本文選題：凍融混凝土 + 變形鋼筋��； 參考：《西安建筑科技大學(xué)》2014年碩士論文

【摘要】：我國(guó)部分地區(qū)處于寒冷地帶，這些地區(qū)的混凝土建筑經(jīng)常遭受凍融破壞，，對(duì)混凝土的各項(xiàng)性能產(chǎn)生了很大影響。目前，對(duì)凍融后混凝土構(gòu)件的抗震性能，國(guó)內(nèi)外學(xué)者開展的研究工作相對(duì)較少。 首先，本文對(duì)C30、C40、C50三種強(qiáng)度的鋼筋混凝土試件分別進(jìn)行0次、100次、200次、300次的凍融試驗(yàn)，對(duì)試驗(yàn)結(jié)果進(jìn)行分析總結(jié)，并在此基礎(chǔ)上得到了混凝土強(qiáng)度等級(jí)和凍融次數(shù)與混凝土抗壓強(qiáng)度、質(zhì)量損失率和相對(duì)動(dòng)彈模量之間的關(guān)系。又進(jìn)一步進(jìn)行加載試驗(yàn)，得到了不同強(qiáng)度不同凍融循環(huán)次數(shù)下鋼筋與混凝土試件在單調(diào)與反復(fù)荷載作用下的粘結(jié)-滑移曲線。 其次，對(duì)單調(diào)試驗(yàn)數(shù)據(jù)分析后，總結(jié)出曲線特征，得到了不同強(qiáng)度下極限粘結(jié)強(qiáng)度、峰值滑移、殘余強(qiáng)度與凍融循環(huán)次數(shù)之間的關(guān)系。對(duì)反復(fù)試驗(yàn)數(shù)據(jù)分析后，對(duì)比單調(diào)試驗(yàn)數(shù)據(jù)，引入粘結(jié)退化率、摩阻力退化率和殘余粘結(jié)應(yīng)力退化率，得到了它們與凍融循環(huán)次數(shù)和混凝土強(qiáng)度等級(jí)的關(guān)系。 最后，根據(jù)試驗(yàn)數(shù)據(jù)，建立單調(diào)加載下凍融混凝土與變形鋼筋粘結(jié)滑移本構(gòu)關(guān)系和反復(fù)加載條件下凍融混凝土與變形鋼筋粘結(jié)滑移循環(huán)加載曲線的本構(gòu)關(guān)系，通過引入殘余粘結(jié)應(yīng)力退化率、粘結(jié)退化損失率和關(guān)鍵參數(shù)的方法最終得到反復(fù)加載條件下凍融混凝土與變形鋼筋粘結(jié)滑移本構(gòu)關(guān)系。
[Abstract]:Some parts of our country are in the cold zone, the concrete buildings in these areas are often damaged by freezing and thawing, which has a great influence on the performance of concrete. At present, there are few researches on seismic behavior of freeze-thawed concrete members at home and abroad. First of all, in this paper, three kinds of reinforced concrete specimens with C _ (30) C _ (40) C _ (50) and C _ (30) C _ (40) C _ (50) have been subjected to the freezing and thawing tests of 100 times, 200 times and 300 times respectively, and the test results are analyzed and summarized. On this basis, the relationship between concrete strength grade, freeze-thaw times and compressive strength, mass loss rate and relative dynamic modulus of concrete is obtained. Furthermore, the bond slip curves of steel bars and concrete specimens under monotonic and repeated loads are obtained under different strength and different freeze-thaw cycles. Secondly, after analyzing the monotonic test data, the curve characteristics are summarized, and the relationship between ultimate bond strength, peak slip, residual strength and freeze-thaw cycle times under different strength is obtained. After analyzing the repeated test data, compared with the monotonic test data, the bond degradation rate, friction degradation rate and residual bond stress degradation rate are introduced, and the relationship between them and the number of freeze-thaw cycles and the strength grade of concrete is obtained. Finally, based on the experimental data, the bond-slip constitutive relation between freeze-thawed concrete and deformed steel bar under monotone loading and the constitutive relation between freeze-thawed concrete and deformed steel bar under repeated loading are established. By introducing residual bond stress degradation rate, bond degradation loss rate and key parameters, the bond-slip constitutive relationship between freeze-thawed concrete and deformed steel bar under repeated loading is 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】：2014
【分類號(hào)】：TU528

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本文編號(hào)：2016774