【摘要】 研究高温对不同钢纤维掺量的钢纤维混凝土的抗拉、劈拉强度的影响结果,对影响机理进行了简单的分析。结果表明,钢纤维混凝土高温后的抗压、劈拉强度随所受最高温的升高而缓慢下降,400℃以后下降稍快。与素混凝土相比,掺2%钢纤维的抗压强度与劈拉强度残余率分别可提高27.6%和9.3%左右。采用有限元软件ANSYS对混凝土加热过程中的温度场与应力场进行分析,提出了混凝土高温下开裂损伤判据。更多还原

【Abstract】 In this paper the influence of high temperature on the compressive and splitting strength of the steel-fiber reinforced concrete with different dosage of steel-fiber was investigated.The mechanism of the influence was simply analyzed.The compressive and splitting strength of SFRC decrease slowly with the increasing of heating temperature.It decreases a little faster when temperature is above 400 ℃.Compared with the common concrete,the residual compressive and splitting strength rate of SFRC(2%) are much higher about 27.6% and 9.3% respectively.The finite element software ANSYS was adopted to analyze the changes of the temperature and stress field for the steel-fiber reinforced concrete during the heating up process.The failure criterion of the steel-fiber reinforced concrete crack damage in high temperature was brought out.更多还原