活性粉末混凝土预制管混凝土组合柱轴心抗压性能研究
发布时间：2019-04-23 10:52
【摘要】：活性粉末混凝土(RPC)是一种超高性能混凝土,具有超高强度、优异的耐久性、良好的延性和耗能能力。活性粉末混凝土预制管混凝土组合柱(简称RPC管组合柱)是利用RPC的超高性能而提出的一种新型组合结构,由预制的RPC管和核心混凝土组成,能充分发挥RPC本身材料的超高抗压性能和约束混凝土的组合效应,具有轴向承载力高、抗火性能优异、耐久性好、材料成本低、施工方便及良好的生态效益等优点,是在超高性能混凝土与组合结构的交叉领域进行的创新性工作。本文进行了5组RPC管组合柱的轴心抗压试验,主要研究的参数是RPC管的厚度和箍筋间距,通过试验得出了RPC管组合柱的力—变形关系曲线,各种材料应变发展情况以及破坏形态。并将组合柱的承载力与按已有的约束混凝土柱模型计算的结果进行比较和分析,得到了RPC管组合柱的轴心受压基本性能,为下一步的研究奠定了基础。具体的研究内容如下:第一章:介绍了超高性能混凝土(UHPC)以及约束混凝土的研究概况,对活性粉末混凝土的推广和应用做了说明。基于RPC的优异性能和组合柱的基本结构形式,提出了一种新型组合柱—RPC管组合柱,并对其结构形式及特性进行了重点阐述。第二章:提出了组合柱进行轴心抗压试验的方案,对试件的设计和制作进行了详细说明,并进行了RPC的材料配比试验,最后加工了RPC预制管。第三章:对5组RPC管组合柱进行轴心抗压试验,得出各组试件的力—变形关系曲线和各种材料的应变,以及加载过程中的变形情况及破坏形态,对不同预制管壁厚和箍筋间距的RPC管组合柱进行受力分析。第四章:介绍几种约束混凝土模型理论,并选取Mander模型理论对试件的承载力进行近似计算,再和试验结果进行对比分析。考察此理论公式对这种新型组合柱的适用性,为进一步研究RPC管组合柱的基本性能提供理论参考。
[Abstract]:Reactive powder concrete (RPC) is an ultra-high performance concrete with super-high strength, excellent durability, good ductility and energy dissipation capacity. Reactive powder concrete precast pipe concrete composite column (referred to as RPC pipe composite column) is a new type of composite structure, which is composed of precast RPC pipe and core concrete, which makes use of the ultra-high performance of RPC. It has the advantages of high axial bearing capacity, excellent fire resistance, good durability, low material cost, convenient construction and good ecological benefit, which can give full play to the super high compressive performance of RPC material and the combined effect of confined concrete. It is an innovative work in the intersection of ultra-high performance concrete and composite structure. In this paper, the axial compression test of five groups of RPC pipe composite columns has been carried out. The main research parameters are the thickness of RPC pipe and the spacing of stirrups. The force-deformation relationship curve of RPC pipe composite column has been obtained through the test. Strain development and failure patterns of various materials. The bearing capacity of composite columns is compared with the results calculated according to the existing confined concrete column model, and the basic performance of axial compression of RPC pipe composite columns is obtained, which lays a foundation for the further research. The concrete research contents are as follows: in the first chapter, the research situation of ultra-high performance concrete (UHPC) and confined concrete is introduced, and the popularization and application of reactive powder concrete (RPC) are explained. Based on the excellent performance of RPC and the basic structure form of composite column, a new type of composite column-RPC pipe composite column is put forward, and its structure form and characteristics are described in detail. In the second chapter, the scheme of axial compression test for composite columns is put forward, the design and fabrication of the specimens are explained in detail, and the material proportion test of RPC is carried out. Finally, the RPC prefabricated pipe is fabricated. In the third chapter, the axial compression test of five groups of RPC tube composite columns is carried out, and the force-deformation relation curves and the strain of various materials are obtained, as well as the deformation and failure patterns in the loading process. The stress analysis of RPC pipe composite columns with different wall thickness and stirrups spacing was carried out. In chapter 4, several kinds of confined concrete model theory are introduced, and the Mander model theory is selected to calculate the bearing capacity of the specimen approximately, and then the test results are compared and analyzed. The applicability of the theoretical formula to this new type of composite column is investigated, which provides a theoretical reference for the further study of the basic behavior of RPC pipe composite column.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
[Abstract]:Reactive powder concrete (RPC) is an ultra-high performance concrete with super-high strength, excellent durability, good ductility and energy dissipation capacity. Reactive powder concrete precast pipe concrete composite column (referred to as RPC pipe composite column) is a new type of composite structure, which is composed of precast RPC pipe and core concrete, which makes use of the ultra-high performance of RPC. It has the advantages of high axial bearing capacity, excellent fire resistance, good durability, low material cost, convenient construction and good ecological benefit, which can give full play to the super high compressive performance of RPC material and the combined effect of confined concrete. It is an innovative work in the intersection of ultra-high performance concrete and composite structure. In this paper, the axial compression test of five groups of RPC pipe composite columns has been carried out. The main research parameters are the thickness of RPC pipe and the spacing of stirrups. The force-deformation relationship curve of RPC pipe composite column has been obtained through the test. Strain development and failure patterns of various materials. The bearing capacity of composite columns is compared with the results calculated according to the existing confined concrete column model, and the basic performance of axial compression of RPC pipe composite columns is obtained, which lays a foundation for the further research. The concrete research contents are as follows: in the first chapter, the research situation of ultra-high performance concrete (UHPC) and confined concrete is introduced, and the popularization and application of reactive powder concrete (RPC) are explained. Based on the excellent performance of RPC and the basic structure form of composite column, a new type of composite column-RPC pipe composite column is put forward, and its structure form and characteristics are described in detail. In the second chapter, the scheme of axial compression test for composite columns is put forward, the design and fabrication of the specimens are explained in detail, and the material proportion test of RPC is carried out. Finally, the RPC prefabricated pipe is fabricated. In the third chapter, the axial compression test of five groups of RPC tube composite columns is carried out, and the force-deformation relation curves and the strain of various materials are obtained, as well as the deformation and failure patterns in the loading process. The stress analysis of RPC pipe composite columns with different wall thickness and stirrups spacing was carried out. In chapter 4, several kinds of confined concrete model theory are introduced, and the Mander model theory is selected to calculate the bearing capacity of the specimen approximately, and then the test results are compared and analyzed. The applicability of the theoretical formula to this new type of composite column is investigated, which provides a theoretical reference for the further study of the basic behavior of RPC pipe composite column.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
【参考文献】
相关期刊论文 前10条
1 史庆轩;侯炜;张兴虎;姜维山;;箍筋约束混凝土结构及其发展展望[J];建筑结构学报;2009年S2期
2 郝文秀;阎贵平;钟铁毅;安明U，
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