Influence of Recycled Concrete Strength on Fire Resistant Performance of Tubular Structures
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摘要: 为进一步推动再生混凝土的应用,对再生混凝土构件的耐火性能进行了试验研究.设计了2个再生混凝土强度等级分别为C20和C30的全再生钢筋混凝土筒体模型,再生粗骨料及细骨料取代率均为100%.在试验炉内对筒体施加竖向轴力,并按标准曲线升温,进行了筒体模型在轴力及高温共同作用下的试验研究.对比分析了2个模型的耐火极限、温度场、破坏特征、墙体挠度及竖向位移.利用ABAQUS软件,模拟分析了筒体内部温度场并与试验结果进行了对比,两者符合较好.研究表明,随再生混凝土强度的提高,筒体的耐火性能逐渐降低,耐火极限下降,易发生高温膨胀破坏.Abstract: The fire-resistant performance of recycled concrete member was studied to further promote the application of recycled concrete.Two concrete tubular structure models with different concrete strengths were designed and tested under both vertical load and high temperature according to the standard heating curve in the test furnace.The two models were made from recycled concrete with both the coarse and fine aggregate replacement rate of 100%.Their recycled concrete was specified as C20 and C30,respectively.The fire endurance,temperature field,failure characteristic,wall deflection and vertical displacement were comparatively analyzed.The recycled concrete temperature field of the specimens was also simulated by running ABAQUS software and they agreed well with the experimental results.Resultsshow that with the increase of the strength of recycled concrete,fire endurance and fire resistance of the tubular structure decrease and the structure tends to fail in expansion under high temperature.
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Keywords:
- recycled concrete /
- concrete strength /
- tubular structure /
- temperature field /
- fire endurance
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