本文選題：臺(tái)風(fēng)　切入點(diǎn)：抖振　出處：《西南交通大學(xué)》2015年碩士論文

【摘要】：大跨度梁在實(shí)際工程中被日益廣泛地采用,橋梁建設(shè)也朝著“超大跨度、高柔度”跨海大橋的方向發(fā)展,掀起一股橋梁技術(shù)發(fā)展革新的新浪潮。臺(tái)風(fēng)作為“研究資料少、破壞強(qiáng)度大”的一種特殊風(fēng)荷載已引起越來(lái)越多橋梁抗風(fēng)學(xué)者的關(guān)注。國(guó)內(nèi)外學(xué)者近年來(lái)也做了大量研究,取得的成果頗受矚目；但在臺(tái)風(fēng)對(duì)橋梁結(jié)構(gòu)作用方面仍有許多不足,值得進(jìn)行更為深入的研究,從而達(dá)到為超大跨橋梁的建設(shè)提供指導(dǎo)的目的。本研究根據(jù)實(shí)測(cè)臺(tái)風(fēng)風(fēng)速功率譜,采用WRFieldSimu軟件模擬臺(tái)風(fēng)脈動(dòng)風(fēng)速場(chǎng),并使用ANSYS中的瞬態(tài)動(dòng)力分析功能來(lái)計(jì)算斜拉橋模型在臺(tái)風(fēng)和內(nèi)陸風(fēng)作用下的抖振響.應(yīng)。首先,綜述臺(tái)風(fēng)模型研究的發(fā)展,同時(shí)對(duì)臺(tái)風(fēng)和內(nèi)陸風(fēng)的風(fēng)場(chǎng)特性進(jìn)行分析,對(duì)比兩種不同特性的脈動(dòng)風(fēng)在風(fēng)剖面系數(shù)、湍流度、湍流積分尺度、脈動(dòng)風(fēng)功率譜和空間相關(guān)性等方面的不同,確定本研究所采用的臺(tái)風(fēng)脈動(dòng)風(fēng)功率譜。其次,確定隨機(jī)風(fēng)速場(chǎng)的模擬方法及本研究采用的風(fēng)場(chǎng)參數(shù)和抖振力模型。對(duì)目標(biāo)譜和WRFieldSimu軟件模擬得到的生成譜進(jìn)行對(duì)比校核。再次,在西南交通大學(xué)XNJD-1工業(yè)風(fēng)洞進(jìn)行節(jié)段模型風(fēng)洞試驗(yàn),測(cè)定某斜拉橋主梁的三分力系數(shù)。并采用國(guó)際通用的有限元分析軟件ANSYS建立整體有限元模型；同時(shí)明確在計(jì)算模型中抖振力荷載的加載方式。最后,應(yīng)用ANSYS中的瞬態(tài)動(dòng)力分析功能對(duì)主跨532m斜拉橋的抖振響應(yīng)進(jìn)行計(jì)算研究。對(duì)該斜拉橋在臺(tái)風(fēng)和內(nèi)陸風(fēng)作用下進(jìn)行抖振分析,且比較了不同風(fēng)速不同攻角情況下有限元模型的抖振響應(yīng)情況。本研究確定了空間相關(guān)性對(duì)風(fēng)場(chǎng)特性的影響,表明了工程實(shí)踐中應(yīng)考慮實(shí)測(cè)沿海強(qiáng)風(fēng)地區(qū)的風(fēng)場(chǎng)特性,以此為根據(jù)來(lái)做抗風(fēng)設(shè)計(jì)。本文工作對(duì)進(jìn)一步研究大跨度橋梁在臺(tái)風(fēng)條件下的抗風(fēng)設(shè)計(jì)有一定的參考價(jià)值。
[Abstract]:Long span beams are increasingly widely used in practical projects, and bridge construction is also developing towards the direction of "super span, high flexibility" cross-sea bridge, which sets off a new wave of technological development and innovation of bridges. A special wind load with high damage intensity has attracted the attention of more and more bridge wind-resistant scholars. Scholars at home and abroad have also done a lot of research in recent years, and the results obtained have attracted considerable attention, but there are still many deficiencies in the effect of typhoons on bridge structures. It is worthy of further study to provide guidance for the construction of super-span bridges. According to the measured wind speed power spectrum of typhoon, the WRFieldSimu software is used to simulate the wind velocity field of typhoon pulsation. The transient dynamic analysis function of ANSYS is used to calculate the buffeting response of the cable-stayed bridge model under the action of typhoon and inland wind. Firstly, the development of typhoon model is reviewed, and the wind field characteristics of typhoon and inland wind are analyzed. Comparing the differences of wind profile coefficient, turbulence degree, turbulence integral scale, pulsating wind power spectrum and spatial correlation between two different characteristics of pulsating wind, the typhoon pulsating wind power spectrum used in this study is determined. The simulation method of random wind speed field and the wind field parameters and buffeting force model used in this study are determined. The target spectrum and the generated spectrum obtained by WRFieldSimu software simulation are compared and checked. The section model wind tunnel test was carried out in XNJD-1 industrial wind tunnel of Southwest Jiaotong University, and the three-point force coefficient of the main girder of a cable-stayed bridge was measured. The integral finite element model was established by using the international general finite element analysis software ANSYS. At the same time, the loading mode of buffeting load in the calculation model is determined. Finally, The buffeting response of the main span 532m cable-stayed bridge is calculated by using the transient dynamic analysis function of ANSYS. The buffeting analysis of the cable-stayed bridge under the action of typhoon and inland wind is carried out. The buffeting response of the finite element model with different wind speeds and different angles of attack is compared. The effect of spatial correlation on wind field characteristics is determined, which indicates that the measured wind field characteristics in coastal strong wind regions should be considered in engineering practice. The work of this paper has some reference value for further study on the wind-resistant design of long-span bridges under typhoon conditions.
【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】：2015
【分類號(hào)】：U441.3

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