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为研究再生混凝土筒体的抗火性能,进行了1个普通混凝土筒体和2个再生混凝土筒体的抗火性能试验,比较分析了其耐火极限及温度场分布的差异。基于试验,对筒体温度场进行了数值模拟,研究了不同筒体壁厚对其温度场分布的影响,提出了再生混凝土筒体在高温作用下的承载力计算公式。通过算例,研究了8个不同壁厚、不同混凝土材料筒体的承载力和耐火极限。研究表明:壁厚相同时,再生混凝土筒体比普通混凝土筒体的耐火极限相对短些,耐火性能相对差些;随着筒体壁厚的增加,再生混凝土筒体在高温作用下的承载力增大,耐火极限增长,抗火性能增强,与普通混凝土筒体有相似的规律。
In order to study the fire resistance of recycled concrete cylinder, the fire resistance performance of one ordinary concrete cylinder and two recycled concrete cylinder was tested. The difference of fire resistance and temperature field distribution was analyzed. Based on the experiment, the temperature field of the cylinder was numerically simulated, the influence of different cylinder wall thickness on the temperature field distribution was studied, and the bearing capacity formula of recycled concrete cylinder under high temperature was put forward. Through an example, the bearing capacity and fire resistance of eight different wall thickness and different concrete materials were studied. The results show that when the wall thickness is the same, the regenerated concrete cylinder body has a relatively shorter fire resistance than ordinary concrete cylinder body and relatively poor fire resistance. With the increase of cylinder wall thickness, the bearing capacity of regenerated concrete cylinder body under high temperature increases Large, fire-resistant growth limit, enhanced fire resistance, and ordinary concrete cylinder has a similar rule.