Glubam胶合竹材动态燃烧及炭化性能研究
发布时间：2018-10-09 15:31
【摘要】：随着环境负面问题的日益突出,节能减排及可持续发展已成为世界各国政府工作的重心之一。竹材作为一种绿色环保可再生材料,在我国产量极为丰富,用其加工制作的胶合板材也具有优良的加工性能和力学特性,同时用胶合竹材建造的竹结构房屋具有施工速度快、抗震性能优越、造价低廉等优点,目前已在工程实践中得到应用。但是,胶合竹材作为现代竹结构的基本材料,其具有可燃性,其耐火性能严重阻碍了现代竹结构的发展,因此为了推进胶合竹材的工程应用及现代竹结构的发展,本文对胶合竹材的动态燃烧性能、炭化及传热性能进行试验研究,同时运用有限元分析软件ABAQUS对其温度场进行数值模拟分析。主要研究内容及结果包括以下几个方面:(1)运用锥形量热仪对不同热辐射强度下胶合竹材的动态燃烧性能进行试验研究,对其点燃时间、热释放速率、质量损失速率、产烟速率、CO2及CO产率等燃烧参数进行分析,并与木胶合板进行比较。同时运用以上参数,从着火性、火灾热危险及烟气危险三个方面对胶合竹材的火灾危险性进行评估,并对其火灾轰燃时间及耐火时间进行预测。结果表明:在火灾的早期发展阶段,胶合竹材具有较高的火灾热危险,随着火势的发展,胶合竹材的火灾热危险性有所降低,其火势发展速度低于木胶合板,但胶合竹材火灾烟气危险远高于木胶合板;(2)按照恒温及ISO标准升温两种不同的升温方式,对单面受火胶合竹材的炭化速率及温度场进行试验研究,得出胶合竹材受火炭化的一般规律,并测得其在标准火灾条件下的炭化速率为0.64mm/min;同时通过对温度场数据分析,可知胶合竹材具有优于杉木的隔热性能;(3)基于竹材和木材化学组成及微观结构的相似性,参照木材的相关热力学参数,对胶合竹材的温度场进行有限元模拟分析,并和单面受火胶合竹材的温度场试验结果进行对比,分析木材热力学参数对胶合竹材的适用性。结果表明:在炭化层形成之前,有限元结果与试验结果吻合较好,但在炭化层形成之后两者出现差别,胶合竹材的热工性能仍需进一步系统研究。
[Abstract]:With the increasingly prominent negative environmental problems, energy saving and emission reduction and sustainable development have become one of the priorities of governments all over the world. As a kind of green and environmental protection renewable material, bamboo is very rich in output in our country. The glued board made by bamboo has excellent processing performance and mechanical properties, and the bamboo structure building built with glued bamboo has a fast construction speed. The advantages of excellent seismic performance and low cost have been applied in engineering practice. However, as the basic material of modern bamboo structure, glued bamboo has flammability, its fire resistance seriously hinders the development of modern bamboo structure, so in order to promote the engineering application of glued bamboo and the development of modern bamboo structure, In this paper, the dynamic combustion performance, carbonization and heat transfer performance of glued bamboo are studied. The temperature field of glued bamboo is simulated by finite element analysis software ABAQUS. The main research contents and results are as follows: (1) the dynamic combustion performance of glued bamboo under different thermal radiation intensity was studied by using a cone calorimeter, and the ignition time, heat release rate, mass loss rate were studied. The combustion parameters such as CO _ 2 and CO yield were analyzed and compared with wood plywood. At the same time, the fire hazard of glued bamboo wood was evaluated from three aspects of fire ignition, fire thermal hazard and smoke hazard, and the fire flashover time and fire resistance time were predicted. The results showed that, in the early stage of fire, glued bamboo had a higher fire thermal hazard. With the development of fire, the fire thermal hazard of glued bamboo was decreased, and the fire rate of glued bamboo was lower than that of wood plywood. But the fire smoke danger of glued bamboo wood is much higher than that of wood plywood. (2) according to two different heating methods of constant temperature and ISO standard, the carbonization rate and temperature field of single side fire bonded bamboo are studied. The general rule of carbonization of glued bamboo is obtained, and the carbonization rate of glued bamboo under standard fire conditions is 0.64 mm / min. At the same time, the temperature field data are analyzed. It can be seen that glued bamboo has better thermal insulation performance than Chinese fir. (3) based on the similarity of chemical composition and microstructure of bamboo and wood, the temperature field of glued bamboo is simulated by finite element method according to the relevant thermodynamic parameters of wood. The applicability of wood thermodynamic parameters to glued bamboo wood was analyzed by comparing with the results of temperature field test of single side bonded bamboo wood. The results show that the finite element results are in good agreement with the experimental results before the carbonization layer is formed, but after the formation of the carbonized layer, there are differences between the two, and the thermal properties of bonded bamboo wood need further systematic study.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU531
本文编号：2259841
[Abstract]:With the increasingly prominent negative environmental problems, energy saving and emission reduction and sustainable development have become one of the priorities of governments all over the world. As a kind of green and environmental protection renewable material, bamboo is very rich in output in our country. The glued board made by bamboo has excellent processing performance and mechanical properties, and the bamboo structure building built with glued bamboo has a fast construction speed. The advantages of excellent seismic performance and low cost have been applied in engineering practice. However, as the basic material of modern bamboo structure, glued bamboo has flammability, its fire resistance seriously hinders the development of modern bamboo structure, so in order to promote the engineering application of glued bamboo and the development of modern bamboo structure, In this paper, the dynamic combustion performance, carbonization and heat transfer performance of glued bamboo are studied. The temperature field of glued bamboo is simulated by finite element analysis software ABAQUS. The main research contents and results are as follows: (1) the dynamic combustion performance of glued bamboo under different thermal radiation intensity was studied by using a cone calorimeter, and the ignition time, heat release rate, mass loss rate were studied. The combustion parameters such as CO _ 2 and CO yield were analyzed and compared with wood plywood. At the same time, the fire hazard of glued bamboo wood was evaluated from three aspects of fire ignition, fire thermal hazard and smoke hazard, and the fire flashover time and fire resistance time were predicted. The results showed that, in the early stage of fire, glued bamboo had a higher fire thermal hazard. With the development of fire, the fire thermal hazard of glued bamboo was decreased, and the fire rate of glued bamboo was lower than that of wood plywood. But the fire smoke danger of glued bamboo wood is much higher than that of wood plywood. (2) according to two different heating methods of constant temperature and ISO standard, the carbonization rate and temperature field of single side fire bonded bamboo are studied. The general rule of carbonization of glued bamboo is obtained, and the carbonization rate of glued bamboo under standard fire conditions is 0.64 mm / min. At the same time, the temperature field data are analyzed. It can be seen that glued bamboo has better thermal insulation performance than Chinese fir. (3) based on the similarity of chemical composition and microstructure of bamboo and wood, the temperature field of glued bamboo is simulated by finite element method according to the relevant thermodynamic parameters of wood. The applicability of wood thermodynamic parameters to glued bamboo wood was analyzed by comparing with the results of temperature field test of single side bonded bamboo wood. The results show that the finite element results are in good agreement with the experimental results before the carbonization layer is formed, but after the formation of the carbonized layer, there are differences between the two, and the thermal properties of bonded bamboo wood need further systematic study.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU531
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