fitted to a = 0.132. According to the fluctuating wind characteristics of typhoon, the correction formula of typhoon turbulence intensity proposed by Shama is selected to calculate the turbulence intensity. (2) numerical simulation of three-dimensional wind field of good state wind and typhoon is carried out by harmonic superposition method combined with orthogonal decomposition of (POD), based on power spectral density matrix considering negative single point coherence of transverse and vertical fluctuating components. The wind spectrum of good state wind is selected in the Code of Design for Wind Resistance of Highway Bridges (JTG/TD60-01-2004). The Kaimal transverse bridge spectrum and the Panofsky-McCormick vertical bridge spectrum recommended by the Code of Design for Wind Resistance of Highway Bridges (Kaimal) are selected, and the corresponding Kaimal spectra are selected along the bridge direction spectrum. Typhoon wind spectrum is selected according to the measured typhoon spectrum, along the bridge spectrum is consistent with the good wind. (3) using CFD two-dimensional fluid numerical simulation to calculate the main beam slave-10 of cable-stayed bridge. To 10. The curve of three-component force coefficient is drawn. The three-dimensional fluid numerical simulation is used to calculate the resistance coefficient of the bridge tower, and the resistance coefficients of the seven control sections of the bridge tower are obtained. The finite element model of cable-stayed bridge is established in ANSYS. The equivalent wind spectrum method is used for the aerodynamic admittance of buffeting force, and the addition of self-excitation force is realized by programming in ANSYS. (4) the buffeting analysis of two kinds of cable-stayed bridges with different wind fields is carried out. The results show that the displacement wind vibration coefficient of the bridge under the action of typhoon is higher than that of the good wind, and the wind vibration coefficient of the vertical displacement at the middle of the main span of the bridge under the action of typhoon is very large, which deserves attention. No matter under the action of good wind or typhoon, the strength safety of stay cables is guaranteed. Under the same wind speed, the fatigue damage of cable under the action of typhoon wind field is much greater than that of good wind field, and the fatigue damage of cable under the action of typhoon increases obviously with the increase of wind speed, and the fatigue damage of cable is very sensitive to wind speed.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27
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