鋼連接件對脲醛樹脂泡沫外墻外保溫系統(tǒng)的影響研究
發(fā)布時(shí)間：2019-04-12 08:45
【摘要】：隨著我國對建筑節(jié)能要求的提高,保溫性能較高的有機(jī)保溫材料得到了廣泛應(yīng)用。但是有機(jī)材料易燃的致命缺點(diǎn),導(dǎo)致其成為近年來多起重大火災(zāi)的主因。因此國家出臺(tái)了相關(guān)法律法規(guī),明確規(guī)定有機(jī)保溫材料的應(yīng)用范圍,致使有機(jī)材料的應(yīng)用受到限制。脲醛樹脂泡沫是由國外引進(jìn)的一種新型的有機(jī)保溫材料,不僅保溫性能優(yōu)越、價(jià)格低廉,而且抗火等級達(dá)到B1難燃級別,具有廣泛的應(yīng)用范圍和市場前景。目前,國內(nèi)對其應(yīng)用和研究尚處于初步探索階段,僅應(yīng)用于夾芯墻保溫和屋頂保溫,在我國應(yīng)用廣泛的外墻外保溫工程中尚未得到應(yīng)用。本文針對脲醛樹脂泡沫材料的特性,設(shè)計(jì)一種能夠與其適應(yīng)的外墻外保溫系統(tǒng),簡稱CUFFI保溫系統(tǒng)。結(jié)合試驗(yàn)、理論和有限元模擬三種方法,分析研究其熱工性能;并利用有限元模擬方法,分析其受力性能。首先,結(jié)合控溫箱-熱流計(jì)和熱像儀檢測兩種方法,分析了CUFFI保溫系統(tǒng)中的C型鋼連接件對其熱工性能的影響,并將試驗(yàn)結(jié)果與理論計(jì)算和ABAQUS有限元模擬結(jié)果進(jìn)行對比分析,得到結(jié)論:連接件導(dǎo)熱系數(shù)較大,其應(yīng)用降低了保溫層的熱阻,會(huì)對系統(tǒng)保溫性能造成不利影響,但影響程度在可接受范圍內(nèi);CUFFI保溫系統(tǒng)保溫層中的兩種材料導(dǎo)熱系數(shù)相差懸殊,不適于采用《民用建筑熱工設(shè)計(jì)規(guī)范》里的理論計(jì)算方法;有限元模擬分析結(jié)果與試驗(yàn)結(jié)果相近,確定利用有限元模擬進(jìn)行熱工性能分析的可行性。其次,為減小C型鋼連接件對保溫性能的不利影響,利用ABAQUS有限元軟件,分析了連接件板材厚度、腹板開孔的橫縱向間距和邊距及孔寬度對其當(dāng)量導(dǎo)熱系數(shù)的影響。得到結(jié)論:板材厚度對當(dāng)量導(dǎo)熱系數(shù)無影響,腹板開孔越細(xì)密越有利于降低當(dāng)量導(dǎo)熱系數(shù);確定了不同長度連接件的具體開孔尺寸,及其對應(yīng)的當(dāng)量導(dǎo)熱系數(shù)。然后,按照前面設(shè)計(jì)的連接件開孔尺寸,建立CUFFI保溫系統(tǒng)有限元模擬分析模型。以哈爾濱地區(qū)氣候條件為例,進(jìn)行了整體熱工性能評價(jià)分析。得到結(jié)論:CUFFI保溫系統(tǒng)中的保溫層對應(yīng)的溫度梯度最大,表明脲醛樹脂泡沫材料保溫效果良好;確定了CUFFI保溫系統(tǒng)應(yīng)用于哈爾濱地區(qū)時(shí),對應(yīng)不同高度范圍和基墻類型的住宅建筑,所需的滿足傳熱系數(shù)限值條件的保溫層厚度;保溫層厚度滿足傳熱系數(shù)限值時(shí),保溫系統(tǒng)內(nèi)墻表面最低溫度均高于露點(diǎn)溫度,不會(huì)因連接件的熱橋效應(yīng)而產(chǎn)生結(jié)露發(fā)霉現(xiàn)象。最后,基于通用有限元軟件ABAQUS,對自重和風(fēng)荷載作用下的CUFFI保溫系統(tǒng)進(jìn)行受力性能模擬分析。根據(jù)各構(gòu)件材料特性,以裝飾板的最大側(cè)向位移和主應(yīng)力及連接件的Mises應(yīng)力為控制參數(shù),以連接件板材厚度和布置方式及裝飾板厚度為變量,以哈爾濱地區(qū)為例,進(jìn)行了合理構(gòu)造尺寸研究。得到結(jié)論:裝飾板的最大側(cè)向位移和主應(yīng)力主要求受其自身厚度影響,連接件板材厚度的影響不大;裝飾板和連接件板材厚度對連接件的Mises應(yīng)力的影響相當(dāng),但是二者均較厚時(shí)卻不利于減小連接件的Mises應(yīng)力;加密連接件布置是減小應(yīng)力和位移最為行之有效的方法;根據(jù)控制參數(shù)限值,確定了哈爾濱地區(qū)不同高度住宅建筑所需的CUFFI保溫系統(tǒng)的合理尺寸構(gòu)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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU111.41;TU551
本文編號：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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU111.41;TU551
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