發(fā)布時(shí)間：2018-06-06 18:27

  本文選題：大跨貓道 + 靜風(fēng)穩(wěn)定性�。� 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)社會(huì)的飛速發(fā)展及各項(xiàng)技術(shù)的不斷成熟進(jìn)步,懸索橋的設(shè)計(jì)與建造正向超大跨度方向發(fā)展。與此同時(shí),懸索橋施工過(guò)程中的重要臨時(shí)結(jié)構(gòu)—施工貓道也越來(lái)越輕盈,跨度越來(lái)越大。在大跨輕盈結(jié)構(gòu)中,風(fēng)荷載作用下的靜力穩(wěn)定及動(dòng)力響應(yīng)問(wèn)題是重要的研究對(duì)象。由于懸索橋上部結(jié)構(gòu)施工屬高空作業(yè),貓道所受風(fēng)荷載較大,另外貓道作為整個(gè)懸索橋上部結(jié)構(gòu)的施工平臺(tái),使用周期比較長(zhǎng),風(fēng)對(duì)貓道的影響比較明顯。為了保證施工貓道的抗風(fēng)穩(wěn)定性和施工安全,為施工人員提供一個(gè)舒適的操作平臺(tái),對(duì)大跨施工貓道進(jìn)行抗風(fēng)穩(wěn)定及施工舒適性評(píng)價(jià)可以為以后超大跨徑懸索橋施工貓道的相關(guān)研究提供依據(jù)和借鑒。本文利用西南交通大學(xué)工業(yè)風(fēng)洞實(shí)驗(yàn)室,以某大跨懸索橋施工貓道作為研究對(duì)象,測(cè)試了其在均勻流條件下的三分力系數(shù);初始位移激勵(lì)下,貓道豎彎和扭轉(zhuǎn)兩自由度耦合振動(dòng),結(jié)合利用最小二乘復(fù)指數(shù)方法(簡(jiǎn)稱LSCE法)識(shí)別出貓道的顫振導(dǎo)數(shù);通過(guò)大型有限元分析軟件ANSYS編制相關(guān)命令流,利用貓道節(jié)段模型靜力三分力試驗(yàn)結(jié)果,對(duì)貓道進(jìn)行了非線性抗風(fēng)靜力穩(wěn)定性分析;結(jié)合識(shí)別出的顫振導(dǎo)數(shù),利用MATLAB軟件計(jì)算分析貓道在脈動(dòng)風(fēng)作用下的抖振響應(yīng),得到貓道抖振動(dòng)力響應(yīng)的相關(guān)特點(diǎn);參考英國(guó)相關(guān)標(biāo)準(zhǔn)對(duì)施工貓道進(jìn)行施工舒適性評(píng)價(jià)。研究結(jié)果表明,該懸索橋貓道靜風(fēng)穩(wěn)定性滿足設(shè)計(jì)要求,且豎向、橫向位移較大的位置均出現(xiàn)在中跨貓道,扭轉(zhuǎn)角較大值雖然也出現(xiàn)在中跨貓道,但因橫向通道的影響并不是中跨貓道1/2跨位置處,而是在文中標(biāo)記的HT3和HT4之間的小跨跨中(ZX2);施工階段常遇風(fēng)速和設(shè)計(jì)風(fēng)速下的貓道抖振響應(yīng)豎向位移及扭轉(zhuǎn)角RMS值最大處位于中跨1/4處,橫向位移RMS值最大處位于中跨1/2處,而豎、橫向加速度RMS值最大處在施工常遇風(fēng)速下位于中跨1/2處,在設(shè)計(jì)風(fēng)速下位于中跨1/4處;在可施工風(fēng)速情況下,參考英國(guó)相關(guān)標(biāo)準(zhǔn),貓道豎向與橫向晝間振動(dòng)劑量未超限,夜間振動(dòng)劑量超限,即貓道晝間施工舒適性可以滿足要求,夜間則不能完全滿足。故建議夜間風(fēng)速較大時(shí)不進(jìn)行長(zhǎng)時(shí)間施工。
[Abstract]:With the rapid development of economy and society and the development of various technologies, the design and construction of suspension bridge is developing in the direction of super span. At the same time, the construction catwalk, which is an important temporary structure in the construction process of suspension bridge, is becoming more and more light and span. In long-span lightweight structures, the static stability and dynamic response under wind load are important research objects. Because the superstructure construction of suspension bridge belongs to aerial work, the catwalk is subjected to large wind load. In addition, as the construction platform of the whole suspension bridge superstructure, the use period of the catwalk is longer, and the influence of wind on cat track is obvious. In order to ensure the wind stability and construction safety of the construction catwalk, it provides a comfortable operating platform for the construction personnel. The evaluation of wind stability and construction comfort of long-span catwalk construction can provide the basis and reference for the related research on the construction of catwalk of long-span suspension bridge in the future. In this paper, using the laboratory of industrial wind tunnel of Southwest Jiaotong University, taking a long span suspension bridge construction catwalk as the research object, the three-point force coefficient under uniform flow condition and initial displacement excitation are tested. Combined with the coupled vibration of vertical bending and torsion of cat track, the flutter derivative of cat track is identified by using the least square complex exponent method (LSCE), and the relevant command flow is compiled by ANSYS, a large-scale finite element analysis software. Based on the static three-point test results of the catwalk segment model, the nonlinear wind-resistant static stability of the catwalk is analyzed, and the chattering response of the catwalk under pulsating wind is calculated and analyzed by using MATLAB software combined with the recognized flutter derivative. The characteristics of buffeting dynamic response of the catwalk are obtained, and the construction comfort of the catwalk is evaluated by referring to the relevant British standards. The results show that the static wind stability of the catwalk of the suspension bridge meets the design requirements, and the positions with large vertical and transverse displacement appear in the mid-span catwalk, and the larger torsion angle also appears in the mid-span catwalk. But because of the transversal passage, it's not a 1 / 2 cross position in the middle of a catwalk. The maximum vertical displacement and torsion angle of catwalk buffeting response under wind speed and design wind speed are located at 1 / 4 of middle span, and the maximum value of lateral displacement RMS is located at 1 / 2 of middle span. The vertical, transverse acceleration RMS value is located at 1 / 2 of the middle span under the normal wind speed, and at 1 / 4 of the middle span under the design wind speed. In the case of the constructible wind speed, and with reference to the relevant British standards, the vertical and transverse diurnal vibration doses of the catwalk are not exceeded. The night vibration dose exceeds the limit, that is, the daytime construction comfort can meet the requirements, but at night it can not be completely satisfied. Therefore, it is suggested that no long-term construction should be carried out when the wind speed is large at night.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445

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