【摘要】：采用ф100分離式霍普金森壓桿系統(tǒng),研究了不同溫度作用后玄武巖纖維增強(qiáng)混凝土(BFRC)的沖擊變形特性.結(jié)果表明:隨著溫度及加載速率的升高,BFRC的變形破碎程度增大,應(yīng)力-應(yīng)變曲線表現(xiàn)出塑性特征;同一溫度下,BFRC的峰值應(yīng)變和均值應(yīng)變隨平均應(yīng)變率的增大而增大,具有明顯的應(yīng)變率相關(guān)性;同一加載速率下,隨著溫度的升高,BFRC的峰值應(yīng)變和均值應(yīng)變呈上升趨勢,峰值應(yīng)變的應(yīng)變率敏感性逐漸增強(qiáng),但在200℃時(shí),BFRC在較低加載速率作用下的均值應(yīng)變較常溫有所減小;摻入玄武巖纖維可以有效提升高溫后BFRC的沖擊變形能力,且纖維摻量(體積分?jǐn)?shù))為0.3%時(shí),BFRC的變形優(yōu)勢最大,但當(dāng)溫度與加載速率較低時(shí),BFRC的均值應(yīng)變較素混凝土小.
[Abstract]:The impact deformation characteristics of basalt fiber reinforced concrete (BFRC) under different temperatures were studied by using a separate Hopkinson pressure bar system. The results show that with the increase of temperature and loading rate, the deformation and fracture degree of BFRC increases, the stress-strain curve shows plastic characteristics, and the peak strain and mean strain of BFRC increase with the increase of average strain rate at the same temperature. Under the same loading rate, the strain rate sensitivity of the peak strain increased with the increase of the temperature and the mean strain. But at 200 鈩，

本文編號：2222471