矩形钢管再生混合混凝土本构关系的试验研究及其应用

发布时间：2018-05-08 18:27

本文选题：矩形钢管 + 再生混合混凝土　；参考：《华侨大学》2017年硕士论文

【摘要】：随着我国基础设施的不断完善,人民居住环境的改善,不可避免的产生大量建筑垃圾。如果在建筑中应用再生混凝土,将能够有效的消耗建筑垃圾,保护环境。现如今钢管再生混合混凝土结构研究中,对于矩形钢管再生混合混凝土结构的本构关系模型还不够深入。因此,本文在总结之前的成果的基础上,对矩形钢管再生混合混凝土的本构关系进行试验研究。目前,对矩形钢管再生混合混凝土的本构关系的研究中,基本通过采取方钢管混凝土的应力-应变关系模型进行一定的参数修正,并未考虑到截面高宽比对其的影响。为此,本文以截面高宽比为主要控制参数,同时考虑含钢率、混合比、钢材强度和混凝土强度等因素的影响,设计24个矩形钢管再生混合混凝土短柱试件。通过轴压短柱试验研究其本构关系,根据结果可知:(1)矩形截面的高宽比对矩形钢管再生混合混凝土的力学性能有一定的影响,截面的高宽比的不断增加,承载力的提高系数和延性系数逐渐减小,研究其本构关系时,应考虑截面高宽比的影响;(2)随着钢材强度和混凝土强度的增加,矩形钢管再生混合混凝土短柱的轴压承载能力有增大的趋势,混合比对承载力影响有限;(3)矩形钢管再生混合混凝土短柱的变形性能良好,钢材强度、含钢率的增加以及混凝土强度、混合比的减小,试件的延性有不断增大的趋势。在对照现有的关于钢材和其核心混凝土的本构关系模型,结合试验数据进行回归分析,引入截面高宽比的影响因素,提出适用于矩形钢管再生混合混凝土的本构关系。依据所确定的材料本构关系,利用有限单元法对轴压短柱试件进行数值分析,与试验结果和已有的本构关系模型进行对比。结果表明:引入截面高宽比影响的本构关系的有限元分析结果与试验实测数据比较,两者差异很小,验证所提出的本构关系的合理性。比较规程ACI 318-05-2005、AIJ-2008、BS5400-2005、CECS159:2004、DBJ13-51-2003、EC4-2004、GB50936-2014对矩形钢管再生混凝土轴压承载力计算式的差异,建议采用规程DBJ计算矩形钢管再生混凝土轴压短柱的极限承载力。同时在本课题已有研究的基础上,根据试验结果确定可用于矩形钢管再生混合混凝土的轴压承载力计算修正公式。
[Abstract]:With the continuous improvement of infrastructure and the improvement of people's living environment, a large number of construction waste will inevitably be produced. If recycled concrete is applied in buildings, it can consume construction waste effectively and protect environment. In the research of recycled concrete filled steel tube (CFST) structure, the constitutive relation model of recycled concrete filled rectangular steel tube (RC) structure is not deep enough. Therefore, on the basis of summarizing the previous results, the constitutive relationship of recycled concrete in rectangular steel tubes is studied experimentally. At present, in the study of constitutive relationship of recycled concrete filled rectangular steel tubes, the stress-strain relationship model of concrete-filled square steel tube is adopted to modify some parameters, and the effect of aspect ratio of section on it is not taken into account. Therefore, taking the aspect ratio of section as the main control parameter and considering the influence of steel content, mixing ratio, steel strength and concrete strength, 24 rectangular steel tube recycled concrete short column specimens are designed in this paper. According to the experimental results, the ratio of height to width of rectangular section has a certain influence on the mechanical properties of recycled mixed concrete of rectangular steel tube, and the ratio of height to width of section is increasing. The increasing coefficient and ductility coefficient of bearing capacity decrease gradually. When studying the constitutive relation, the influence of aspect ratio of section should be considered. (2) with the increase of steel strength and concrete strength, The axial load bearing capacity of recycled concrete filled rectangular steel tubular columns has an increasing tendency, and the mixing ratio has a limited effect on the bearing capacity. (3) the deformation performance of the recycled concrete short columns of rectangular steel tubes is good, and the strength of steel is obtained. The ductility of the specimens increases with the increase of steel content and the decrease of concrete strength and mixing ratio. According to the existing constitutive relation model of steel and its core concrete and the regression analysis of test data, the constitutive relation suitable for recycled mixed concrete of rectangular steel tube is put forward by introducing the influence factors of aspect ratio of section. According to the material constitutive relation, the finite element method is used to analyze the specimen of short column under axial compression, and the results are compared with the experimental results and the existing constitutive model. The results show that the difference between the results of finite element analysis and the experimental data is very small, which verifies the reasonableness of the proposed constitutive relation. The difference of calculation formula for axial compressive capacity of recycled concrete filled rectangular steel tube (GB50936-2014) in ACI 318-05-2005 / AIJ-2008 / BS5400-2005 / CECS159 / 2004 / DBJ13-51-200333-2014 is proposed. It is suggested that DBJ should be used to calculate the ultimate bearing capacity of recycled concrete filled rectangular steel tube columns under axial compression. At the same time, on the basis of the previous research in this paper, the modified formula of axial compression bearing capacity of recycled concrete filled rectangular steel tube is determined according to the experimental results.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

【参考文献】