本文選題：圓鋼管再生混凝土 + 再生骨料取代率��； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：本文開展圓鋼管再生混凝土軸壓短柱和壓彎構(gòu)件受力性能的理論分析,主要研究內(nèi)容如下： (1)提出單軸拉壓應(yīng)力-應(yīng)變關(guān)系和軸對(duì)稱三軸受壓應(yīng)力-應(yīng)變關(guān)系。根據(jù)已有試驗(yàn)結(jié)果,對(duì)不同取代率下再生混凝土的單軸力學(xué)性能進(jìn)行統(tǒng)一分析,在借鑒普通混凝土力學(xué)模型的基礎(chǔ)上,提出適用于各種取代率的再生混凝土力學(xué)性能指標(biāo)的統(tǒng)一表達(dá)式和單軸應(yīng)力-應(yīng)變?nèi)�的計(jì)算方法；在普通混凝土軸對(duì)稱三軸受壓應(yīng)力-應(yīng)變關(guān)系的基礎(chǔ)上,提出了再生混凝土軸對(duì)稱三軸受壓應(yīng)力-應(yīng)變關(guān)系。 (2)建立圓鋼管再生混凝土軸壓短柱彈塑性全過程分析理論,揭示圓鋼管再生混凝土軸壓短柱受力性能,建立圓鋼管再生混凝土軸壓短柱的承載力實(shí)用計(jì)算公式,并在計(jì)算的基礎(chǔ)上提出鋼管再生混凝土軸壓短柱與普通鋼管混凝土的承載力折減關(guān)系式。基于連續(xù)介質(zhì)力學(xué),利用再生混凝土軸對(duì)稱三軸受壓應(yīng)力-應(yīng)變關(guān)系,采用圓鋼管再生混凝土同心圓柱體力學(xué)模型,建立圓鋼管再生混凝土短柱彈塑性法,編制Fortran計(jì)算程序；利用彈塑性法和有限元軟件ABAQUS對(duì)軸壓短柱進(jìn)行數(shù)值分析,在彈塑性法、有限元法與試驗(yàn)結(jié)果相互驗(yàn)證的基礎(chǔ)上,利用彈塑性法探討各參數(shù)對(duì)圓鋼管再生混凝土軸壓短柱受力性能的影響,提出短柱軸壓組合應(yīng)力-應(yīng)變關(guān)系實(shí)用計(jì)算方法。 (3)在平截面假設(shè)和鋼管再生混凝土拉壓本構(gòu)關(guān)系的基礎(chǔ)上建立模型柱法,對(duì)壓彎構(gòu)件進(jìn)行全過程分析,提出鋼管再生混凝土與普通鋼管混凝土偏壓柱的承載力折減關(guān)系式�；趫A鋼管再生混凝土彈塑全過程分析,確立拉壓數(shù)值本構(gòu)關(guān)系,采用平截面假設(shè),用模型柱法和ABAQUS有限元軟件對(duì)圓鋼管再生混凝土壓彎構(gòu)件進(jìn)行全過程分析,在模型柱法、有限元法與試驗(yàn)結(jié)果相互驗(yàn)證的基礎(chǔ)上,利用模型柱法,探討各參數(shù)影響下再生骨料取代率對(duì)圓鋼管再生混凝土壓彎構(gòu)件受力性能的影響。
[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.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU398.9

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