本文關(guān)鍵詞：混凝土單軸受壓細觀統(tǒng)計損傷本構(gòu)模型研究　出處：《西安建筑科技大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混凝土 細觀損傷 平行桿模型 Weibull分布 本構(gòu)模型 凍融作用 數(shù)值模擬

【摘要】：混凝土結(jié)構(gòu)是世界上應(yīng)用非常廣泛的結(jié)構(gòu)形式，它的力學(xué)性能和本構(gòu)關(guān)系一直是結(jié)構(gòu)工程界的研究重點。然而混凝土材料具有非常復(fù)雜且不確定的特性，迄今為止還未有廣泛適用的混凝土本構(gòu)模型。本文分析混凝土損傷機理，結(jié)合混凝土破壞過程，對混凝土細觀統(tǒng)計損傷本構(gòu)模型進行了理論探索。 通過比較細觀統(tǒng)計損傷力學(xué)和宏觀連續(xù)損傷力學(xué)的基本理論及其損傷模型的優(yōu)缺點，指出基于唯象的細觀統(tǒng)計損傷本構(gòu)模型是混凝土本構(gòu)研究的新方向。根據(jù)非線性科學(xué)中的協(xié)同學(xué)和突變論等有關(guān)理論，將混凝土損傷破壞過程分為均勻損傷階段、臨界狀態(tài)和局部破壞階段，并將臨界狀態(tài)作為本構(gòu)模型的最終破壞點。 通過對混凝土破壞機理的分析，根據(jù)彈脆性平行桿模型的原理思想和Weibull概率密度函數(shù)與混凝土強度概率分布函數(shù)相似的特點，建立了混凝土單軸受壓細觀統(tǒng)計損傷本構(gòu)模型。通過兩組經(jīng)凍融循環(huán)作用的混凝土單軸受壓試驗，確定了本構(gòu)模型參數(shù)，對理論結(jié)果和試驗結(jié)果進行分析，驗證其合理性。 有限元分析是進行大型結(jié)構(gòu)設(shè)計的有效方法，但要使混凝土結(jié)構(gòu)有限元分析結(jié)果具有較高的精度，則所選用的本構(gòu)模型必須準(zhǔn)確地描述材料的本構(gòu)行為。運用ABAQUS有限元分析軟件，模擬混凝土棱柱體試件單軸受壓的力學(xué)性能，將采用本文本構(gòu)模型的模擬結(jié)果分別與試驗結(jié)果和采用《混凝土規(guī)范》推薦的本構(gòu)模型的模擬結(jié)果進行對比，所得結(jié)果相似度較高，表明本文本構(gòu)模型在ABAQUS模擬中可取得較好的結(jié)果，，能較準(zhǔn)確地模擬混凝土本構(gòu)行為。
[Abstract]:Concrete structures are widely used in the world, its mechanical properties and constitutive relations have been the focus of research in the field of structural engineering. However, concrete materials have very complex and uncertain characteristics. Up to now, there is no widely applicable concrete constitutive model. In this paper, the damage mechanism of concrete is analyzed, and the meso-statistical damage constitutive model of concrete is theoretically explored in combination with the concrete failure process. By comparing the basic theory of meso-statistical damage mechanics and macroscopic continuous damage mechanics and the advantages and disadvantages of the damage model. It is pointed out that the meso-statistical damage constitutive model based on phenomenology is a new direction of concrete constitutive research. The damage and failure process of concrete is divided into uniform damage stage, critical state and local failure stage, and the critical state is regarded as the ultimate failure point of constitutive model. By analyzing the failure mechanism of concrete, according to the principle of elastic-brittle parallel bar model and the characteristics of Weibull probability density function and concrete strength probability distribution function. A statistical damage constitutive model of concrete under uniaxial compression is established. The parameters of the constitutive model are determined by two groups of uniaxial compression tests of concrete subjected to freeze-thaw cycle. The theoretical and experimental results are analyzed. Verify its rationality. Finite element analysis is an effective method for large-scale structural design, but the result of finite element analysis of concrete structure should have high accuracy. The constitutive model must accurately describe the constitutive behavior of the material. The mechanical properties of concrete prism specimen under uniaxial compression are simulated by ABAQUS finite element analysis software. The simulation results of the constitutive model in this paper are compared with the experimental results and the simulation results of the constitutive model recommended by the concrete Code, and the results have high similarity. It is shown that the constitutive model in this paper can obtain good results in ABAQUS simulation and can simulate the constitutive behavior of concrete more accurately.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU37

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