本文選題：山區(qū)地形 + 風場特性　； 參考：《大連理工大學》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。風荷載是大跨度橋梁的一項非常重要的、甚至對結構設計起控制作用的荷載。因此,山區(qū)風場特性的準確確定對山區(qū)大跨度橋梁施工和運營階段的抗風設計起著至關重要的作用。本文采用風洞試驗方法,研究了八種典型簡單二維山體(單體)干擾條件下的風場特性,考慮了風偏角以及多重山脈干擾條件下的風場特性。本文主要工作內容和結論如下：(1)第一章按研究方法進行分類,從風洞試驗、數(shù)值模擬、現(xiàn)場實測三個方面,對國內外山區(qū)橋址風場特性的研究現(xiàn)狀進行了詳細深入的分析、歸納和總結。進而簡要介紹了本文研究內容及意義。(2)第二章主要從平均風特性和脈動風特性兩方面介紹了山區(qū)風場特性的主要研究內容和相關理論知識,為后文研究提供了理論支持。(3)第三章介紹了本文風洞試驗中采用的試驗模型、試驗方案、試驗工況以及試驗數(shù)據(jù)處理方法,并進行了試驗誤差分析。(4)第四章分析了單個半圓形山體的風場特性、對比分析了多種典型的二維山體的風場特性以及不同風偏角對山體風場特性的影響。分析結果表明,三角形山體和梯形山體對山體前、后方一定區(qū)域內風場特性的影響大于半圓形山體,且迎風面坡度越大,影響越顯著,表現(xiàn)為遮擋效應更顯著、風攻角和紊流強度更大,山體后方的脈動成分更多。(5)第五章分析了多重山脈干擾條件下的風場特性,并提出了進行山區(qū)橋梁抗風設計與研究的幾點建議。分析結果表明,相比單個山體,兩個相距2倍山體高度的山體,山頂處的加速效應有所減弱、山體后方風速的遮擋效應影響區(qū)域有所增大；在靠近后方山體背風面山腳處,風速和風攻角脈動相對較大。三角形山體比半圓形山體遮擋效應更顯著,范圍也更大。兩個相距一定距離的山體,后方山體對其前方4倍山體高度距離處的風場特性有一定的影響,表現(xiàn)為風速減小、風攻角增大,紊流強度增大。(6)最后進行了總結,給出了相關的結論和展望。
[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.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442

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本文編號：1945583