共查询到20条相似文献,搜索用时 546 毫秒
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针对砖混结构房屋中常见的温度裂缝问题,对砖混结构房屋温度裂缝的机理进行了分析,介绍了其温度裂缝的种类,从设计和施工方面,提出了预防砖混结构房屋温度裂缝的措施。 相似文献
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介绍了砖混结构住宅温度裂缝的原因,阐述了温度裂缝的种类和成因,提出了预防温度裂缝的措施,指出在设计和施工中,应采取有效方法,以防止温度裂缝的产生。 相似文献
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对砖混结构建筑的墙体温度裂缝问题进行了探讨,阐述了温度裂缝的形式及特点,分析了墙体温度裂缝产生的原因,提出了设计和施工中应采取的防止温度裂缝的措施。 相似文献
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本文简单分析了混凝土结构温度裂缝发生和开展的机理,从理论上探讨了温度裂缝控制措施,并以多层砖混和框架结构房屋为例,从实践上概述了温度裂缝的控制与防范方法。 相似文献
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针对砖混结构温度变形裂缝这一质量通病,根据裂缝类型,分析了斜裂缝、水平裂缝和垂直裂缝产生的原因,并提出了温度裂缝的防治措施,以提高建筑物的美观效果,延长其使用寿命。 相似文献
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沥青混凝土路面非荷载性裂缝形成机理研究 总被引:2,自引:0,他引:2
杨成忠 《四川建筑科学研究》2006,32(3):82-84
裂缝是沥青混凝土路面的主要缺陷之一。早期裂缝对路面使用性能不会产生明显影响。然而,裂缝的扩展最终会导致沥青路面结构性破坏。引起沥青混凝土路面裂缝的原因错综复杂,不过可以将这些复杂原因引起的裂缝归结为荷载性裂缝和非荷载性裂缝两大类。温度裂缝和反射裂缝是非荷载裂缝的两种主要形式。从非荷载性裂缝的角度出发,详细分析了温度收缩裂缝、温度梯度裂缝和反射裂缝形成的机理,指出温度梯度是引起路面横向裂缝的主要原因,而反射裂缝是半刚性基层裂缝和温度裂缝综合作用的结果。 相似文献
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温度裂缝是建筑房屋中常见的裂缝形式,对常见温度裂缝特征、混合结构房屋的温度裂缝类型进行了介绍;并针对常见温度裂缝产生的原因,提出了防治措施。 相似文献
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目前我国建筑用能占社会总用能的比例不断提高,为了实现建筑用能的安全管理和节能管理,建筑能效管理系统应运而生,建筑用能管理的预警方法也得到了较大程度的重视。本文采用回归分析的方法,对办公建筑用电和温度进行回归分析并拟合,通过温度的变化提前预知建筑日最大负荷,并根据建筑日最大负荷的限定值得知温度的限定值,当温度超出限定值时产生高低温报警。通过利用某一办公建筑的实际运行数据进行仿真,验证了该预警方法的有效性,从而对电力规划起到一定的指导作用。 相似文献
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This paper presents model predictive controller (MPC) applied to the temperature control of real building. Conventional control strategies of a building heating system such as weather-compensated control cannot make use of the energy supplied to a building (e.g. solar gain in case of sunny day). Moreover dropout of outside temperature can lead to underheating of a building. Presented predictive controller uses both weather forecast and thermal model of a building to inside temperature control. By this, it can utilize thermal capacity of a building and minimize energy consumption. It can also maintain inside temperature at desired level independent of outside weather conditions. Nevertheless, proper identification of the building model is crucial. The models of multiple input multiple output systems (MIMO) can be identified by means of subspace methods. Oftentimes, the measured data used for identification are not satisfactory and need special treatment. During the 2009/2010 heating season, the controller was tested on a large university building and achieved savings of 17–24% compared to the present controller. 相似文献
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The coupling of thermal mass and natural ventilation is important to passive building design. Thermal mass can be classified as external thermal mass and internal thermal mass. Due to great diurnal variation of ambient air temperature and solar radiation intensity, heat transfer through building envelopes, which is called external thermal mass, is a complex and unsteady process. Indoor furniture are internal thermal mass, affecting the indoor air temperature through the process of absorbing and releasing heat. In this paper, a heat balance model coupling the external and internal thermal mass, natural ventilation rate and indoor air temperature for naturally ventilated building is developed. In this model, the inner surface temperature of building envelopes is obtained based on the harmonic response method. The effect of external and internal thermal mass on indoor air temperature for six external walls is discussed of different configurations including lightweight and heavy structures with and without external/internal insulation. Based on this model, a simple tool is developed to estimate the indoor air temperature for certain external and internal thermal mass and to determine the internal thermal mass needed to maintain required indoor air temperature for certain external wall for naturally ventilated building. 相似文献
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建筑环保节能涂料及玻璃透明隔热涂料的研制 总被引:1,自引:0,他引:1
建筑隔热涂料施涂于建筑物表面可有效地降低建筑物表面及内部的温度,并能缓解建筑物表面温度变化,对建筑物有良好的保护作用,其对于改善生活环境和节约能源等有重要意义。研究和开发建筑隔热涂料具有重大的经济效益、环境效益和社会效益。针对现今建筑隔热涂料应用中出现的问题,以及建筑节能的严格要求,本课题研究了用于玻璃的透明隔热涂料,以实现建筑节能向墙体、窗户一体化方向发展。 相似文献
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摘 要:以现行燃烧性能分级框架内的小尺度动态管式炉法和中尺度单体燃烧试验为产烟模型,选取典型阻燃和非阻燃材料开展燃烧产烟试验,利用FTIR等气体分析技术实时测量烟气组分数据,借助有效剂量分数(FED)等计算模型进行烟气毒性量化研究。结果表明:根据动态管式炉产烟气体分析计算的FED1值约为单体燃烧试验FED3max值的4~17倍;难燃材料单体燃烧试验获得的FED值较小,通常在0.15以下,而易燃材料的FED值则高达0.65;以小尺度动态管式炉和中尺度单体燃烧试验为产烟模型,应用毒性组分计算模型FED1和FED3,可对材料在火灾无焰燃烧(氧化热解)阶段和通风充足的有焰燃烧阶段的烟气毒性做出具有代表性的有效便捷评价。 相似文献
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This paper is concerned with the development of a mathematical model, capable of describing the quasi-steady state performance of an integrated ground source heat pump, which is used for heating and cooling of an institutional building located in a Mediterranean climate. The model is structured on functional basis according to the heat pump vapour compression or primary circuit, a secondary ground loop circuit and a secondary building loop circuit. Heat pump heating and cooling capacities, as well as COP, are considered to be dependent variables and are estimated in the model using performance fitted maps. Independent variables include: compressor speed, circulation pump speeds, ground loop return temperature and building circuit return temperature. The model is validated using data from a full-scale ground source heat pump installation. The validated model is used to examine system capacity and performance sensitivity to different control optimisation strategies, including set-point control of room air temperature, room air bandwidth temperature, building loop return water temperature and building loop return bandwidth temperature. 相似文献