【摘要】：用高溫加熱系統(tǒng)對(duì)C30、C50兩種強(qiáng)度等級(jí)混凝土在不同溫度條件下進(jìn)行均勻加熱,經(jīng)自然冷卻后用Φ75mm SHPB(Split-Hopkinson Press Bar)實(shí)驗(yàn)裝置、超聲波測(cè)量技術(shù)及試驗(yàn)壓力機(jī)對(duì)高溫前后混凝土試件進(jìn)行動(dòng)態(tài)沖擊與靜態(tài)抗壓試驗(yàn)。結(jié)果表明,隨溫度升高縱波波速、彈性模量及靜態(tài)抗壓強(qiáng)度均出現(xiàn)不同程度減小,總體趨勢(shì)一致;損傷隨溫度升高不斷增大,在溫度400℃、700℃處為明顯變化轉(zhuǎn)折點(diǎn);經(jīng)不同高溫冷卻后,混凝土動(dòng)態(tài)破壞強(qiáng)度不斷降低、峰值應(yīng)變不斷增大、應(yīng)力-應(yīng)變曲線趨平緩,出現(xiàn)塑性流動(dòng)現(xiàn)象且隨溫度升高愈加明顯。
[Abstract]:The concrete of C30 and C50 strength grades was uniformly heated under different temperature conditions by a high-temperature heating system. After natural cooling, 桅75mm SHPB(Split HopkinsonPressBar)test device was used. The results showed that the longitudinal wave velocity, elastic modulus and static compressive strength decreased to different degrees with the increase of temperature. The damage increases with the increase of temperature, which is a significant change turning point at 400鈩，

本文編號(hào)：2520949