發(fā)布時(shí)間：2018-02-23 00:55

  本文關(guān)鍵詞： 混凝土 應(yīng)變率效應(yīng) 動(dòng)態(tài)拉伸強(qiáng)度 動(dòng)態(tài)強(qiáng)化因子　出處：《高壓物理學(xué)報(bào)》2017年05期 　論文類型：期刊論文

【摘要】：混凝土是重要的工程材料,研究其在動(dòng)態(tài)作用下的力學(xué)性能具有極其重要的意義與價(jià)值�；炷敛牧系膭�(dòng)態(tài)拉伸強(qiáng)度具有明顯的應(yīng)變率效應(yīng),而且在低應(yīng)變率與高應(yīng)變率條件下的動(dòng)態(tài)強(qiáng)化因子ψDIF(DIF:Dynamic Increase Factor)與應(yīng)變率的關(guān)系具有明顯的區(qū)別。參考現(xiàn)有的相關(guān)綜述文獻(xiàn),收集近二十余年來大量的混凝土動(dòng)態(tài)拉伸試驗(yàn)結(jié)果數(shù)據(jù),結(jié)合理論分析,探討了在不同應(yīng)變率階段混凝土材料拉伸強(qiáng)度動(dòng)態(tài)強(qiáng)化因子的變化規(guī)律,以及不同試驗(yàn)手段如直接拉伸、動(dòng)態(tài)劈裂與層裂等對(duì)拉伸動(dòng)態(tài)強(qiáng)化因子的影響規(guī)律。最后對(duì)試驗(yàn)結(jié)果進(jìn)行擬合,得到混凝土材料在不同應(yīng)變率區(qū)間時(shí)拉伸強(qiáng)度動(dòng)態(tài)強(qiáng)化因子的預(yù)測(cè)表達(dá)式。研究表明:(1)混凝土材料的動(dòng)態(tài)強(qiáng)化因子ψDIF隨著應(yīng)變率的增加呈遞增趨勢(shì),ψDIF-lnε·-具有類似的線性關(guān)系;(2)混凝土材料的拉伸強(qiáng)度ψDIF值隨應(yīng)變率增加而遞增的趨勢(shì)在3個(gè)不同應(yīng)變率階段,斜率明顯不同,在高應(yīng)變率時(shí)變化趨勢(shì)最明顯;(3)無論是低應(yīng)變率區(qū)間還是高應(yīng)變率區(qū)間,混凝土的動(dòng)態(tài)拉伸強(qiáng)度ψDIF值與試驗(yàn)方式(直接拉伸、動(dòng)態(tài)劈裂、層裂及其他方式)并沒有明顯的關(guān)系。
[Abstract]:Concrete is an important engineering material. It is of great significance and value to study its mechanical properties under dynamic action. The dynamic tensile strength of concrete material has obvious strain rate effect. Moreover, the relationship between the dynamic hardening factor 蠄 DIF(DIF:Dynamic Increase Increase and the strain rate under the condition of low strain rate and high strain rate is obviously different. Referring to the relevant literature, a large number of dynamic tensile test results of concrete have been collected in the past 20 years. Based on the theoretical analysis, the variation law of dynamic strengthening factors of concrete tensile strength at different strain rates and different test methods such as direct tension are discussed. The effect of dynamic splitting and spallation on tensile dynamic strengthening factor is studied. The prediction expression of dynamic strengthening factor of tensile strength of concrete material at different strain rate ranges is obtained. The study shows that the dynamic strengthening factor 蠄 DIF of concrete material increases with the increase of strain rate, and 蠄 DIF-ln 蔚-has a similar value. The tensile strength 蠄 DIF value of concrete material increases with the increase of strain rate in three different strain rate stages. The dynamic tensile strength (DIF) of concrete is different from that of the test method (direct tension, dynamic splitting, direct tension, dynamic splitting), whether in low strain rate range or high strain rate interval, the slope is obviously different, and the change trend is most obvious at high strain rate, no matter in low strain rate range or high strain rate interval, the dynamic tensile strength of concrete is different. Spallation and other means) have no obvious relationship.
【作者單位】： 南京理工大學(xué)機(jī)械工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(11472008,11202206) 教育部博士點(diǎn)專項(xiàng)基金(20123415120001) 中國(guó)博士后科學(xué)基金(2011M501057) 力學(xué)浙江省重中之重學(xué)科開放基金(XKLX1513) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金(30915118801)
【分類號(hào)】：TU528

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