低掺量橡胶混凝土单轴受压本构关系改进研究

发布时间：2018-05-18 21:01

本文选题：低掺量橡胶混凝土 + 本构关系模型　；参考：《广东工业大学》2013年硕士论文

【摘要】：我国“十二五”规划的绿色发展主题要求建筑业大力发展符合绿色建筑要求的新型建材及制品。我国《绿色建筑评价标准》(GB/T503782006)对“绿色建筑”要求保护环境和减少污染,最大可能使用可再生材料,循环利用建筑材料。废旧轮胎造成了严重的“黑色污染”,橡胶混凝土在解决废旧轮胎带来的环境破坏和资源浪费问题方面,完全符合当今绿色建筑发展要求。目前主要把橡胶混凝土用作建筑功能材料,研究高掺量的橡胶混凝土。而作为结构材料的橡胶混凝土则是低掺量,为了推广橡胶混凝土在结构工程中的应用,低掺量橡胶混凝土的本构关系研究是非常重要的。目前橡胶混凝土的本构关系研究虽然已有初步的成果,但由于试验条件限制还有待完善。本文在对低掺量橡胶混凝土单轴受压力学性能试验的机理分析研究基础上,对橡胶混凝土单轴受压本构模型进行了改进,并对建立的本构模型进行了分析和实验验证论文采用5种橡胶掺量、5种橡胶粒径组合的低掺量橡胶混凝土进行单轴受压试验,研究分析橡胶的掺量、粒径和掺入方式对低掺量橡胶混凝土的轴心抗压强度、弹性模量、峰值应变、极限应变、可见裂缝的出现以及试件破坏形态等力学性能指标的影响,试验结果表明这些力学性能指标与橡胶的掺量、粒径和掺入方式有密切的关系,论文对这些关系给出了相应的机理分析。本文采用经验本构模型的研究方法,利用最小二乘法曲线拟合以及多元非线性回归的数学方法,根据试验测得的单轴受压应力-应变全曲线建立起包括轴心抗压强度、峰值应变以及本构参数a、b的数学表达式的低掺量橡胶混凝土单轴受压本构模型,本构参数a、b与橡胶掺量、粒径有明显规律关系,并且参数a、b具有明确物理意义。最后把建立的本构模型运用到检验组试验和前人试验研究中,结果表明本构模型具有较好预测能力和较高准确度,在通用性和预测性能上得到进一步改善提高。
[Abstract]:The green development theme of the 12th Five-Year Plan requires the construction industry to develop new building materials and products that meet the requirements of green construction. GB / T503782006) requires "green building" to protect the environment and reduce pollution, use renewable materials and recycle construction materials as far as possible. Waste tires cause serious "black pollution". Rubber concrete can solve the problems of environmental damage and waste of resources caused by waste tires, which fully meet the requirements of green building development. At present, rubber concrete is mainly used as building functional material to study rubber concrete with high content. Rubber concrete, as a structural material, is of low content. In order to popularize the application of rubber concrete in structural engineering, it is very important to study the constitutive relation of rubber concrete with low content. Although the constitutive relation of rubber concrete has been studied preliminarily, it still needs to be improved due to the limitation of test conditions. In this paper, based on the analysis and study of the mechanism of uniaxial compressive mechanical properties test of low content rubber concrete, the uniaxial compression constitutive model of rubber concrete is improved, and the established constitutive model is analyzed and verified by experiments. In this paper, the uniaxial compression test of low content rubber concrete with five kinds of rubber content and five kinds of rubber particle size combination is carried out, and the axial compressive strength and elastic modulus of low content rubber concrete are studied and analyzed. The effects of peak strain, limit strain, crack appearance and fracture morphology on the mechanical properties of rubber are studied. The test results show that these mechanical properties are closely related to the amount of rubber, particle size and mixing mode. The mechanism of these relationships is analyzed in this paper. In this paper, the empirical constitutive model is used, the least square curve fitting and the mathematical method of multivariate nonlinear regression are used to establish the axial compressive strength including axial compressive strength according to the stress-strain full curve of uniaxial compression measured by experiment. The constitutive model of low content rubber concrete under uniaxial compression for peak strain and constitutive parameter ab has obvious relationship with rubber content and particle size, and the parameter ab is of clear physical significance. Finally, the established constitutive model is applied to the test group test and previous experiments. The results show that the constitutive model has better prediction ability and higher accuracy, and the generality and prediction performance are further improved.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.41

【参考文献】