一种新型自保温过梁抗弯及保温性能试验分析

对研制的一种通过在梁内开缝并填充保温材料来阻断冷热桥实现自保温功能的过梁进行了试验分析.进行了2根实心过梁和8根自保温过梁的抗弯性能试验.试验结果表明,自保温过梁中外叶梁和内叶梁的协调工作性能良好,在正常使用极限状态下的实测最大裂缝宽度均小于短期荷载下的限值,能满足正常使用要求.同时,开缝和宽度比对初裂荷载和破坏模式基本没有影响.此外,虽然开缝导致自保温过梁承载力略小于实心过梁,但两者承载力的差值不明显.自保温过梁的传热系数值比实心过梁下降65%,热工性能明显优于实心过梁.

Experimental Analysis of the Flexural and Thermal Performance of One New Self-insulation Lintel

This study conducted a test to analyze the self-insulation lintel by filling the slit in lintel with the insulation materials to prevent the thermal bridge. Two solid lintels and eight self-insulation lintels were tested to study their flexural properties. The result shows that both the outer wythe and the inner wythe of the self-insulation lintels cooperate well with each other. The measured maximum crack width under the limit state of normal use is smaller when compared with the limit value under short-term load, so it can meet the normal requirement. In addition, the slit and width ratio of the self-insulation lintels has little effect on the initial crack load and failure mode, and because of the slit, the ultimate strength of the self-insulation lintels is slightly less than the solid lintels, while the difference is obvious. Though the heat-transferring coefficient of the self-insulation lintels decreases by 65% compared with the solid lintels, it has much better thermal performance.