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混凝土边框率对结构保温一体化墙板热工性能影响的试验研究
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Experimental Study on Effect of Concrete Frame Ratio on Thermal Performance of Structural Insulation Integrated Wall Panels
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    摘要:

    为了响应国家“十四五”规划大力发展装配式建筑,提升新建建筑节能水平的号召,助力国家“双碳”目标的实现,研发了一种预制结构保温一体化复合夹心墙板.墙板四周设置实心混凝土边框作为连接件,以实现墙板的全干式连接.边框的存在形成显著的热桥,这在很大程度上决定了墙板的热工性能.确定边框率对墙板热工性能的定量影响,对于墙板的构造设计优化和实际工程应用具有重要指导性作用.因此,本文设计了6组具有不同边框率的墙板试件,采用标定热箱法对试件进行测试,定量地分析边框率对预制墙板热工性能的影响规律.试验结果表明:混凝土边框的存在,不仅延长了墙板热传递达到稳态的时间,还极大降低了墙板的热工性能.边框率为19.94%、30.85%、40.95%、50.26%和61.43%时,墙板热阻值分别降低了79.26%、84.28%、87.48%、89.36%和91.10%.为满足现行建筑节能要求,在实际工程应用中要将墙板边框率控制在20%以内.通过对现有墙板热阻值计算方法和试验结果的对比分析,推荐采用区域法作为带边框墙板热阻值计算方法.

    Abstract:

    In response to the national “14th Five-Year Plan” to vigorously promote prefabricated construction and enhance the energy efficiency of new buildings and to contribute to the achievement of the nation's “dual carbon” target, a prefabricated structural insulation integrated composite sandwich wall panel is proposed. To achieve a fully dry connection for these wall panels, solid concrete frames are positioned around the perimeter of the panels as one of the connectors. The presence of concrete frames creates a significant thermal bridge, which largely determines the thermal performance of the wall panel. Quantifying the effect of the frame ratio on the thermal performance of the wall panel is of great guiding significance for its structural design optimization and practical engineering application. Therefore, six sets of wall panel specimens with varying frame ratios were designed and tested by calibrated hot box method in this study to quantitatively analyze the effect of the frame ratio on the thermal performance of prefabricated wall panels. The experimental results reveal that the presence of concrete frames not only postpones the time to reach a steady state in thermal transmission but significantly reduces the thermal performance of the wall panel. When the frame ratio is 19.94%, 30.85%, 40.95%, 50.26%, and 61.43%, the thermal resistance of the wall panel is reduced by 79.26%, 84.28%, 87.48%, 89.36%, and 91.10%, respectively. To meet the current building energy-saving requirements, the frame ratio of the wall panel should be controlled within 20% in practical engineering applications. Through a comparative analysis of various methods for calculating wall panel thermal resistance with experimental results, it is recommended to use the zone method as the thermal resistance calculation method for wall panels with concrete frames.

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熊峰 ,娄广亚 ,冉明明 ?.混凝土边框率对结构保温一体化墙板热工性能影响的试验研究[J].湖南大学学报:自然科学版,2025,52(1):69~83

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  • 在线发布日期: 2025-01-22
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