轻质自保温复合墙板试验研究

发布时间：2018-05-14 09:01

本文选题：自保温墙板 + 传热系数　；参考：《河南大学》2014年硕士论文

【摘要】：能源是维持人类文明的主要因素，节能环保成为了一个世界性的研究课题。据研究表明，每年建筑能耗占全社会能耗的28%左右，而外墙耗能占建筑总能耗的20%到30%。因此，研制新型保温围护体系是解决建筑能耗问题的主要途径之一。本研究根据现代已有研究成果，自住创新提出了以聚苯板作为保温夹心层的陶粒混凝土轻质自保温复合墙板，两种板层通过高分子塑料纤维连接在一起，使各个板层成为能协同工作的整体，保证墙板既具有良好的热工性能又具有优良的力学性能。本研究的创新点在于选取自保温体系作为研究对象，选取保温性能优秀的聚苯板和兼保温与承重性能为一体的陶粒混凝土作为墙板的主体材料，通过采取有效构造措施减少由热桥效应引起的能源消耗，理论分析与模拟试验数据分析相结合，同时利用ANSYS有限元分析软件进行建模分析，得出了各个分析结果的一致性，全面论证此新型保温墙板的研究价值和应用意义。本文研究的重点是轻质自保温复合墙板的保温性能和力学性能。陶粒混凝土是本研究墙板的主要承重材料，本文首先讨论了其质轻、高强，保温的性质。采用两种方法求出了，一定强度等级下的陶粒混凝土的弹性模量，以及深入分析了掺入的粉煤灰对其抗渗性能的影响。在研究本轻质自保温复合墙板的热工性能，首先通过理论计算两种类型墙板的传热系数。本研究自保温墙板与泡沫混凝土自保温墙板相比，传热系数小了很多，理论证明了本研究自保温墙板保温性能和耐久性的优越性。然后通过热工性能检测试验，研究分析了在墙板两侧不同的稳态温度下各板层的温度分布与保温夹心层厚度的关系；通过试验数据建立了温度场模拟图形，引入了一个温度场正切因子的概念，确定了一定墙板厚度下，所使用保温夹心层的尺寸。对本自保温复合墙板的传热系数理论计算值与试验值进行对比分析，找到了小偏差的原因。最后通过有限元模拟软件进行分析，输出的温度场图表与通过试验数据建立的温度场图形，误差允许范围内完全吻合。在研究本轻质自保温复合墙板的力学性能，主要从轴心受压和恒定轴压比下的水平受力两个方面进行研究，两种试验都采用时间控制加载的方式。描述了墙板的破坏形态，，分析了在加载过程中，墙板的位移曲线和荷载曲线，测得了本自保温墙板设定厚度尺寸下的极限承载力。综合以上分析得出，本研究轻质自保温复合墙板的保温性能复合国家相关规范对围护结构节能不小于65%节能标准以及力学性能的要求，证实了其在实际工程中应用的可行性。
[Abstract]:Energy is the main factor to maintain human civilization, energy conservation and environmental protection has become a worldwide research topic. According to the research, the energy consumption of the building accounts for about 28% of the total energy consumption of the whole society every year, while the energy consumption of the exterior wall accounts for 20% to 30% of the total energy consumption of the building. Therefore, the development of new insulation envelope system is one of the main ways to solve the problem of building energy consumption. In this study, according to the existing research results, a novel composite wall board of ceramic grain concrete with polystyrene as the insulation sandwich layer is proposed. The two kinds of panels are connected together by polymer plastic fiber. Each layer can work together as a whole to ensure that the wall board has good thermal performance and excellent mechanical performance. The innovation of this study is to select the self-insulation system as the research object, the polystyrene board with excellent thermal insulation performance and the ceramsite concrete as the main material of the wall board. By taking effective construction measures to reduce the energy consumption caused by the heat bridge effect, the theoretical analysis is combined with the simulation test data analysis. At the same time, the ANSYS finite element analysis software is used to model and analyze the energy consumption, and the consistency of the analysis results is obtained. The research value and application significance of this new type insulation wall board are demonstrated in an all-round way. This paper focuses on the thermal insulation and mechanical properties of lightweight self-insulating composite wall panels. Ceramsite concrete is the main load-bearing material in this study. The properties of lightweight, high-strength and heat preservation are discussed in this paper. The elastic modulus of ceramsite concrete with a certain strength grade and the influence of fly ash on its impermeability are calculated by two methods. In order to study the thermal performance of the lightweight self-insulating composite wall panel, the heat transfer coefficient of two types of wall panels is calculated theoretically. The heat transfer coefficient of the self-insulating wall board is much smaller than that of the foamed concrete wall board. The theory proves the superiority of the research on the thermal insulation performance and durability of the self-insulating wall board. Then, through the test of thermal performance, the relationship between the temperature distribution of each layer and the thickness of the insulation sandwich layer under the different steady temperature on both sides of the wall board is studied and analyzed, and the simulation pattern of the temperature field is established through the test data. A concept of tangent factor of temperature field is introduced, and the size of the insulation sandwich layer is determined under certain wall thickness. The theoretical calculation value of heat transfer coefficient and the experimental value of the self-insulating composite wall panel are compared and analyzed, and the reasons for the small deviation are found. Finally, through the finite element simulation software analysis, the output temperature field diagram and the temperature field graph established through the test data, the error is completely consistent within the allowable range. In this paper, the mechanical properties of the lightweight self-insulating composite wallboard are studied mainly from two aspects: axial compression and horizontal force under constant axial compression ratio. Both tests adopt time-controlled loading mode. The failure mode of the wall panel is described and the displacement curve and load curve of the wall board during the loading process are analyzed. The ultimate bearing capacity of the self-insulating wall panel is measured under the given thickness size. According to the above analysis, the thermal insulation performance of light-weight self-insulating composite wall panel is studied. The requirements of the national code for energy saving of envelope structure are not less than 65%, and the requirement of mechanical properties is proved, which proves the feasibility of its application in practical engineering.
【学位授予单位】：河南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU551

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