Study on Dynamic Splitting Properties of S-PP Hybrid Fiber Concrete after High Temperatures

To study the dynamic tensile mechanical properties of steel polypropylene hybrid fiber reinforced concrete (SP-HFRC) after high temperature, split Hopkinson pressure bar (SHPB) splitting tests were carried out, and optimal content combination was obtained. With plain (PC) as control, effects addition on energy dissipation failure forms specimens temperatures analyzed. LS-DYNA software used to simulate test. The results show that strength increases first then deteriorates with increase temperature. After temperatures, HFRC has a positive negative effect. Among studied mixture combinations, S1PP0.2 (1 vol% + 0.2 fiber) best resistance. Compared PC, by 106.8% at 25 °C 128.2% 800 °C. From perspective energy, we can conclude adding significantly improve toughness defining damage variables better characterize degree concrete. PC cracks seriously while but does not disperse °C, showing ductile characteristics. By modifying some parameters HJC model, state high-temperature be characterized deterioration. simulated process shows an excellent agreement experimental results.