發(fā)布時(shí)間：2018-01-16 10:13

  本文關(guān)鍵詞：大跨度橋梁鋼箱梁外表面風(fēng)壓實(shí)測(cè)與研究　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 風(fēng)壓傳感器 鋼箱梁表面 實(shí)測(cè) 風(fēng)攻角 風(fēng)偏角

【摘要】：為了獲得風(fēng)對(duì)流線型扁平鋼箱梁表面的壓力大小和分布規(guī)律的第一手資料，沿廈漳跨海大橋跨中的主梁橫截面的檢修道、風(fēng)嘴和梁底布設(shè)若干風(fēng)壓傳感器，現(xiàn)場(chǎng)實(shí)測(cè)記錄風(fēng)壓數(shù)據(jù)。 本文首先總結(jié)了橋梁抗風(fēng)理論在國(guó)內(nèi)外的發(fā)展歷程和研究現(xiàn)狀，以及各國(guó)學(xué)者對(duì)結(jié)構(gòu)物外表面的風(fēng)壓實(shí)測(cè)與研究，詳細(xì)描述了鋼箱梁外表面風(fēng)壓現(xiàn)場(chǎng)測(cè)量成果。總結(jié)整理了自然風(fēng)的特性，風(fēng)對(duì)橋梁的靜力作用和動(dòng)力作用，測(cè)壓法原理，現(xiàn)場(chǎng)實(shí)測(cè)所依托廈漳跨海大橋的基本概況。介紹了風(fēng)壓測(cè)量系統(tǒng)的設(shè)計(jì)方案，對(duì)初期擬定的多個(gè)實(shí)測(cè)方案進(jìn)行了反復(fù)比較、實(shí)驗(yàn)與修正，確定最佳方案。實(shí)驗(yàn)采用風(fēng)壓傳感器和數(shù)據(jù)采集器的各種參數(shù)、數(shù)量并對(duì)測(cè)量系統(tǒng)進(jìn)行了室內(nèi)校驗(yàn)及系統(tǒng)的現(xiàn)場(chǎng)布設(shè)方案、安裝方法和采集工況等。 現(xiàn)場(chǎng)記錄良態(tài)條件下的風(fēng)壓值。研究分析了在不同風(fēng)向、風(fēng)速、風(fēng)攻角和風(fēng)偏角情況下，風(fēng)壓沿箱梁表面的大小和分布規(guī)律，并對(duì)產(chǎn)生這種分布規(guī)律的原因進(jìn)行了初步分析與推斷。發(fā)現(xiàn)風(fēng)速與箱梁表面的壓力大小成正相關(guān)關(guān)系，風(fēng)攻角是影響風(fēng)壓分布規(guī)律的主要因素，風(fēng)偏角對(duì)風(fēng)壓大小和分布規(guī)律影響不大。對(duì)比不同時(shí)距下風(fēng)壓沿箱梁分布，，發(fā)現(xiàn)風(fēng)壓值大小與時(shí)距長(zhǎng)短成反相關(guān)關(guān)系。分析箱梁在靜止和振動(dòng)狀態(tài)下的風(fēng)壓分布的異同，發(fā)現(xiàn)不同時(shí)距同一測(cè)點(diǎn)下風(fēng)壓值大小沒(méi)有明確的幾何關(guān)系，處于靜止或振動(dòng)狀態(tài)下的箱梁表面的風(fēng)壓分布趨勢(shì)一致。運(yùn)用伯努利方程和邊界層理論能夠?qū)︼L(fēng)壓沿箱梁截面的分布規(guī)律與特點(diǎn)進(jìn)行很好的解釋。與CFD和風(fēng)洞試驗(yàn)風(fēng)壓值對(duì)比，發(fā)現(xiàn)其與現(xiàn)場(chǎng)實(shí)測(cè)結(jié)果略有差別，但能夠較真實(shí)地反映風(fēng)對(duì)橋梁表面的作用。通過(guò)對(duì)風(fēng)壓值積分，計(jì)算靜力三分力系數(shù)，用實(shí)測(cè)值計(jì)算阻力系數(shù)和風(fēng)洞結(jié)果相近，但升力系數(shù)和扭矩系數(shù)兩者有很大不同，原因在于現(xiàn)場(chǎng)實(shí)測(cè)未考慮橋面行車道部位風(fēng)壓值。
[Abstract]:In order to obtain the firsthand information of wind pressure on the surface of streamlined flat steel box girder, a number of wind pressure sensors are arranged along the overhaul track of the cross section of the main girder in the middle span of Xiazhang cross sea bridge, the wind nozzles and the bottom of the beam. Field measured wind pressure data recorded. Firstly, this paper summarizes the development and research status of bridge wind resistance theory at home and abroad, as well as the measurement and research of wind pressure on the outer surface of structure by scholars from all over the world. The field measurement results of wind pressure on the external surface of steel box girder are described in detail. The characteristics of natural wind, the static and dynamic effects of wind on the bridge, and the principle of pressure measurement method are summarized. This paper introduces the design scheme of the wind pressure measurement system, and makes repeated comparison, experiment and correction of several measured schemes in the initial stage. The best scheme is determined. The parameters and quantity of wind pressure sensor and data collector are used in the experiment, and the indoor calibration of the measurement system and the field layout scheme, installation method and acquisition condition of the system are also carried out. The value of wind pressure in good condition was recorded. The size and distribution of wind pressure along the surface of box girder were studied and analyzed under different wind direction, wind speed, wind attack angle and wind deflection angle. It is found that the wind speed has a positive correlation with the pressure on the surface of the box girder, and the angle of attack is the main factor affecting the distribution of wind pressure. The wind deflection angle has little effect on the wind pressure size and distribution, and the wind pressure is distributed along the box girder at different time intervals. It is found that the wind pressure value is inversely correlated with the time distance. By analyzing the difference of wind pressure distribution between static and vibration states, it is found that there is no clear geometric relationship between the wind pressure value and the wind pressure value at the same measuring point at the same time. The distribution trend of wind pressure on the surface of box girder in static or vibration state is consistent. The distribution law and characteristics of wind pressure along the section of box girder can be well explained by using Bernoulli equation and boundary layer theory, which is similar to that of CFD and wind. Comparison of wind pressure in tunnel test. It is found that it is slightly different from the measured results, but it can truly reflect the effect of wind on the bridge surface. The static three-point force coefficient is calculated by integrating the wind pressure value. The calculated resistance coefficient is similar to the wind tunnel result, but the lift coefficient and the torque coefficient are very different, the reason is that the wind pressure value of the bridge deck carriageway is not taken into account in the field measurement.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U446

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 陳政清,柳成蔭,倪一清,王修勇,伏曉寧;洞庭湖大橋拉索風(fēng)雨振中的風(fēng)場(chǎng)參數(shù)[J];鐵道科學(xué)與工程學(xué)報(bào);2004年01期

2 李秋勝;戴益民;李正農(nóng);;強(qiáng)臺(tái)風(fēng)“黑格比”作用下低矮房屋風(fēng)壓特性[J];建筑結(jié)構(gòu)學(xué)報(bào);2010年04期

相關(guān)博士學(xué)位論文 前1條

1 陶奇;大跨斜拉橋施工狀態(tài)抖振響應(yīng)現(xiàn)場(chǎng)實(shí)測(cè)研究與分析[D];西南交通大學(xué);2010年

本文編號(hào)：1432652