發(fā)布時(shí)間：2018-06-12 00:47

  本文選題：鈍體箱型斷面 + 雙幅橋��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：隨著西北地區(qū)經(jīng)濟(jì)與交通急劇發(fā)展，，雙幅連續(xù)鋼構(gòu)橋在設(shè)計(jì)時(shí)越來橋越受到設(shè)計(jì)者的青睞。而在西北地區(qū)，橋梁多跨越深谷溝壑，在此地形上的橋梁受到風(fēng)的影響較為嚴(yán)重。連續(xù)剛構(gòu)橋多采用鈍體箱型斷面，氣動(dòng)性能相比流線型扁平梁及桁式梁橋差，兩幅橋斷面之間的氣動(dòng)干擾更為明顯。因此針對(duì)鈍體箱型斷面之間氣動(dòng)力系數(shù)的研究具有實(shí)際意義。 本文結(jié)合西北地區(qū)某一典型雙幅連續(xù)鋼構(gòu)橋采用數(shù)值模擬的方法計(jì)算得到各控制斷面的三分力系數(shù)，并轉(zhuǎn)化為干擾因子定量分析其氣動(dòng)干擾效應(yīng)。分析計(jì)算結(jié)果得到：雙幅上下游橋面尤其下游橋面相對(duì)單幅橋面之間存在較為明顯的氣動(dòng)干擾效應(yīng)。單幅橋面主梁寬度一定高度不同時(shí)，阻力系數(shù)隨寬高比的增大而減小，而升力系數(shù)、扭矩系數(shù)并無統(tǒng)一規(guī)律。對(duì)于雙幅橋面，隨斷面高度增加，阻力系數(shù)的干擾效應(yīng)影響增強(qiáng)，而升力系數(shù)及扭矩系數(shù)影響隨斷面高度變化規(guī)律不明顯，但相對(duì)于單幅斷面而言，總體上下游橋面的繞流氣動(dòng)干擾效應(yīng)較為顯著。因此，在該類鈍體箱型截面連續(xù)鋼構(gòu)橋設(shè)計(jì)時(shí)，雙幅主梁之間的氣動(dòng)干擾效應(yīng)不可忽略，設(shè)計(jì)時(shí)針對(duì)典型斷面之間的干擾必須進(jìn)行專門的研究分析。 在計(jì)算結(jié)果基礎(chǔ)上，本文采用測壓方法得出計(jì)算斷面壓力系數(shù)均值和根方差值的分布圖，并對(duì)關(guān)鍵測點(diǎn)做頻譜分析，結(jié)合各個(gè)工況下的壓力云圖和渦量圖從微觀層面對(duì)雙幅橋面間的氣動(dòng)干擾效應(yīng)進(jìn)行解釋。
[Abstract]:With the rapid development of economy and traffic in Northwest China, the design of two-piece continuous steel bridges is more and more popular with designers. In Northwest China, bridges often span deep valleys and gullies, and bridges in this terrain are seriously affected by wind. The continuous rigid frame bridges usually use blunt body box section. The aerodynamic performance of continuous rigid frame bridges is worse than that of streamlined flat beams and truss girder bridges, and the aerodynamic interference between the two sections is more obvious. Therefore, it is of practical significance to study aerodynamic coefficients between blunt body box sections. In this paper, the three-point force coefficients of each control section are calculated by numerical simulation method combined with a typical double-piece continuous steel bridge in Northwest China. The aerodynamic interference effect is analyzed quantitatively by transforming it into a disturbance factor. The results of analysis and calculation show that there is obvious aerodynamic interference between the upper and downstream deck, especially between the downstream deck and the single deck. The resistance coefficient decreases with the increase of the ratio of width to height, but the lift coefficient and torque coefficient have no uniform rule. For double deck, the interference effect of drag coefficient increases with the increase of cross-section height, but the influence of lift coefficient and torque coefficient on cross-section height is not obvious. As a whole, the aerodynamic interference around the upper and lower deck of the bridge is obvious. Therefore, in the design of this kind of continuous steel bridge with blunt body box section, the aerodynamic interference effect between the two main beams should not be ignored, and the interference between typical sections must be studied and analyzed in the design. In this paper, the distribution map of the mean and root variance of the cross section pressure coefficient is obtained by using the method of pressure measurement, and the spectrum analysis of the key measuring points is made. Combined with the pressure cloud map and vorticity diagram under various working conditions, the aerodynamic interference effect between the two bridge decks is explained from the microscopic level.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.3

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本文編號(hào)：2007453