發(fā)布時(shí)間：2018-03-01 02:13

  本文關(guān)鍵詞： 橋墩 橋塔 桁架主梁 三維數(shù)值模擬 風(fēng)屏障　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：處于強(qiáng)側(cè)風(fēng)環(huán)境中的跨海大橋,其結(jié)構(gòu)繞流可能導(dǎo)致風(fēng)速突變,對(duì)行車安全十分不利。為此本文分別以某箱梁橋和桁架橋?yàn)檠芯繉?duì)象,探究側(cè)風(fēng)環(huán)境下橋墩、橋塔對(duì)橋面風(fēng)環(huán)境的影響及該區(qū)域風(fēng)屏障的作用。本文主要研究工作如下：1.利用計(jì)算流體動(dòng)力學(xué)(CFD)方法,借助FLUENT軟件對(duì)箱梁主梁及橋墩進(jìn)行三維數(shù)值模擬。通過風(fēng)速云圖、三維風(fēng)速分布圖,初步對(duì)橋墩的影響規(guī)律進(jìn)行定性分析。對(duì)比橋面上不同車道的風(fēng)剖面,研究橋墩附近風(fēng)屏障的防風(fēng)效果�？疾祜L(fēng)速順橋向變化,探究橋墩在順橋向及高度方向的影響范圍及規(guī)律。2.運(yùn)用FLUENT軟件,建立桁架主梁及橋塔的三維仿真模型。通過試算及風(fēng)洞試驗(yàn)資料,確定合理的計(jì)算參數(shù),計(jì)算不同工況下橋面風(fēng)速。分析橋塔對(duì)公路、鐵路橋面風(fēng)速的影響范圍,以及風(fēng)屏障透風(fēng)率對(duì)橋塔區(qū)域風(fēng)速的影響。通過與風(fēng)洞試驗(yàn)結(jié)果的對(duì)比,驗(yàn)證計(jì)算的可靠性。橋墩附近橋面風(fēng)環(huán)境的研究表明：橋墩附近橋面風(fēng)速出現(xiàn)折減,隨著高度增加,橋墩對(duì)橋面風(fēng)環(huán)境的影響范圍縮小。來流風(fēng)速的變化對(duì)橋面上方風(fēng)場(chǎng)分布規(guī)律的影響較有限；風(fēng)屏障及護(hù)欄的透風(fēng)率對(duì)迎風(fēng)側(cè)車道橋面流場(chǎng)具有顯著的影響,對(duì)背風(fēng)側(cè)車道流場(chǎng)影響相對(duì)較弱；風(fēng)屏障弱化了風(fēng)速在橋墩附近的突變效應(yīng),降低了行車高度范圍內(nèi)的風(fēng)速；橋塔附近橋面風(fēng)環(huán)境的研究表明：無風(fēng)屏障時(shí),公路橋面風(fēng)速在橋塔兩側(cè)急劇增大,然后趨于平緩；離橋塔越遠(yuǎn),風(fēng)屏障有效作用高度越高；有風(fēng)屏障工況下,公路、鐵路橋面上橋塔對(duì)風(fēng)場(chǎng)的影響范圍分別位于順橋向橋塔兩側(cè)25m、15m區(qū)域。鐵路橋面上風(fēng)屏障透風(fēng)率越小,風(fēng)速突變?cè)絼×摇?br/>[Abstract]:In the strong cross-wind environment, the structure of cross-sea bridge may lead to sudden changes in wind speed, which is very unfavorable to traffic safety. Therefore, a box girder bridge and a truss bridge are taken as research objects in this paper to explore the pier under crosswind environment. The influence of bridge tower on the wind environment of bridge deck and the effect of wind barrier on the bridge deck. The main work of this paper is as follows: 1. By using computational fluid dynamics (CFD) method and FLUENT software, the main girder and pier of box girder are simulated by 3D numerical method. Three-dimensional wind speed distribution map, preliminary qualitative analysis of the influence of piers. Comparing the wind profiles of different lanes on the bridge deck, the wind-proof effect of the wind barrier near the pier is studied, and the variation of wind speed along the bridge is investigated. This paper probes into the influence range and law of piers in the direction and height of the bridge. 2. By using FLUENT software, the three-dimensional simulation model of truss main beam and bridge tower is established. The reasonable calculation parameters are determined by means of trial calculation and wind tunnel test data. The influence range of bridge tower on highway and railway deck wind speed, and the influence of wind barrier air permeability on the wind speed of bridge tower area are analyzed. By comparing with the results of wind tunnel test, the paper analyzes the influence of bridge deck wind speed on the wind speed of bridge deck under different working conditions. The study on the wind environment of the deck near the pier shows that the wind speed of the deck near the pier is reduced, and the wind speed decreases with the increase of height. The influence of piers on the wind-environment of the bridge deck is reduced, the variation of the incoming wind speed has a limited effect on the distribution of wind field above the deck, and the air permeability of the wind barrier and guardrail has a significant effect on the flow field of the windward driveway. The wind barrier weakens the sudden change of wind speed near the pier and reduces the wind speed in the range of driving height. The study on the wind environment of the bridge deck near the bridge tower shows that when there is no wind barrier, The wind speed on the bridge deck increases sharply on both sides of the bridge tower, and then tends to be gentle; the farther away from the tower, the higher the effective height of the wind barrier; under the condition of wind barrier, the highway, The influence range of the tower on the bridge deck on the wind field is located in the area of 25m or 15m on both sides of the bridge towards the bridge respectively. The smaller the air permeability of the wind barrier on the railway bridge is, the more severe the sudden change of wind speed is.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441

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