本文選題：超高韌性水泥基復合材料 + 簡支梁�。� 參考：《合肥工業(yè)大學》2014年博士論文

【摘要】：超高韌性水泥基復合材料是以水泥作為基本粘結料,加上小粒徑細骨料作為基體,再加入體積摻量2%左右的聚乙烯醇纖維作增強材料配制而成的新型建筑材料。這種材料的特點不同于以前的纖維增強材料,依靠通過增加大體積含量的纖維來獲得高性能,而是基于材料微觀結構設計的一種具有超高韌性的新型復合材料,這種材料在荷載作用下具有明顯的應變硬化特征,在直接拉伸作用下可產(chǎn)生多條細微裂縫,穩(wěn)定的拉應變能夠達到3%左右。 為了研究超高韌性水泥基復合材料的力學性質(zhì)及構件受剪性能,本文圍繞“一種材料、兩種構件、三個重點”來進行研究,以獲得超高韌性水泥基復合材料基本物理力學性能和構件的承載力及變形特性。一種材料為超高韌性水泥基復合材料；兩種構件為超高韌性水泥基復合材料簡支梁以及超高韌性水泥基復合材料連梁；三個重點主要包括以下內(nèi)容： 1分析了超高韌性水泥基復合材料的配合比及攪拌工藝,對超高韌性水泥基復合材料進行了基本力學性能的試驗。分別從超高韌性水泥基復合材料配制工藝、抗壓強度試驗和抗拉強度試驗三個方面進行闡述,了解了超高韌性水泥基復合材料的基本力學性能,通過實驗室配制澆筑不同類型的超高韌性水泥基復合材料試塊,得到了單軸抗拉、單軸抗壓的強度值及試件的應力應變曲線,為超高韌性水泥基復合材料構件的計算提供依據(jù),并對應力應變曲線進行分析,為進一步的理論分析和數(shù)值模擬提供參考。 2通過9根超高韌性水泥基復合材料簡支梁試驗和1根混凝土對比試件試驗,對集中荷載作用下的超高韌性水泥基復合材料梁的受剪性能進行了試驗研究,討論了不同配筋率、配箍率及剪跨比等主要因素對超高韌性水泥基復合材料梁剪切開裂強度和抗剪極限強度的影響；對梁在剪切破壞的變形特征和延性性能進行了分析；同時對超高韌性水泥基復合材料簡支梁和普通混凝土簡支梁的破壞特點及承載力進行了對比；最后對試件進行了基于修正壓力場理論的構件抗剪承載力理論計算。 3通過10根超高韌性水泥基復合材料連梁和1根對比混凝土連梁的試驗,詳細研究了連梁在低周反復加載和靜載作用下的破壞形態(tài)、抗剪承載力、荷載位移曲線、鋼筋應變、連梁的軸向變形和剪切變形等性能；結合本次試驗對超高韌性水泥基復合材料連梁的骨架曲線、位移延性、承載力退化及剛度退化和耗能性能進行了分析,同時對試件進行了抗剪承載力的分析,給出了計算建議公式；其次利用軟化拉壓桿模型對試件進行了抗剪承載力的理論計算,對超高韌性水泥基復合材料連梁的試驗值和理論值進行了對比和分析；最后對部分連梁試件進行了ANYSY有限元分析,得到了試件的承載力、鋼筋應變等性能,并與試驗值進行對比分析。 研究表明：超高韌性水泥基復合材料具有較好的強度和優(yōu)越的韌性性能,超高韌性水泥基復合材料構件具有較好承載力和延性性能,超高韌性水泥基復合材料能夠應用于實際工程中。
[Abstract]:Super high toughness cement-based composite material is a new type of building material made of cement as a basic binder, adding small size aggregate as a matrix, and adding a volume of about 2% of polyvinyl alcohol as a reinforced material. The characteristics of this material are different from the previous fiber reinforced material, depending on increasing the volume content. Fiber has high performance, but a new type of composite material based on material microstructure design. This material has obvious strain hardening characteristics under load. It can produce a number of fine cracks under direct tension, and the stable tensile strain can reach about 3%.
In order to study the mechanical properties of ultra-high toughness cementitious composites and the shear properties of components, this paper focuses on the study of "one material, two components, three key points" to obtain the basic physical and mechanical properties of ultra high toughness cementitious composites and the bearing capacity and deformation properties of the components. The two components are super high toughness cementitious composite beams and super high toughness cement-based composite beams; the three main points include the following:
1 the mixture ratio and mixing process of ultra-high toughness cementitious composites were analyzed, and the basic mechanical properties of ultra high toughness cementitious composites were tested. From three aspects of super high toughness cementitious composite material preparation process, compressive strength test and tensile strength test, the super high toughness cementitious composite was understood. The basic mechanical properties of the material are prepared by the preparation of different types of ultra-high toughness cementitious composite material by the laboratory preparation. The strength value of uniaxial tensile, uniaxial compression and stress strain curve of the specimen are obtained, which provide the basis for the calculation of the super high toughness cementitious composite component, and analyze the stress-strain curve. The theoretical analysis and numerical simulation of the step are provided for reference.
2 the shear behavior of ultra high toughness cementitious composite beams under concentrated load was tested by 9 super high toughness cementitious composite simple supported beam test and 1 concrete contrast test. The main factors such as different reinforcement ratio, stirrup rate and shear span ratio were discussed, and the super high toughness cementitious composite material Liang Jian was discussed. The influence of shear strength and shear strength, the deformation characteristics and ductility of the beam in shear failure are analyzed, and the failure characteristics and bearing capacity of the simple supported beam of super high toughness cementitious composite and the simple concrete beam are compared. Finally, the specimen is constructed based on the correction pressure field theory. Theoretical calculation of shear bearing capacity.
3 through the experiments of 10 super high toughness cementitious composite beams and 1 concrete continuous beams, the failure modes, shear bearing capacity, load displacement curves, steel strain, axial deformation and shear deformation of continuous beams were studied in detail. The skeleton curves, displacement ductility, load-bearing degeneracy, stiffness degradation and energy dissipation of the composite beams are analyzed. At the same time, the shear bearing capacity of the specimens is analyzed, and the calculation formula is given. Secondly, the theoretical calculation of the shear bearing capacity of the specimens is carried out by using the softened tension and tension bar model, and the super high toughness cement base is made. The test values and theoretical values of composite beams are compared and analyzed. Finally, the finite element analysis of some specimens of continuous beams is carried out by ANYSY finite element analysis. The bearing capacity of the specimen, the strain and other properties of the steel bar are obtained and compared with the test values.
The research shows that ultra high toughness cementitious composites have better strength and superior ductility, and the ultrahigh toughness cementitious composites have better bearing capacity and ductility, and ultra high toughness cementitious composites can be applied to practical engineering.

【學位授予單位】：合肥工業(yè)大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU528

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