本文選題：材料損傷模型 + 仿真模擬　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：基于理論研究的需求，本文將基于能量耗散機(jī)制，將研究重點(diǎn)放在用有限元軟件ABAQUS建立混凝土結(jié)構(gòu)疲勞性能的仿真分析應(yīng)用上，通過模擬結(jié)構(gòu)構(gòu)件荷載-撓度和荷載-切口張開位移關(guān)系，并將曲線與試驗(yàn)結(jié)果做對(duì)比，從而驗(yàn)證理論模型的有效性及實(shí)用性。另外，本論文也總結(jié)了混凝土構(gòu)件的疲勞性能理論研究在混凝土結(jié)構(gòu)的疲勞分析方面所取得的一系列進(jìn)展和疲勞損傷本構(gòu)模型的研究現(xiàn)狀；借鑒相關(guān)研究成果，，根據(jù)斷裂能密度和累積耗散能密度確定材料損傷因子，加卸載應(yīng)用非線性卸載－線性重加載路徑描述，從而建立對(duì)混凝土構(gòu)件單調(diào)受拉和往復(fù)受拉的疲勞損傷模型。 借助ABAQUS有限元軟件實(shí)現(xiàn)本文模型的有限元移植，從而使理論模型得以在實(shí)際工程中應(yīng)用。首先，混凝土疲勞損傷模型應(yīng)用Fortran語言編寫，成功實(shí)現(xiàn)模型中的屈服條件判斷、加載和卸載過程描述、非線性的迭代及應(yīng)力、應(yīng)變、雅可比矩陣等的一系列數(shù)值計(jì)算。同時(shí)，通過UMAT，將理論模型植入到有限元軟件ABAQUS中，建立混凝土構(gòu)件單軸單調(diào)和單軸疲勞損傷加載仿真分析平臺(tái)。 最后，應(yīng)用此仿真分析平臺(tái)，對(duì)混凝土簡(jiǎn)支梁在單軸單調(diào)和單軸循環(huán)加載情況下的力學(xué)性能進(jìn)行模擬。單軸循環(huán)加載模擬曲線能較好地體現(xiàn)往復(fù)加載過程中混凝土構(gòu)件的加載剛度退化、卸載殘余變形及滯回耗能等行為。本論文模型能很好地模擬混凝土單軸單調(diào)、單軸受拉低周循環(huán)加載下結(jié)構(gòu)的真實(shí)響應(yīng)，從而使理論模型的有限元移植的合理性得以充分證明，為本理論模型應(yīng)用于混凝土構(gòu)件的疲勞損傷分析提供了良好的仿真分析平臺(tái)。
[Abstract]:Based on the demand of theoretical research, this paper will focus on the application of finite element software ABAQUS to the simulation analysis of fatigue performance of concrete structures based on the energy dissipation mechanism.The relationship between load-deflection and load-notch opening displacement of structural members is simulated, and the curve is compared with the experimental results to verify the validity and practicability of the theoretical model.In addition, this paper also summarizes a series of progress in fatigue analysis of concrete structures and the current research status of fatigue damage constitutive models.According to the fracture energy density and cumulative dissipative energy density, the material damage factors are determined. The nonlinear unloading linear reloading path is used to describe the fatigue damage model of concrete members under monotonic and reciprocating tension.The finite element transplantation of the model is realized with the help of ABAQUS finite element software, so that the theoretical model can be applied in practical engineering.Firstly, the fatigue damage model of concrete is compiled with Fortran language, and a series of numerical calculations of yield condition, loading and unloading process, nonlinear iteration and stress, strain and Jacobian matrix are successfully realized.At the same time, the theoretical model is implanted into the finite element software ABAQUS, and the simulation analysis platform of uniaxial monotone and uniaxial fatigue damage of concrete members is established.Finally, the mechanical properties of simply supported concrete beams under uniaxial monotonic and uniaxial cyclic loading are simulated by using this simulation platform.The simulation curve of uniaxial cyclic loading can well reflect the behavior of load stiffness degradation, unloading residual deformation and hysteretic energy dissipation of concrete members during reciprocating loading.The model can well simulate the real response of concrete under uniaxial monotonic and uniaxial cyclic loading, thus the rationality of the finite element transplantation of the theoretical model can be fully proved.This model provides a good simulation platform for fatigue damage analysis of concrete members.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU37

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