【摘要】：鋼筋混凝土結(jié)構(gòu)的耐久性損傷對結(jié)構(gòu)的抗震性能有顯著影響。目前國內(nèi)外對損傷鋼筋混凝土構(gòu)件抗震性能的研究一般僅考慮限于耐久性損傷或者地震單因素作用的影響,考慮多種耐久性損傷對結(jié)構(gòu)抗震性能的影響的研究還不系統(tǒng)。本文依托國家自然科學(xué)基金項目“鋼筋混凝土結(jié)構(gòu)抗震耐久性研究”(51178470),利用ABAQUS有限元軟件分析損傷鋼筋混凝土受彎構(gòu)件在低周反復(fù)荷載作用下的非線性全過程行為,籍此研究不同耐久性損傷對鋼筋混凝土受彎構(gòu)件抗震性能的影響。論文主要工作如下： 1)通過分析歸納各種鋼筋與混凝土本構(gòu)模型,建立了考慮材料性能劣化的鋼筋與混凝土本構(gòu)關(guān)系模型。 2)依據(jù)考慮材料性能劣化的鋼筋與混凝土本構(gòu)模型,利用ABAQUS軟件建立受彎構(gòu)件有限單元模型,選取合理的有限元單元模型、網(wǎng)格劃分和迭代運算方法。經(jīng)與單調(diào)加載和低周反復(fù)加載的模型試驗結(jié)果對比,驗證了本構(gòu)模型和分析方法的穩(wěn)定性和準確性。 3)采用建立的ABAQUS有限元模型分析了鋼筋混凝土受彎構(gòu)件不同損傷參數(shù),如：縱筋銹蝕率、混凝土碳化深度變化對受彎構(gòu)件在低周反復(fù)荷載作用下的響應(yīng)的影響。分析結(jié)果表明,縱筋銹蝕率的增加將使構(gòu)件承載力、延性、耗能能力顯著下降；碳化深度對構(gòu)件承載能力作用不明顯,但構(gòu)件延性和耗能能力有所下降。 4)通過對不同鋼筋銹蝕率和混凝土碳化深度的受彎構(gòu)件滯回性能的綜合分析比較,建立了損傷鋼筋混凝土受彎構(gòu)件的恢復(fù)力模型骨架曲線,模型較好地反映了鋼筋銹蝕率變化對恢復(fù)力模型骨架曲線特征參數(shù)的影響。
[Abstract]:The durability damage of reinforced concrete structure has a significant effect on the seismic performance of the structure. At present, the research on seismic behavior of damaged reinforced concrete members at home and abroad is generally limited to durability damage or the effect of earthquake single factor, and the study on the effect of various durability damage on seismic performance of structures is not systematic. In this paper, based on the project of National Natural Science Foundation "Research on Seismic durability of reinforced concrete structures" (51178470), the nonlinear whole process behavior of damaged reinforced concrete flexural members under low cyclic loading is analyzed by ABAQUS finite element software. The effect of different durability damage on seismic behavior of reinforced concrete flexural members is studied. The main work of this paper is as follows: 1) through the analysis and induction of various constitutive models of steel bar and concrete, Based on the constitutive model of steel bar and concrete considering the deterioration of material performance, the finite element model of flexural member is established by using ABAQUS software. The reasonable finite element model, mesh division and iterative method are selected. Compared with the model test results of monotone loading and low cycle repeated loading, The stability and accuracy of the constitutive model and the analytical method are verified. 3) different damage parameters of reinforced concrete flexural members are analyzed by using the established ABAQUS finite element model, such as the corrosion rate of longitudinal bars. The influence of the change of concrete carbonization depth on the response of flexural members under low cyclic loading. The results show that the increase of corrosion rate of longitudinal reinforcement will significantly decrease the bearing capacity, ductility and energy dissipation capacity of the members, while the carbonation depth has no obvious effect on the bearing capacity of the members. However, the ductility and energy dissipation capacity of the members are decreased. 4) the hysteretic behavior of flexural members with different corrosion rates and carbonation depth of concrete is analyzed and compared. The restoring force model skeleton curve of damaged reinforced concrete flexural member is established. The model reflects the influence of corrosion rate change on the characteristic parameters of restoring force model skeleton curve.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375

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