本文選題：現(xiàn)場實(shí)測　切入點(diǎn)：主梁斷面　出處：《湖南科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：對于橋梁結(jié)構(gòu)而言，風(fēng)荷載是進(jìn)行結(jié)構(gòu)設(shè)計(jì)的重要控制荷載之一。橋梁結(jié)構(gòu)因風(fēng)的作用而遭到破壞的事故屢見不鮮。隨著橋梁跨徑的進(jìn)一步增大，橋梁結(jié)構(gòu)對風(fēng)的作用更加敏感，風(fēng)荷載作用下橋梁結(jié)構(gòu)的抗風(fēng)性能已成為影響其設(shè)計(jì)和施工的控制因素。因此，研究橋梁結(jié)構(gòu)在風(fēng)荷載作用下的風(fēng)壓分布規(guī)律對于結(jié)構(gòu)的抗風(fēng)設(shè)計(jì)研究起著至關(guān)重要的作用。目前，進(jìn)行結(jié)構(gòu)抗風(fēng)研究的方法主要包括三種，即：風(fēng)洞試驗(yàn)、數(shù)值模擬和現(xiàn)場實(shí)測。其中，現(xiàn)場實(shí)測采集得到的試驗(yàn)數(shù)據(jù)更加符合實(shí)際結(jié)構(gòu)動(dòng)力特性的優(yōu)點(diǎn)，是進(jìn)行結(jié)構(gòu)抗風(fēng)研究最可靠的方法。然而，因?yàn)楝F(xiàn)場實(shí)測過程中天氣條件的不可控制性和各種客觀因素的影響，目前，國內(nèi)外通過現(xiàn)場實(shí)測的方法對橋梁結(jié)構(gòu)進(jìn)行抗風(fēng)性能研究的文獻(xiàn)仍相對較少。本文以湖南省岳陽市洞庭湖大橋?yàn)橐劳泄こ�，通過現(xiàn)場實(shí)測研究主跨跨中主梁斷面以及主塔塔頂?shù)娘L(fēng)場和風(fēng)壓特性，從而為今后進(jìn)行類似大跨度橋梁結(jié)構(gòu)的抗風(fēng)設(shè)計(jì)及相關(guān)研究提供可靠的參考依據(jù)。本文的主要工作如下： 1.應(yīng)用流體傳輸管道動(dòng)力學(xué)的基本理論知識(shí)分析傳壓管路系統(tǒng)的頻響特性；設(shè)計(jì)適用于本文的風(fēng)壓測量系統(tǒng)并通過試驗(yàn)驗(yàn)證其準(zhǔn)確性，確保試驗(yàn)數(shù)據(jù)的真實(shí)可靠。 2.根據(jù)試驗(yàn)?zāi)康脑谥髁杭八斶x擇合適位置布置測點(diǎn)，完成傳壓管的鋪設(shè)并對試驗(yàn)儀器進(jìn)行調(diào)試；進(jìn)行至少兩次較為成功的風(fēng)場、風(fēng)壓觀測試驗(yàn)。 3.通過Matlab數(shù)值分析軟件對試驗(yàn)數(shù)據(jù)進(jìn)行處理，得到主梁斷面與塔頂?shù)娘L(fēng)場特性參數(shù)、風(fēng)壓分布特性、風(fēng)壓與風(fēng)場的相關(guān)性以及靜力三分力系數(shù)與風(fēng)場的相關(guān)性，并對結(jié)果進(jìn)行分析。
[Abstract]:For bridge structure, wind load is one of the important control loads for structural design. The bridge structure is more sensitive to the wind, and the wind-resistant performance of the bridge structure under the wind load has become the control factor that affects the design and construction of the bridge structure. It is very important to study the wind pressure distribution law of bridge structure under wind load. At present, there are three main methods to study the wind resistance of bridge structure, namely, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test and wind tunnel test. Numerical simulation and field measurement. Among them, the experimental data obtained from the field measurement is more in line with the advantages of the dynamic characteristics of the actual structure, and is the most reliable method for the study of structural wind resistance. Because of the uncontrollable weather conditions and the influence of various objective factors in the field measurement process, at present, There are few literatures on the wind-resistant performance of bridge structure through the method of field measurement at home and abroad. This paper is based on the Dongting Lake Bridge in Yueyang City, Hunan Province. The wind field and wind pressure characteristics of the cross section of the main girder and the top of the main tower tower are studied in situ, thus providing a reliable reference for the wind resistant design and related research of similar long-span bridge structures in the future. The main work of this paper is as follows:. 1. The frequency response characteristics of the pressure transmission pipeline system are analyzed by using the basic theoretical knowledge of fluid transfer pipeline dynamics, and the wind pressure measurement system is designed and verified by experiments to ensure the reliability of the test data. 2. According to the purpose of the test, the proper position of the main beam and the top of the tower is chosen to lay out the pressure transfer pipe and to debug the test instrument, and at least two successful wind field and wind pressure observation tests are carried out. 3. The test data are processed by Matlab software, and the parameters of wind field characteristic, wind pressure distribution, the correlation between wind pressure and wind field and the correlation between static three-point force coefficient and wind field are obtained. The results were analyzed.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.27

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