钢纤维混凝土高温损伤及温度应力模拟

Damage and Thermal Stress Simulation of Steel-fiber Reinforced Concrete Exposed to High Temperature

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。

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 hig...