FRP筋混凝土深梁的抗剪性能分析

发布时间：2021-11-13 08:36

　　近年来,有限元分析（FEM）在结构研究与设计的应用前景日益凸显。因此,利用有限元分析研究全尺寸深梁的力学性能,可以免于大型试验冗杂的准备工作和高昂的试验费用,是较好的研究途径。本文围绕FRP增强混凝土深梁的抗剪性能展开了一系列研究工作。研究分三个阶段进行:数值模拟,参数分析和统计分析。使用有限元分析软件（ABAQUS）进行了数值模拟,考察不同参数对构件抗剪性能的影响,例如剪切跨度与深度之比,配筋率和荷载板的尺寸。将数值模拟的计算值与所选文献的试验值进行了对比,包括极限承载力、相应的中跨挠度、破坏模式等;进行了拓展参数分析,以进一步研究FRP增强混凝土深梁的抗剪性能,并研究影响其极限承载力的关键参数,本文提出的有限元分析方法在评估不同参数对构件极限承载力的影响方面表现出良好的准确性。此外,从文献中收集了66个FRP增强混凝土深梁实验测试的数据库,以评估所提出的抗剪强度方程的有效性以及检查加拿大规范STM（CSA S80-12）。提出的方程式产生了相对安全的结果,而加拿大规定的STM（CSA S806-12）则低估了数据库中的结果,实验至预测值的平均值为1.87,COV为34.63%。这种... 

【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校

【文章页数】：85 页

【学位级别】：硕士

【文章目录】：
Abstract
摘要
Chapter 1 Introduction
    1.1 Background
        1.1.1 Strength and characteristics of deep beams
        1.1.2 Field problems of reinforced concrete deep beams
    1.2 FRP Const ituents:Fibers
        1.2.1 FRP Constituents:Resin
        1.2.2 FRP Constituents:Fillers and Additives
        1.2.3 Characteristics of FRP bars
        1.2.4 Advantages and Applications of FRP bars
        1.2.5 Limitations of FRP bars
    1.3 Literature review
    1.4 Object ive of the Thesis
    1.5 Structure of the Thesis
Chapter 2 Non-linear Finite Element Modeling
    2.1 Introduct ion
        2.1.1 Beam Parts and Section Assignments
    2.2 Constitut ive Models
    2.3 Concrete Model
        2.3.1 Uniaxial Compressive Behavior
        2.3.2 Uniaxial Tensile Behavior
        2.3.3 Compression and Tension damage parameters
        2.3.4 Concrete Poisson’s Ratio
    2.4 FRP reinforcement
    2.5 U-shaped steel st irrups
    2.6 Elements
        2.6.1 Solid Element for modeling Concrete and bearing plates
        2.6.2 Truss Element for modeling FRP bars
    2.7 Meshing
    2.8 Assembly,Boundary Condit ions and Loading
    2.9 Time Step Incrementat ion
        2.9.1 Mass Scaling in ABAQUS explicit
        2.9.2 Smooth amplitude curves
    2.10 Interact ion
        2.10.1 Interaction between FRP bars and Surrounding Concrete
        2.10.2 Interaction between Concrete and Bearing plates
    2.11 Summary of the proposed FEM
Chapter 3 Results and Discussion of the FEM
    3.1 Validation of the FEM
        3.1.1 Description of the test
    3.2 Comparison of Crack Pattern and Mode of Failure
    3.3 Comparison of load-midspan deflection response curves
    3.4 Parametric study
        3.4.1 Effect of FRP longitudinal reinforcement ratio(ρ)on the beam capacity
        3.4.2 Effect of concrete compressive strength fc on the beam capacity
        3.4.3 Effect of shear span-to-depth ratio(a/d)on the beam capacity
        3.4.4 Effect of loading-plate size(lt)on the beam capacity
    3.5 Modified Shear strength equat ion
    3.6 Chapter Summary
Chapter 4 Shear strength of FRP-RC deep beams
    4.1 Introduct ion
    4.2 Shear mechanism
        4.2.1 Failure mechanism of FRP-RC deep beams
    4.3 Strut and Tie Method(STM)
        4.3.1 Modeling of FRP-RC deep beams using Strut and Tie Method(STM)
        4.3.2 Components of Strut and Tie Model
        4.3.3 Calculation procedure
    4.4 Jang et al.equat ions
    4.5 K.Mohamed et al.equat ion
    4.6 Comparat ive Analysis
    4.7 Chapter Summary
Conclusion and Recommendations
References
Appendix
Acknowledgements



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