【摘要】：碳化是造成混凝土結(jié)構(gòu)耐久性損傷的主要因素之一，對混凝土力學(xué)性能產(chǎn)生很大影響。鋼筋混凝土結(jié)構(gòu)能夠正常工作是基于鋼筋與混凝土二者的粘結(jié)作用。碳化改變了混凝土自身性能，從而導(dǎo)致鋼筋混凝土結(jié)構(gòu)粘結(jié)性能下降。然而，目前針對鋼筋與碳化混凝土粘結(jié)性能的理論數(shù)據(jù)和試驗研究還很匱乏，本論文對反復(fù)荷載作用下鋼筋與碳化混凝土的粘結(jié)性能進行試驗研究，可以進一步完善既有鋼筋混凝土結(jié)構(gòu)抗震性能評估理論，同時對混凝土結(jié)構(gòu)工程防災(zāi)減災(zāi)具有重大的理論意義和工程價值。 論文首先采用C20、C30、C40三批鋼筋混凝土試件進行完全碳化試驗，并通過標(biāo)準(zhǔn)立方體試件測定出未碳化和完全碳化混凝土的抗拉強度，然后通過反復(fù)加載試驗，對試件施加單調(diào)及反復(fù)荷載，得到每批試件在單調(diào)和反復(fù)荷載作用下的粘結(jié)—滑移曲線。同樣，，對相同批次的未碳化試件施加單調(diào)及反復(fù)荷載，得到相應(yīng)的粘結(jié)—滑移曲線。 其次，論文通過對未碳化和完全碳化試件的粘結(jié)—滑移曲線進行比較，分析碳化對鋼筋混凝土粘結(jié)性能的影響，通過引入粘結(jié)應(yīng)力退化率，說明了反復(fù)加載循環(huán)次數(shù)對于鋼筋混凝土粘結(jié)性能的影響，并全面分析對比了未碳化和完全碳化后鋼筋混凝土試件的粘結(jié)性能。 再次，論文通過采用單調(diào)及反復(fù)荷載試驗，重點研究分析了混凝土碳化這一因素，對鋼筋混凝土粘結(jié)性能的影響，建立了反復(fù)荷載作用下鋼筋與完全碳化混凝土粘結(jié)性能的本構(gòu)關(guān)系，為分析反復(fù)荷載作用下鋼筋與碳化混凝土的粘結(jié)性能打下了基礎(chǔ)。 本文基于反復(fù)荷載作用下鋼筋與碳化混凝土粘結(jié)性能的試驗研究成果，掌握了鋼筋與碳化混凝土粘結(jié)規(guī)律，深化了對此粘結(jié)規(guī)律的認(rèn)識，為日后實踐提供了理論依據(jù)。
[Abstract]:Carbonation is one of the main factors causing durability damage of concrete structures, which has a great impact on the mechanical properties of concrete. The normal operation of reinforced concrete structure is based on the bond between steel bar and concrete. Carbonation changes the performance of concrete itself, which leads to the decrease of bond behavior of reinforced concrete structure. However, at present, there is still a lack of theoretical data and experimental research on the bond behavior between steel bar and carbonized concrete. In this paper, the experimental study on the bond behavior between steel bar and carbonized concrete under cyclic loading can further improve the existing seismic performance evaluation theory of reinforced concrete structures. At the same time, it is of great theoretical significance and engineering value for concrete structure engineering disaster prevention and mitigation. In this paper, three batches of reinforced concrete specimens, C20, C30 and C40, are used to carry out complete carbonation tests, and the tensile strength of uncarbonized and fully carbonized concrete is measured by standard cube specimens. Then, the bond-slip curves of each batch of specimens under monotone and repeated loads are obtained by applying monotonic and repeated loads to the specimens through repeated loading tests. Similarly, the corresponding bond-slip curves are obtained by applying monotone and repeated loads to the uncarbonized specimens of the same batch. Secondly, by comparing the bond-slip curves of uncarbonized and fully carbonized specimens, this paper analyzes the effect of carbonation on the bond properties of reinforced concrete, explains the influence of cyclic times of repeated loading on the bond properties of reinforced concrete by introducing the bond stress degradation rate, and comprehensively analyzes and compares the bond properties of reinforced concrete specimens after carbonation and complete carbonation. Thirdly, by means of monotone and cyclic load tests, this paper focuses on the influence of concrete carbonation on the bond behavior of reinforced concrete, and establishes the constitutive relation of bond behavior between steel bar and fully carbonized concrete under cyclic loading, which lays a foundation for analyzing the bond behavior between steel bar and carbonized concrete under cyclic loading. Based on the experimental results of bond behavior between steel bar and carbonized concrete under cyclic loading, this paper grasps the bond law between steel bar and carbonized concrete, deepens the understanding of this bond law, and provides a theoretical basis for future practice.
【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】：2013
【分類號】：TU375

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