【摘要】：鋼筋混凝土材料由混凝土、鋼筋和兩者之間的粘結(jié)界面組成,鋼筋混凝土的細(xì)觀(guān)結(jié)構(gòu)特征及材料性能決定了其宏觀(guān)表現(xiàn)。分析鋼筋和混凝土之間粘結(jié)界面的材料特性和結(jié)構(gòu)特征,對(duì)了解鋼筋混凝土結(jié)構(gòu)服役過(guò)程中的粘結(jié)失效原理具有重要的指導(dǎo)意義。此外,作為混凝土的重要組成成分,由細(xì)骨料、水泥凈漿構(gòu)成的水泥砂漿中含有大量的初始缺陷。分析細(xì)觀(guān)結(jié)構(gòu)對(duì)水泥砂漿宏觀(guān)性能的影響,有利于水泥砂漿性能的改進(jìn)及新型混凝土材料的研發(fā)。文中分別建立了水泥砂漿多相模型和鋼筋混凝土三相模型,分析討論了細(xì)觀(guān)結(jié)構(gòu)特征對(duì)水泥砂漿和鋼筋混凝土宏觀(guān)行為的影響,為鋼筋混凝土耐久性分析奠定了基礎(chǔ)。本文的主要工作及成果有：建立了水泥砂漿多相模型,相對(duì)于傳統(tǒng)模型,該模型能夠?qū)⑺嗌皾{在拌制過(guò)程中引入的氣泡以初始缺陷的形式體現(xiàn)在該模型當(dāng)中,并控制孔洞的含量及其分布,可以有效的分析水泥凈漿強(qiáng)度和初始缺陷在水泥砂漿軸向拉伸過(guò)程中對(duì)水泥砂漿宏觀(guān)性能的影響。編寫(xiě)了以面積為控制條件的圓形骨料及圓形孔洞隨機(jī)投放程序。該程序可以準(zhǔn)確的控制孔隙率和細(xì)骨料含量,避免手動(dòng)投放骨料和缺陷孔洞的繁瑣過(guò)程,大幅提高模型的建立效率。結(jié)合商用有限元軟件,編寫(xiě)了一套水泥砂漿多相模型分析一體化的程序,有效的降低了模型建立和數(shù)據(jù)結(jié)果提取分析的時(shí)間,為數(shù)值模擬的大批量計(jì)算奠定了基礎(chǔ)。建立了鋼筋混凝土三相模型。該模型根據(jù)實(shí)際觀(guān)測(cè)結(jié)果,將鋼筋與混凝土之間的粘結(jié)界面定義為一層具有一定幾何尺寸和實(shí)際材料特性的第三相材料。在分析鋼筋混凝土粘結(jié)失效原理過(guò)程中,相比將滑移本構(gòu)關(guān)系賦值于無(wú)幾何尺寸的有限元單元,該模型更加合理,符合實(shí)際。利用鋼筋混凝土三相模型,進(jìn)行了鋼筋混凝土拉拔試驗(yàn)過(guò)程的數(shù)值模擬并分析鋼筋混凝土拉拔失效的全過(guò)程,可以有效的分析鋼筋和混凝土之間粘結(jié)界面的細(xì)觀(guān)材料特性的改變對(duì)鋼筋混凝土宏觀(guān)拉拔特性的影響。
[Abstract]:The reinforced concrete material is composed of concrete, steel bar and the bond interface between them. The macro performance of reinforced concrete is determined by its meso-structure characteristics and material properties. The analysis of the material characteristics and structural characteristics of the bond interface between steel bar and concrete is of great significance in understanding the mechanism of bond failure during the service of reinforced concrete structures. In addition, as an important component of concrete, cement mortar composed of fine aggregate and cement paste contains a large number of initial defects. It is beneficial to improve the performance of cement mortar and to develop new concrete material by analyzing the influence of meso structure on the macroscopic properties of cement mortar. In this paper, the multi-phase model of cement mortar and the three-phase model of reinforced concrete are established, and the influence of mesoscopic structure characteristics on the macroscopic behavior of cement mortar and reinforced concrete is analyzed and discussed, which lays a foundation for the durability analysis of reinforced concrete. The main work and achievements of this paper are as follows: the multi-phase model of cement mortar is established. Compared with the traditional model, the model can reflect the bubble introduced in the mixing process of cement mortar in the form of initial defects. The influence of strength and initial defect of cement paste on the macroscopic properties of cement mortar during axial tensile process can be analyzed by controlling the content and distribution of the holes. A program for random placement of circular aggregates and circular voids with area as control condition was written. The program can accurately control the porosity and fine aggregate content, avoid the tedious process of manual loading of aggregate and defective pores, and greatly improve the efficiency of modeling. Combined with the commercial finite element software, a program for the integration of multi-phase model analysis of cement mortar is developed, which effectively reduces the time of model establishment and data extraction and analysis, and lays the foundation for mass calculation of numerical simulation. A three-phase model of reinforced concrete is established. According to the actual observation results, the bond interface between steel bar and concrete is defined as the third phase material with certain geometric size and practical material characteristics. In the process of analyzing the failure principle of reinforced concrete bond, the model is more reasonable than the sliding constitutive relation to the finite element without geometric size. Based on the three-phase model of reinforced concrete, the numerical simulation of the process of reinforced concrete pull-out test is carried out and the whole process of the failure of reinforced concrete pull-out is analyzed. It can be used to analyze the effect of the change of mesomaterial characteristics of the bond interface between steel bar and concrete on the macroscopic drawing behavior of reinforced concrete.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU375

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