钢连接件对脲醛树脂泡沫外墙外保温系统的影响研究
发布时间：2019-04-12 08:45
【摘要】：随着我国对建筑节能要求的提高,保温性能较高的有机保温材料得到了广泛应用。但是有机材料易燃的致命缺点,导致其成为近年来多起重大火灾的主因。因此国家出台了相关法律法规,明确规定有机保温材料的应用范围,致使有机材料的应用受到限制。脲醛树脂泡沫是由国外引进的一种新型的有机保温材料,不仅保温性能优越、价格低廉,而且抗火等级达到B1难燃级别,具有广泛的应用范围和市场前景。目前,国内对其应用和研究尚处于初步探索阶段,仅应用于夹芯墙保温和屋顶保温,在我国应用广泛的外墙外保温工程中尚未得到应用。本文针对脲醛树脂泡沫材料的特性,设计一种能够与其适应的外墙外保温系统,简称CUFFI保温系统。结合试验、理论和有限元模拟三种方法,分析研究其热工性能;并利用有限元模拟方法,分析其受力性能。首先,结合控温箱-热流计和热像仪检测两种方法,分析了CUFFI保温系统中的C型钢连接件对其热工性能的影响,并将试验结果与理论计算和ABAQUS有限元模拟结果进行对比分析,得到结论:连接件导热系数较大,其应用降低了保温层的热阻,会对系统保温性能造成不利影响,但影响程度在可接受范围内;CUFFI保温系统保温层中的两种材料导热系数相差悬殊,不适于采用《民用建筑热工设计规范》里的理论计算方法;有限元模拟分析结果与试验结果相近,确定利用有限元模拟进行热工性能分析的可行性。其次,为减小C型钢连接件对保温性能的不利影响,利用ABAQUS有限元软件,分析了连接件板材厚度、腹板开孔的横纵向间距和边距及孔宽度对其当量导热系数的影响。得到结论:板材厚度对当量导热系数无影响,腹板开孔越细密越有利于降低当量导热系数;确定了不同长度连接件的具体开孔尺寸,及其对应的当量导热系数。然后,按照前面设计的连接件开孔尺寸,建立CUFFI保温系统有限元模拟分析模型。以哈尔滨地区气候条件为例,进行了整体热工性能评价分析。得到结论:CUFFI保温系统中的保温层对应的温度梯度最大,表明脲醛树脂泡沫材料保温效果良好;确定了CUFFI保温系统应用于哈尔滨地区时,对应不同高度范围和基墙类型的住宅建筑,所需的满足传热系数限值条件的保温层厚度;保温层厚度满足传热系数限值时,保温系统内墙表面最低温度均高于露点温度,不会因连接件的热桥效应而产生结露发霉现象。最后,基于通用有限元软件ABAQUS,对自重和风荷载作用下的CUFFI保温系统进行受力性能模拟分析。根据各构件材料特性,以装饰板的最大侧向位移和主应力及连接件的Mises应力为控制参数,以连接件板材厚度和布置方式及装饰板厚度为变量,以哈尔滨地区为例,进行了合理构造尺寸研究。得到结论:装饰板的最大侧向位移和主应力主要求受其自身厚度影响,连接件板材厚度的影响不大;装饰板和连接件板材厚度对连接件的Mises应力的影响相当,但是二者均较厚时却不利于减小连接件的Mises应力;加密连接件布置是减小应力和位移最为行之有效的方法;根据控制参数限值,确定了哈尔滨地区不同高度住宅建筑所需的CUFFI保温系统的合理尺寸构造。
[Abstract]:With the improvement of the energy-saving requirements of our country, the organic heat-insulating material with high heat-insulating property has been widely used. But the fatal drawback of organic materials is the main cause of a number of major fires in recent years. Therefore, the state has issued relevant laws and regulations, which clearly specifies the application range of the organic heat-insulating material, and the application of the organic material is limited. The foam is a new kind of organic heat-insulating material introduced from abroad, not only has the advantages of excellent heat-insulating property, low price, but also the fire-resistant grade reaches the B1 fire-retardant grade, and has wide application range and market prospect. At present, the domestic application and research are still in the preliminary exploration stage, only applied to the heat preservation of the sandwich wall and the thermal insulation of the roof, and has not been applied in the application of the external thermal insulation engineering of the external wall in China. In this paper, a kind of external thermal insulation system, called CUFFI thermal insulation system, which can be adapted to it is designed. In this paper, three methods of test, theory and finite element simulation are used to analyze the thermal performance of the system. The finite element simulation method is used to analyze its stress performance. First of all, the influence of C-shaped steel connecting piece on the thermal performance of the CUFFI thermal insulation system is analyzed in combination with the temperature control box-heat flow meter and the thermal imager, and the results of the test are compared with the theoretical calculation and the ABAQUS finite element simulation results to obtain the conclusion: The heat-conducting coefficient of the connecting piece is large, the application of the heat-insulating layer reduces the thermal resistance of the heat-insulating layer, can adversely affect the heat-insulation performance of the system, It is not suitable to adopt the theoretical calculation method of the Thermal Engineering Design Specification for Civil Buildings. The results of the finite element simulation analysis are close to the test results, and the feasibility of using the finite element simulation to perform the thermal performance analysis is determined. Secondly, in order to reduce the adverse effect of C-shaped steel connecting piece on the heat-insulating property, the influence of the thickness of the connecting piece, the transverse longitudinal distance and the distance of the web and the width of the hole on the equivalent thermal conductivity of the connecting piece was analyzed by using the ABAQUS finite element software. It is concluded that the thickness of the plate has no effect on the equivalent thermal conductivity, and the more fine the opening of the web is, the better the equivalent thermal conductivity can be reduced; the specific opening size of the connector with different lengths and the equivalent thermal conductivity are determined. Then, the finite element simulation analysis model of the CUFFI thermal insulation system is established according to the opening size of the connecting piece designed in the front. Taking the climate condition of Harbin as an example, the overall thermal performance evaluation and analysis are carried out. The results are as follows: the temperature gradient of the thermal insulation layer in the CUFFI thermal insulation system is the largest, indicating that the thermal insulation effect of the CUFFI thermal insulation system is good; when the CUFFI thermal insulation system is used in the Harbin area, the residential building corresponding to the different height range and the base wall type is determined, And the minimum temperature of the inner wall surface of the heat preservation system is higher than the dew point temperature when the thickness of the insulation layer meets the heat transfer coefficient limit value, and the condensation and moldy phenomenon is not generated due to the thermal bridge effect of the connecting piece. Finally, based on the general finite element software ABAQUS, the force performance simulation of the CUFFI thermal insulation system under the action of dead weight and wind load is carried out. Based on the material property of each component, the maximum lateral displacement of the decorative board and the Mises stress of the connecting piece are the control parameters, and the thickness and the arrangement method of the connecting piece and the thickness of the decorative board are used as variables, and the reasonable structure and size study is carried out taking the Harbin area as an example. It is concluded that the maximum lateral displacement and principal stress of the decorative board are mainly affected by their own thickness, the influence of the thickness of the connecting piece is not large, the thickness of the decorative plate and the connecting piece is equivalent to the Mises stress of the connecting piece, But it is not conducive to the reduction of the Mises stress of the connecting piece when the two are thicker; the arrangement of the encrypted connecting piece is the most effective way to reduce the stress and displacement; according to the limit of the control parameter, the reasonable size construction of the CUFFI thermal insulation system required for different height residential buildings in the Harbin area is determined.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU111.41;TU551
本文编号：2456880
[Abstract]:With the improvement of the energy-saving requirements of our country, the organic heat-insulating material with high heat-insulating property has been widely used. But the fatal drawback of organic materials is the main cause of a number of major fires in recent years. Therefore, the state has issued relevant laws and regulations, which clearly specifies the application range of the organic heat-insulating material, and the application of the organic material is limited. The foam is a new kind of organic heat-insulating material introduced from abroad, not only has the advantages of excellent heat-insulating property, low price, but also the fire-resistant grade reaches the B1 fire-retardant grade, and has wide application range and market prospect. At present, the domestic application and research are still in the preliminary exploration stage, only applied to the heat preservation of the sandwich wall and the thermal insulation of the roof, and has not been applied in the application of the external thermal insulation engineering of the external wall in China. In this paper, a kind of external thermal insulation system, called CUFFI thermal insulation system, which can be adapted to it is designed. In this paper, three methods of test, theory and finite element simulation are used to analyze the thermal performance of the system. The finite element simulation method is used to analyze its stress performance. First of all, the influence of C-shaped steel connecting piece on the thermal performance of the CUFFI thermal insulation system is analyzed in combination with the temperature control box-heat flow meter and the thermal imager, and the results of the test are compared with the theoretical calculation and the ABAQUS finite element simulation results to obtain the conclusion: The heat-conducting coefficient of the connecting piece is large, the application of the heat-insulating layer reduces the thermal resistance of the heat-insulating layer, can adversely affect the heat-insulation performance of the system, It is not suitable to adopt the theoretical calculation method of the Thermal Engineering Design Specification for Civil Buildings. The results of the finite element simulation analysis are close to the test results, and the feasibility of using the finite element simulation to perform the thermal performance analysis is determined. Secondly, in order to reduce the adverse effect of C-shaped steel connecting piece on the heat-insulating property, the influence of the thickness of the connecting piece, the transverse longitudinal distance and the distance of the web and the width of the hole on the equivalent thermal conductivity of the connecting piece was analyzed by using the ABAQUS finite element software. It is concluded that the thickness of the plate has no effect on the equivalent thermal conductivity, and the more fine the opening of the web is, the better the equivalent thermal conductivity can be reduced; the specific opening size of the connector with different lengths and the equivalent thermal conductivity are determined. Then, the finite element simulation analysis model of the CUFFI thermal insulation system is established according to the opening size of the connecting piece designed in the front. Taking the climate condition of Harbin as an example, the overall thermal performance evaluation and analysis are carried out. The results are as follows: the temperature gradient of the thermal insulation layer in the CUFFI thermal insulation system is the largest, indicating that the thermal insulation effect of the CUFFI thermal insulation system is good; when the CUFFI thermal insulation system is used in the Harbin area, the residential building corresponding to the different height range and the base wall type is determined, And the minimum temperature of the inner wall surface of the heat preservation system is higher than the dew point temperature when the thickness of the insulation layer meets the heat transfer coefficient limit value, and the condensation and moldy phenomenon is not generated due to the thermal bridge effect of the connecting piece. Finally, based on the general finite element software ABAQUS, the force performance simulation of the CUFFI thermal insulation system under the action of dead weight and wind load is carried out. Based on the material property of each component, the maximum lateral displacement of the decorative board and the Mises stress of the connecting piece are the control parameters, and the thickness and the arrangement method of the connecting piece and the thickness of the decorative board are used as variables, and the reasonable structure and size study is carried out taking the Harbin area as an example. It is concluded that the maximum lateral displacement and principal stress of the decorative board are mainly affected by their own thickness, the influence of the thickness of the connecting piece is not large, the thickness of the decorative plate and the connecting piece is equivalent to the Mises stress of the connecting piece, But it is not conducive to the reduction of the Mises stress of the connecting piece when the two are thicker; the arrangement of the encrypted connecting piece is the most effective way to reduce the stress and displacement; according to the limit of the control parameter, the reasonable size construction of the CUFFI thermal insulation system required for different height residential buildings in the Harbin area is determined.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU111.41;TU551
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