高溫后混凝土材料的沖擊力學(xué)性能試驗(yàn)研究
本文關(guān)鍵詞:高溫后混凝土材料的沖擊力學(xué)性能試驗(yàn)研究 出處:《湖南大學(xué)》2015年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: 混凝土 高溫后 分離式霍普金森壓桿(SHPB) 動態(tài)強(qiáng)度增大系數(shù)(DIF) 微觀試驗(yàn)
【摘要】:近年來,恐怖襲擊事件及建筑火災(zāi)事故頻發(fā),在高溫和沖擊荷載作用下建筑結(jié)構(gòu)一旦喪失承載能力發(fā)生整體坍塌將造成巨大的生命財(cái)產(chǎn)損失;炷敛牧细邞(yīng)變率下的動態(tài)力學(xué)性能和高溫靜態(tài)力學(xué)性能研究已經(jīng)比較成熟,但混凝土在沖擊荷載和火災(zāi)聯(lián)合作用下的力學(xué)性能研究比較少見,且目前有限的研究也大多采用小桿徑(小于100mm)的SHPB裝置進(jìn)行。本文運(yùn)用湖南大學(xué)φ100mm大桿徑分離式霍普金森壓桿(Split Hopkinson Pressure Bar,簡稱SHPB)裝置進(jìn)行了高溫后混凝土的沖擊力學(xué)性能試驗(yàn),同時還進(jìn)行了高溫后混凝土的微觀結(jié)構(gòu)試驗(yàn)研究,主要包括以下幾個方面的研究工作:(1)鑒于材料沖擊荷載作用下應(yīng)變率效應(yīng)分析的需要,首先進(jìn)行高溫后混凝土的靜態(tài)抗壓強(qiáng)度試驗(yàn),并對國內(nèi)外有關(guān)高溫后混凝土靜態(tài)抗壓試驗(yàn)研究文獻(xiàn)進(jìn)行統(tǒng)計(jì),探究高溫后混凝土殘余抗壓強(qiáng)度變化規(guī)律的復(fù)雜性。(2)以溫度和沖擊速度為試驗(yàn)參數(shù)進(jìn)行高溫后混凝土的SHPB沖擊壓縮力學(xué)性能試驗(yàn),分析溫度和應(yīng)變率對高溫后混凝土動態(tài)沖擊應(yīng)力-應(yīng)變曲線特征的影響規(guī)律。(3)與其它學(xué)者小桿徑SHPB沖擊試驗(yàn)結(jié)果進(jìn)行對比,探究高溫后混凝土的動態(tài)強(qiáng)度增大系數(shù)(DIF)的變化規(guī)律,進(jìn)行高溫后混凝土SHPB沖擊作用下的應(yīng)變率效應(yīng)和尺寸效應(yīng)分析。(4)進(jìn)行高溫后混凝土及水泥漿體的熱重分析(TG)、電鏡掃描(SEM)和壓汞(MIP)試驗(yàn),得到高溫后混凝土的組成成分和微觀結(jié)構(gòu)變化規(guī)律,揭示高溫后混凝土動、靜態(tài)力學(xué)性能的高溫?fù)p傷機(jī)理。
[Abstract]:In recent years, terrorist attacks and building fire accidents occur frequently. Under the action of high temperature and impact load, the whole collapse of building structure will cause great loss of life and property. Study on dynamic and static mechanical properties of concrete materials at high strain rate. It's mature. However, the mechanical properties of concrete under the combined action of impact load and fire are rare. At present, most of the limited researches are carried out with SHPB device with small rod diameter (less than 100mm). In this paper, the split Hopkinson pressure bar with 蠁 100mm large diameter is used in Hunan University. Split Hopkinson Pressure Bar. The impact mechanical properties of concrete after high temperature were tested and the microstructure of concrete after high temperature was studied. In view of the need of strain rate effect analysis under the impact load of materials, the static compressive strength test of concrete after high temperature is carried out. And the domestic and foreign literature on static compressive test of concrete after high temperature is statistically analyzed. Explore the complexity of the variation law of residual compressive strength of concrete after high temperature. (2) take temperature and impact velocity as test parameters to test the SHPB impact compression mechanical properties of concrete after high temperature. This paper analyzes the influence of temperature and strain rate on the characteristics of dynamic shock stress-strain curve of concrete after high temperature. To explore the dynamic strength increase coefficient of concrete after high temperature and the change law of DIFs. The strain rate effect and size effect of concrete under the impact of SHPB after high temperature are analyzed. (4) the thermogravimetric analysis of concrete and cement paste after high temperature is carried out. The composition and microstructure of concrete after high temperature were obtained by scanning electron microscopy (SEM) and mercury injection MIP tests, and the damage mechanism of dynamic and static mechanical properties of concrete at high temperature was revealed.
【學(xué)位授予單位】:湖南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU528
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