發(fā)布時(shí)間：2018-05-28 06:01

  本文選題：山區(qū)地形 + 風(fēng)場(chǎng)特性��； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：近年來,在山區(qū)修建了很多大跨度橋梁。風(fēng)荷載是大跨度橋梁的一項(xiàng)非常重要的、甚至對(duì)結(jié)構(gòu)設(shè)計(jì)起控制作用的荷載。因此,山區(qū)風(fēng)場(chǎng)特性的準(zhǔn)確確定對(duì)山區(qū)大跨度橋梁施工和運(yùn)營(yíng)階段的抗風(fēng)設(shè)計(jì)起著至關(guān)重要的作用。本文采用風(fēng)洞試驗(yàn)方法,研究了八種典型簡(jiǎn)單二維山體(單體)干擾條件下的風(fēng)場(chǎng)特性,考慮了風(fēng)偏角以及多重山脈干擾條件下的風(fēng)場(chǎng)特性。本文主要工作內(nèi)容和結(jié)論如下：(1)第一章按研究方法進(jìn)行分類,從風(fēng)洞試驗(yàn)、數(shù)值模擬、現(xiàn)場(chǎng)實(shí)測(cè)三個(gè)方面,對(duì)國(guó)內(nèi)外山區(qū)橋址風(fēng)場(chǎng)特性的研究現(xiàn)狀進(jìn)行了詳細(xì)深入的分析、歸納和總結(jié)。進(jìn)而簡(jiǎn)要介紹了本文研究?jī)?nèi)容及意義。(2)第二章主要從平均風(fēng)特性和脈動(dòng)風(fēng)特性兩方面介紹了山區(qū)風(fēng)場(chǎng)特性的主要研究?jī)?nèi)容和相關(guān)理論知識(shí),為后文研究提供了理論支持。(3)第三章介紹了本文風(fēng)洞試驗(yàn)中采用的試驗(yàn)?zāi)Ｐ�、試�?yàn)方案、試驗(yàn)工況以及試驗(yàn)數(shù)據(jù)處理方法,并進(jìn)行了試驗(yàn)誤差分析。(4)第四章分析了單個(gè)半圓形山體的風(fēng)場(chǎng)特性、對(duì)比分析了多種典型的二維山體的風(fēng)場(chǎng)特性以及不同風(fēng)偏角對(duì)山體風(fēng)場(chǎng)特性的影響。分析結(jié)果表明,三角形山體和梯形山體對(duì)山體前、后方一定區(qū)域內(nèi)風(fēng)場(chǎng)特性的影響大于半圓形山體,且迎風(fēng)面坡度越大,影響越顯著,表現(xiàn)為遮擋效應(yīng)更顯著、風(fēng)攻角和紊流強(qiáng)度更大,山體后方的脈動(dòng)成分更多。(5)第五章分析了多重山脈干擾條件下的風(fēng)場(chǎng)特性,并提出了進(jìn)行山區(qū)橋梁抗風(fēng)設(shè)計(jì)與研究的幾點(diǎn)建議。分析結(jié)果表明,相比單個(gè)山體,兩個(gè)相距2倍山體高度的山體,山頂處的加速效應(yīng)有所減弱、山體后方風(fēng)速的遮擋效應(yīng)影響區(qū)域有所增大；在靠近后方山體背風(fēng)面山腳處,風(fēng)速和風(fēng)攻角脈動(dòng)相對(duì)較大。三角形山體比半圓形山體遮擋效應(yīng)更顯著,范圍也更大。兩個(gè)相距一定距離的山體,后方山體對(duì)其前方4倍山體高度距離處的風(fēng)場(chǎng)特性有一定的影響,表現(xiàn)為風(fēng)速減小、風(fēng)攻角增大,紊流強(qiáng)度增大。(6)最后進(jìn)行了總結(jié),給出了相關(guān)的結(jié)論和展望。
[Abstract]:In recent years, many long-span bridges have been built in mountainous areas. Wind load is one of the most important loads in long span bridges, and even plays a controlling role in structural design. Therefore, the accurate determination of wind field characteristics plays an important role in the wind-resistant design of long-span bridges in mountainous areas. In this paper, the wind field characteristics of eight typical simple two-dimensional mountain bodies (monomers) are studied by wind tunnel test. The wind field characteristics under the condition of wind deflection angle and multiple mountain disturbance are considered. The main contents and conclusions of this paper are as follows: the first chapter classifies according to the research method, from three aspects of wind tunnel test, numerical simulation and field measurement, makes a detailed and in-depth analysis on the research status of wind field characteristics of the bridge site in mountainous areas at home and abroad. Induction and summary. The second chapter mainly introduces the main research contents and related theoretical knowledge of wind field characteristics in mountainous areas from the two aspects of average wind characteristics and pulsating wind characteristics. The third chapter introduces the test model, scheme, working condition and data processing method used in the wind tunnel test in this paper. In chapter 4, the wind field characteristics of a single semi-circular mountain body are analyzed, and the wind field characteristics of several typical two-dimensional mountain bodies and the effects of different wind deflection angles on the wind field characteristics are compared and analyzed. The results show that the influence of triangle mountain and trapezoidal mountain on wind field in front and rear of mountain is greater than that in semicircular mountain, and the bigger the slope of upwind is, the more significant the influence is, and the more obvious is the blocking effect. The wind attack angle and turbulence intensity are greater, and the pulsating components behind the mountain are more. 5) in chapter 5, the wind field characteristics under the condition of multiple mountain disturbance are analyzed, and some suggestions for wind resistance design and research of mountain bridges are put forward. The results show that the acceleration effect at the top of the mountain is weaker than that of the single mountain, and the area affected by the wind speed at the back of the mountain is increased, and at the foot of the leeward near the rear mountain, the acceleration effect at the top of the mountain is weakened, and the area affected by the wind speed at the back of the mountain is increased. Wind speed and angle of attack are relatively large. The blocking effect of triangular mountain is more obvious than that of semi-circular mountain. Two mountains with a certain distance from each other have a certain influence on the wind field characteristics at a distance of 4 times the height of the mountain body in front of the mountain body. The wind speed decreases, the wind attack angle increases, and the turbulence intensity increases. Some conclusions and prospects are given.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442

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本文編號(hào)：1945583