圆钢管再生混凝土柱力学性能研究

发布时间：2018-06-23 23:12

本文选题：圆钢管再生混凝土 + 再生骨料取代率　；参考：《中南大学》2014年硕士论文

【摘要】：本文开展圆钢管再生混凝土轴压短柱和压弯构件受力性能的理论分析,主要研究内容如下： (1)提出单轴拉压应力-应变关系和轴对称三轴受压应力-应变关系。根据已有试验结果,对不同取代率下再生混凝土的单轴力学性能进行统一分析,在借鉴普通混凝土力学模型的基础上,提出适用于各种取代率的再生混凝土力学性能指标的统一表达式和单轴应力-应变全曲线的计算方法；在普通混凝土轴对称三轴受压应力-应变关系的基础上,提出了再生混凝土轴对称三轴受压应力-应变关系。 (2)建立圆钢管再生混凝土轴压短柱弹塑性全过程分析理论,揭示圆钢管再生混凝土轴压短柱受力性能,建立圆钢管再生混凝土轴压短柱的承载力实用计算公式,并在计算的基础上提出钢管再生混凝土轴压短柱与普通钢管混凝土的承载力折减关系式。基于连续介质力学,利用再生混凝土轴对称三轴受压应力-应变关系,采用圆钢管再生混凝土同心圆柱体力学模型,建立圆钢管再生混凝土短柱弹塑性法,编制Fortran计算程序；利用弹塑性法和有限元软件ABAQUS对轴压短柱进行数值分析,在弹塑性法、有限元法与试验结果相互验证的基础上,利用弹塑性法探讨各参数对圆钢管再生混凝土轴压短柱受力性能的影响,提出短柱轴压组合应力-应变关系实用计算方法。 (3)在平截面假设和钢管再生混凝土拉压本构关系的基础上建立模型柱法,对压弯构件进行全过程分析,提出钢管再生混凝土与普通钢管混凝土偏压柱的承载力折减关系式。基于圆钢管再生混凝土弹塑全过程分析,确立拉压数值本构关系,采用平截面假设,用模型柱法和ABAQUS有限元软件对圆钢管再生混凝土压弯构件进行全过程分析,在模型柱法、有限元法与试验结果相互验证的基础上,利用模型柱法,探讨各参数影响下再生骨料取代率对圆钢管再生混凝土压弯构件受力性能的影响。
[Abstract]:The main contents of this paper are as follows: (1) the uniaxial stress-strain relationship and axisymmetric triaxial stress-strain relationship are proposed. According to the experimental results, uniaxial mechanical properties of recycled concrete under different substitution rates are analyzed in a unified way, and the mechanical model of ordinary concrete is used for reference. A unified expression for mechanical properties of recycled concrete with various substitution rates and a calculation method for uniaxial stress-strain complete curve are presented, based on the stress-strain relationship of axisymmetric triaxial compression of ordinary concrete, The stress-strain relationship of recycled concrete under axisymmetric triaxial compression is proposed. (2) the elastic-plastic whole process analysis theory of recycled concrete filled circular steel tube column under axial compression is established, and the mechanical behavior of recycled concrete filled circular steel tube column under axial compression is revealed. A practical formula for calculating the bearing capacity of recycled concrete filled steel tubular columns under axial compression is established. Based on the calculation, the relationship between the bearing capacity of recycled concrete filled steel tubular columns and ordinary concrete filled steel tubes is put forward. Based on continuum mechanics and the stress-strain relationship of recycled concrete under axisymmetric triaxial compression, a circular steel tube regenerated concrete concentric cylinder mechanical model is adopted to establish the elastic-plastic method for recycled concrete filled circular steel tube short columns, and a Fortran calculation program is developed. The elastic-plastic method and finite element software Abaqus are used for the numerical analysis of axial compression short columns. The results of elastic-plastic method, finite element method and test are verified. The effects of various parameters on the mechanical behavior of recycled concrete filled circular steel tube columns under axial compression are investigated by using the elastoplastic method. A practical method for calculating the stress-strain relationship of short columns under axial compression is put forward. (3) based on the assumption of plane section and the constitutive relationship between tension and compression of recycled concrete filled steel tube, a model column method is established to analyze the whole process of compression and bending members. A formula for reducing bearing capacity of recycled concrete filled steel tubular columns and ordinary concrete filled steel tubular columns is presented. Based on the elastic-plastic whole process analysis of recycled concrete filled circular steel tube, the tension-compression numerical constitutive relation is established. The model column method and Abaqus finite element software are used to analyze the whole process of recycled concrete filled circular steel tube members under compression and bending, and the model column method is used. On the basis of mutual verification between finite element method and test results, model column method is used to study the effect of recycled aggregate replacement ratio on the mechanical behavior of recycled concrete filled circular steel tube members under compression and bending under the influence of various parameters.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

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