低周反复荷载作用下损伤钢筋混凝土受弯构件全过程分析
发布时间：2018-08-25 15:31
【摘要】：钢筋混凝土结构的耐久性损伤对结构的抗震性能有显著影响。目前国内外对损伤钢筋混凝土构件抗震性能的研究一般仅考虑限于耐久性损伤或者地震单因素作用的影响,考虑多种耐久性损伤对结构抗震性能的影响的研究还不系统。本文依托国家自然科学基金项目“钢筋混凝土结构抗震耐久性研究”(51178470),利用ABAQUS有限元软件分析损伤钢筋混凝土受弯构件在低周反复荷载作用下的非线性全过程行为,籍此研究不同耐久性损伤对钢筋混凝土受弯构件抗震性能的影响。论文主要工作如下： 1)通过分析归纳各种钢筋与混凝土本构模型,建立了考虑材料性能劣化的钢筋与混凝土本构关系模型。 2)依据考虑材料性能劣化的钢筋与混凝土本构模型,利用ABAQUS软件建立受弯构件有限单元模型,选取合理的有限元单元模型、网格划分和迭代运算方法。经与单调加载和低周反复加载的模型试验结果对比,验证了本构模型和分析方法的稳定性和准确性。 3)采用建立的ABAQUS有限元模型分析了钢筋混凝土受弯构件不同损伤参数,如：纵筋锈蚀率、混凝土碳化深度变化对受弯构件在低周反复荷载作用下的响应的影响。分析结果表明,纵筋锈蚀率的增加将使构件承载力、延性、耗能能力显著下降；碳化深度对构件承载能力作用不明显,但构件延性和耗能能力有所下降。 4)通过对不同钢筋锈蚀率和混凝土碳化深度的受弯构件滞回性能的综合分析比较,建立了损伤钢筋混凝土受弯构件的恢复力模型骨架曲线,模型较好地反映了钢筋锈蚀率变化对恢复力模型骨架曲线特征参数的影响。
[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.
【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】：TU375
本文编号：2203334
[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.
【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】：TU375
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