發(fā)布時間：2018-03-24 00:12

  本文選題：水熱式融雪　切入點：橋面鋪裝　出處：《長安大學》2015年碩士論文

【摘要】：長期以來,積雪結(jié)冰路(橋)面的行車安全問題受到廣泛關(guān)注。各國交通部門研究出多種方法以解決路(橋)面融雪問題,由于這些方法存在的一些缺陷(效率低、費用高、極易破壞道路設(shè)施、耗能大、循環(huán)性較差),各國對具有發(fā)展前途、環(huán)保節(jié)能和可循環(huán)利用等優(yōu)點的水熱式熱融雪化冰技術(shù)更為關(guān)注。目前國內(nèi)對該技術(shù)研究應(yīng)用尚處于起始階段。本文針對橋面埋管內(nèi)循環(huán)水的特點,對水熱式融雪系統(tǒng)的埋管橋面進行數(shù)值模擬,研究的內(nèi)容主要有以下幾個方面:一、介紹了水熱式融雪系統(tǒng)的組成,對橋面管網(wǎng)布設(shè)和埋管連接方式進行了分析,研究了該系統(tǒng)輸水主管道材質(zhì)、埋管材質(zhì)、埋管管徑和管內(nèi)流體須滿足的條件。利用傳熱學的基本理論,結(jié)合埋管橋面融雪系統(tǒng),系統(tǒng)地分析了融雪過程中的熱量傳遞,定解條件以及對流系數(shù)的計算。二、利用有限單元法建立三維熱力模型,對埋管橋面鋪裝層溫度場進行瞬態(tài)分析,主要研究管間距、埋深、管內(nèi)水溫以及流速對融雪過程中鋪裝層溫度分布、熱流密度以及融雪時間的影響,為公路埋管橋面融冰雪系統(tǒng)設(shè)計和施工提供參考。三、由于加載溫度荷載時埋管橋面不同于普通橋面,利用有限單元法建立橋面結(jié)構(gòu)模型,分析環(huán)境降溫和埋管加熱橋面時橋面鋪裝層和埋管的溫度效應(yīng),從而提出合理的埋管方案。四、埋管橋面在環(huán)境降溫、埋管加熱橋面以及車載的共同作用下,鋪裝層的受力情況不同于單個因素作用于橋面板,本文通過以上諸多因素的耦合對埋管橋面鋪裝層作用的分析,研究不同工況下鋪裝層和埋管的力學響應(yīng)。
[Abstract]:For a long time, the traffic safety problem of snow-icing roads (bridges) has received extensive attention. The transportation departments of various countries have developed a variety of methods to solve the snow melting problems of roads (bridges), because of the shortcomings of these methods (low efficiency and high cost), Extremely vulnerable to destruction of road facilities, high energy consumption, poor circulation, and good prospects for development in various countries, The advantages of environmental protection, energy saving and recycling, such as hydrothermal heat melting, snow melting and ice melting, are more concerned. The research and application of this technology in China is still in its initial stage. This paper aims at the characteristics of circulating water in buried pipe of bridge deck. Numerical simulation of buried pipe deck of water-heat snowmelt system is carried out. The main contents of the research are as follows: 1. The composition of water-heat snowmelt system is introduced, and the arrangement of bridge deck pipe network and the connection mode of buried pipe are analyzed. The material of the main pipe, the material of the buried pipe, the diameter of the buried pipe and the conditions of the fluid in the pipe are studied. The heat transfer in the snowmelt process is analyzed systematically by using the basic theory of heat transfer and combining with the snow melting system of the buried pipe bridge deck. Second, the finite element method is used to establish a three-dimensional thermodynamic model to analyze the temperature field of the buried pipe bridge deck and pavement layer, which mainly studies the pipe spacing, the depth of the buried pipe, the calculation of the convection coefficient, and the calculation of the convection coefficient. The influence of water temperature and velocity of flow in pipe on the temperature distribution, heat flux and melting time of pavement in the course of snow melting provides a reference for the design and construction of snow melting system for highway buried pipe bridge deck. Because the buried pipe deck is different from the ordinary bridge deck when the temperature load is loaded, the finite element method is used to establish the bridge deck structure model, and the temperature effect of the deck pavement and buried pipe is analyzed when the environment is cooled and the buried pipe is heated. Therefore, a reasonable buried pipe scheme is put forward. Fourthly, under the joint action of the buried pipe deck under the environment cooling, the buried pipe heating the bridge deck and the vehicle, the stress situation of the pavement is different from that of the single factor acting on the bridge slab. In this paper, the mechanical responses of the buried pipe and the buried pipe under different working conditions are studied through the analysis of the coupling of the above factors to the buried pipe bridge deck pavement.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U443.33

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本文編號：1655831