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本文对盾构法隧道管片有应用前景的纤维混凝土的高温后抗压性能进行了试验研究,分析了分别掺入钢纤维和聚丙烯纤维的C50混凝土高温后残余抗压强度的劣化规律,探讨了纤维、温升速率、冷却方式对混凝土高温后性能的影响机理,分析了纤维混凝土的受压应力-应变关系。研究结果表明:经历温度越高,纤维混凝土强度损失越大;纤维种类、温升速率、冷却方式均可影响混凝土的高温后抗压性能;给出基于试验结果的C50纤维混凝土高温后受压应力-应变曲线拟合方程。
In this paper, the compressive properties of fiber reinforced concrete with tunneling tunnels after high temperature were studied. The degradation of residual compressive strength of C50 concrete with steel fiber and polypropylene fiber were analyzed. The influence mechanism of fiber, temperature rising rate and cooling mode on the performance of concrete after high temperature was analyzed. The compressive stress-strain relationship of fiber reinforced concrete was analyzed. The results show that the higher the temperature, the greater the fiber concrete loss; the fiber type, the temperature rise rate and the cooling mode all affect the compressive property of the concrete after high temperature. Based on the test results, the compressive stress of C50 fiber reinforced concrete after high temperature - Strain curve fitting equation.