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

【摘要】：混凝土碳化會引起鋼筋混凝土結(jié)構(gòu)的耐久性劣化，從而對結(jié)構(gòu)的承載能力及正常使用性能產(chǎn)生重要的影響。鋼筋和混凝土的可靠粘結(jié)才能保證鋼筋混凝土結(jié)構(gòu)的正常工作，然而碳化會改變混凝土材料的自身性能，必然會影響鋼筋與混凝土之間的粘結(jié)性能。目前，雖然有許多關(guān)于鋼筋與混凝土粘結(jié)性能的研究，但是考慮混凝土碳化對粘結(jié)性能影響的研究幾乎沒有。此外，鋼筋混凝土結(jié)構(gòu)在地震等反復(fù)荷載作用下的動力反應(yīng)與鋼筋和混凝土的粘結(jié)性能緊密相關(guān)，因此，開展反復(fù)荷載作用下碳化混凝土與鋼筋粘結(jié)性能的研究具有重要的理論和現(xiàn)實(shí)意義。 首先，本文對C20、C30、C40三種強(qiáng)度等級的鋼筋混凝土試件進(jìn)行快速完全碳化，測出未碳化和完全碳化的標(biāo)準(zhǔn)立方體試塊的抗壓強(qiáng)度，然后對所有粘結(jié)試件進(jìn)行單調(diào)與反復(fù)荷載作用下的鋼筋拉拔試驗(yàn)，得到相應(yīng)的粘結(jié)—滑移曲線。 其次，本文通過對比未碳化試件與完全碳化試件的粘結(jié)—滑移曲線，分析碳化對混凝土與變形鋼筋粘結(jié)性能的影響。研究發(fā)現(xiàn)碳化提高了混凝土自身的抗壓強(qiáng)度，從而也增強(qiáng)了試件的粘結(jié)強(qiáng)度、初期加載的粘結(jié)剛度以及耗能能力，并對反復(fù)加載下的粘結(jié)性能退化有一定的改善作用。 最后，在試驗(yàn)數(shù)據(jù)的基礎(chǔ)上，根據(jù)已有的經(jīng)驗(yàn)?zāi)Ｐ徒握{(diào)與反復(fù)荷載作用下碳化混凝土與變形鋼筋的粘結(jié)—滑移本構(gòu)關(guān)系。 本文從混凝土自身材料的性能變化出發(fā)，不考慮混凝土碳化后鋼筋銹蝕的影響，通過試驗(yàn)研究了反復(fù)荷載作用下碳化混凝土與變形鋼筋之間的粘結(jié)性能，對將來鋼筋混凝土結(jié)構(gòu)的耐久性評估及抗震性能研究具有重要的理論參考意義。
[Abstract]:Concrete carbonation will cause durability deterioration of reinforced concrete structure, which will have an important impact on the bearing capacity and normal service performance of the structure. The reliable bond between steel bar and concrete can ensure the normal work of reinforced concrete structure. However, carbonization will change the performance of concrete material and will inevitably affect the bond performance between steel bar and concrete. At present, although there are a lot of researches on the bond behavior of steel bar and concrete, there is almost no research on the effect of concrete carbonization on bond performance. In addition, the dynamic response of reinforced concrete structures under seismic and other repeated loads is closely related to the bond properties of steel bars and concrete. It is of great theoretical and practical significance to study the bond behavior of carbonized concrete and reinforcement under repeated loads. First of all, in this paper, the reinforced concrete specimens with three different strength grades, C20C30C40, are carbonized rapidly, and the compressive strength of uncarbonated and fully carbonized standard cube specimens is measured. Then all the bonded specimens are tested under monotone and repeated loads and the corresponding bond-slip curves are obtained. Secondly, by comparing the bond-slip curves between uncarbonated specimens and fully carbonized specimens, the effects of carbonation on the bond properties of concrete and deformed steel bars are analyzed. It is found that carbonation improves the compressive strength of concrete itself, and thus enhances the bond strength of the specimen, the initial loading bond stiffness and the energy dissipation ability, and it also improves the degradation of the bond performance under repeated loading. Finally, based on the experimental data, the bond-slip constitutive relationship between carbonized concrete and deformed steel bar under monotone and repeated loads is established according to the existing empirical model. In this paper, based on the performance change of concrete material, the bond behavior between carbonized concrete and deformed steel bar under repeated loading is studied by experiments without considering the effect of corrosion of steel bar after carbonization. It has important theoretical reference significance for durability evaluation and seismic performance research of reinforced concrete structures in the future.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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本文編號：2071097