本文選題：風(fēng)洞試驗(yàn) + 數(shù)值模擬�。� 參考：《長安大學(xué)》2015年碩士論文

【摘要】：隨著我國橋梁建設(shè)的不斷推進(jìn),越來越多的大跨徑橋梁以城市地標(biāo)的身份出現(xiàn)在人們面前,在其建設(shè)過程中也出現(xiàn)了各種各樣未知的難題需要橋梁建設(shè)者們?nèi)パ芯拷鉀Q,特別是橋梁建設(shè)或運(yùn)營期間所出現(xiàn)的風(fēng)致振動現(xiàn)象,已逐漸成為大跨度橋梁建設(shè)的決定性因素。當(dāng)前,橋梁工程師主要通過風(fēng)洞試驗(yàn)來解決橋梁在實(shí)際風(fēng)場中的抗風(fēng)性能等相關(guān)問題,然而,風(fēng)洞試驗(yàn)具有周期長、費(fèi)用高、基礎(chǔ)設(shè)備要求苛刻等一些客觀因素,特別是在先期風(fēng)洞試驗(yàn)結(jié)果不理想情況下所進(jìn)行的重復(fù)試驗(yàn),費(fèi)時費(fèi)力。隨著計算流體力學(xué)的發(fā)展,數(shù)值風(fēng)洞作為一種全新的研究手段,逐漸被科研工作者應(yīng)用于橋梁抗風(fēng)性能研究等相關(guān)領(lǐng)域。本文在與風(fēng)洞試驗(yàn)對比的基礎(chǔ)上,提出裝配式的主梁斷面組合設(shè)計形式,用于數(shù)值模擬下的氣動斷面選型,無論其單獨(dú)應(yīng)用抑或指導(dǎo)后期風(fēng)洞試驗(yàn),均具有重要意義。本文以某π型主梁斷面斜拉橋?yàn)楸尘?在分別進(jìn)行主梁節(jié)段模型測力、測振風(fēng)洞試驗(yàn)的基礎(chǔ)上,選取三種氣動措施進(jìn)行主梁裝配組合,通過數(shù)值模擬對比主梁靜三分力系數(shù),主梁斷面尾流特性分析,及二維斷面顫振臨界風(fēng)速值等,在無需計算橋梁動力特性的前提下進(jìn)行斷面氣動選型,選取方案可用于解決風(fēng)洞試驗(yàn)過程中可能出現(xiàn)的橋梁風(fēng)致振動現(xiàn)象,對最終主梁斷面形式的確定具有十分重要的指導(dǎo)意義。經(jīng)模擬,其結(jié)論與風(fēng)洞試驗(yàn)結(jié)果一致。此外,研究發(fā)現(xiàn)數(shù)值模擬可用于分析不同氣動措施下對繞流特性的改變,對于各氣動措施尺寸的確定亦可達(dá)到預(yù)期效果,本文方法可用于指導(dǎo)π型斷面氣動選型設(shè)計。
[Abstract]:With the continuous development of bridge construction in our country, more and more long-span bridges appear in front of people as city landmarks. In the process of construction, a variety of unknown problems need to be studied and solved by bridge builders. Especially the wind-induced vibration phenomenon in the period of bridge construction or operation has gradually become a decisive factor in the construction of long-span bridges. At present, bridge engineers mainly use wind tunnel test to solve the wind resistance performance of bridge in actual wind field. However, wind tunnel test has some objective factors, such as long period, high cost, demanding foundation equipment and so on. In particular, repeated tests are time-consuming and laborious when the results of advanced wind tunnel tests are not satisfactory. With the development of computational fluid dynamics, numerical wind tunnel, as a new research method, has been gradually applied to bridge wind resistance research and other related fields. On the basis of comparison with wind tunnel test, this paper puts forward the assembled main beam cross section combination design form, which can be used in the selection of aerodynamic section under numerical simulation, no matter whether it is used alone or to guide the later wind tunnel test, it is of great significance. In this paper, taking a 蟺 type girder section cable-stayed bridge as the background, on the basis of the model force measurement and vibration measurement wind tunnel test of the main girder segment, three kinds of pneumatic measures are selected to assemble the main girder, and the static force coefficients of the main girder are compared by numerical simulation. Based on the analysis of the wake characteristics of the main beam section and the critical flutter wind velocity of the two-dimensional section, the aerodynamic selection of the cross-section is carried out without the need to calculate the dynamic characteristics of the bridge. The selected scheme can be used to solve the wind-induced vibration of bridges during the wind tunnel test, and it is of great significance to determine the final section form of the main beam. The simulation results show that the results are consistent with those of wind tunnel test. In addition, it is found that the numerical simulation can be used to analyze the change of flow characteristics under different aerodynamic measures, and the determination of the size of each pneumatic measure can achieve the expected effect. The method in this paper can be used to guide the design of 蟺 type aerodynamic section.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442

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本文編號：1976870