【摘要】：凍融損傷已成為混凝土結(jié)構(gòu)耐久性研究的重要課題之一。我國(guó)很多地區(qū)冬季氣候嚴(yán)寒，加之混凝土結(jié)構(gòu)在安全使用期內(nèi)常遭受單調(diào)或重復(fù)加卸載作用，因此本文對(duì)凍融損傷混凝土單調(diào)及重復(fù)荷載作用下的應(yīng)力 應(yīng)變關(guān)系進(jìn)行研究，為混凝土結(jié)構(gòu)抗震性能評(píng)估提供基礎(chǔ)數(shù)據(jù)，對(duì)混凝土結(jié)構(gòu)防災(zāi)減災(zāi)具有重要的理論研究?jī)r(jià)值。 本文對(duì)混凝土棱柱體試塊進(jìn)行最高次數(shù)為400次的凍融循環(huán)試驗(yàn)，并測(cè)量試塊的質(zhì)量及動(dòng)彈性模量，建立質(zhì)量損失率、相對(duì)動(dòng)彈性模量與凍融循環(huán)次數(shù)之間的關(guān)系式；對(duì)凍融次數(shù)分別為0、100、200、300、400次的五組試塊進(jìn)行等應(yīng)變速率的單調(diào)和重復(fù)加載試驗(yàn)，分析其破壞形態(tài)，，對(duì)比研究了單調(diào)與重復(fù)加載破壞形態(tài)的差異，并分別得出了單調(diào)與重復(fù)荷載下的峰值應(yīng)力、峰值應(yīng)變與凍融循環(huán)次數(shù)間的關(guān)系式，得到不同凍融循環(huán)次數(shù)后混凝土的應(yīng)力 應(yīng)變?nèi)�。 針對(duì)五組單調(diào)與重復(fù)加載的應(yīng)力 應(yīng)變?nèi)�試驗(yàn)結(jié)果進(jìn)行了深入的分析：首先，采用matlab軟件對(duì)單調(diào)荷載作用下應(yīng)力 應(yīng)變曲線的上升段和下降段進(jìn)行擬合，得出上升段的參數(shù)a和下降段的參數(shù)b，建立二者與凍融次數(shù)N的關(guān)系；其次，對(duì)重復(fù)荷載作用下的卸載曲線進(jìn)行擬合，得到卸載參數(shù)n，采用以n=1+0.7ε u/εp為原型修改參數(shù)值的公式n=1+sε u/εp得出參數(shù)s，并建立了參數(shù)s與凍融循環(huán)次數(shù)N之間的關(guān)系方程；最后，對(duì)重復(fù)荷載作用下的再加載曲線進(jìn)行擬合，得到再加載參數(shù)n、α在不同凍融循環(huán)次數(shù)下的分布規(guī)律。
[Abstract]:Freeze-thaw damage has become one of the most important research topics in the durability of concrete structures. In many areas of China, the winter climate is severe, and concrete structures are often subjected to monotone or repeated loading and unloading in the safe life. Therefore, the stress strain relationship of freeze-thaw damaged concrete under monotone and repeated loads is studied in this paper. It provides basic data for seismic performance evaluation of concrete structures and has important theoretical research value for the prevention and mitigation of concrete structures. In this paper, the maximum number of freeze-thaw test of concrete prism is 400 times, and the mass and dynamic elastic modulus of concrete prism are measured, and the relationship between mass loss rate, relative dynamic elastic modulus and freeze-thaw cycle times is established. Five groups of specimens with freezing and thawing times of 0 100 200 300 400 times were subjected to monotone and repeated loading tests with equal strain rate. The failure patterns were analyzed and the difference between monotone and repeated loading failure patterns was compared. The relationship between peak stress, peak strain and freeze-thaw cycle times under monotone and repeated loads is obtained, and the full stress-strain curves of concrete under different freeze-thaw cycles are obtained. The experimental results of five groups of stress-strain curves under monotone and repeated loading are analyzed. Firstly, the ascending and descending sections of the stress-strain curves under monotone loading are fitted by matlab software. The relation between the parameters a of rising section and the parameter of descending section b and the number of freeze-thaw times N is established. Secondly, the unloading curve under repeated load is fitted. The unloading parameter (n) is obtained. The formula of nnn1s 蔚 u / 蔚 p is used to modify the parameter value, and the relation equation between the parameter s and the number of freeze-thaw cycles N is established. Finally, the reloading curve under repeated load is fitted. The distribution of the reloading parameters n and 偽 under different freeze-thaw cycles was obtained.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528.0

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