基于水热式融雪技术桥面铺装温度场及力学研究

发布时间：2018-03-24 00:12

本文选题：水热式融雪　切入点：桥面铺装　出处：《长安大学》2015年硕士论文

【摘要】：长期以来,积雪结冰路(桥)面的行车安全问题受到广泛关注。各国交通部门研究出多种方法以解决路(桥)面融雪问题,由于这些方法存在的一些缺陷(效率低、费用高、极易破坏道路设施、耗能大、循环性较差),各国对具有发展前途、环保节能和可循环利用等优点的水热式热融雪化冰技术更为关注。目前国内对该技术研究应用尚处于起始阶段。本文针对桥面埋管内循环水的特点,对水热式融雪系统的埋管桥面进行数值模拟,研究的内容主要有以下几个方面:一、介绍了水热式融雪系统的组成,对桥面管网布设和埋管连接方式进行了分析,研究了该系统输水主管道材质、埋管材质、埋管管径和管内流体须满足的条件。利用传热学的基本理论,结合埋管桥面融雪系统,系统地分析了融雪过程中的热量传递,定解条件以及对流系数的计算。二、利用有限单元法建立三维热力模型,对埋管桥面铺装层温度场进行瞬态分析,主要研究管间距、埋深、管内水温以及流速对融雪过程中铺装层温度分布、热流密度以及融雪时间的影响,为公路埋管桥面融冰雪系统设计和施工提供参考。三、由于加载温度荷载时埋管桥面不同于普通桥面,利用有限单元法建立桥面结构模型,分析环境降温和埋管加热桥面时桥面铺装层和埋管的温度效应,从而提出合理的埋管方案。四、埋管桥面在环境降温、埋管加热桥面以及车载的共同作用下,铺装层的受力情况不同于单个因素作用于桥面板,本文通过以上诸多因素的耦合对埋管桥面铺装层作用的分析,研究不同工况下铺装层和埋管的力学响应。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.33

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