在工程應(yīng)用中需要了解負(fù)載狀態(tài)下結(jié)構(gòu)的行為。有助于優(yōu)化設(shè)計(jì)并預(yù)防服役和運(yùn)行期間可能出現(xiàn)的異常,退化和局部損傷。局部損傷是一個(gè)嚴(yán)重的問(wèn)題,可能導(dǎo)致結(jié)構(gòu)災(zāi)難性的故障和運(yùn)行事故。因此,結(jié)構(gòu)健康監(jiān)測(cè)（SHM）近年來(lái)受到了相當(dāng)大的關(guān)注。然而,由于土木工程結(jié)構(gòu)的多相性和不均勻性,傳統(tǒng)的檢測(cè)方法（如視覺(jué)檢測(cè),渦流和超聲波技術(shù)）非常繁瑣,昂貴,甚至不可靠。像壓電陶瓷這種智能材料具有主動(dòng)傳感,低成本,快速響應(yīng),不同形狀的可用性以及實(shí)施簡(jiǎn)單等優(yōu)點(diǎn),近年來(lái),作為一種新的工具使得結(jié)構(gòu)健康監(jiān)測(cè)（SHM）得到了發(fā)展。本研究集中在基于壓電（PZT）片的壓電阻抗（EMI）法。EMI法運(yùn)用于損傷檢測(cè)具有高頻驅(qū)動(dòng)特征和非模型基礎(chǔ)的優(yōu)點(diǎn),因此它可以檢測(cè)到結(jié)構(gòu)損傷的發(fā)生并且對(duì)小的局部損傷敏感。考慮到這一點(diǎn),本研究的目的是開(kāi)發(fā)一種基于壓電阻抗的新技術(shù)來(lái)檢測(cè)兩個(gè)對(duì)稱點(diǎn)加載的鋼-混凝土組合梁的局部損傷。因此,提出一種新的思路即將PZT片粘貼在鋼-混凝土組合梁中的剪力釘上,根據(jù)PZT導(dǎo)納的實(shí)部,分析損傷距離s和/或損傷深度d對(duì)PZT片的影響。尤其是采用ANSYS軟件對(duì)荷載作用下的鋼-混凝土組合梁進(jìn)行數(shù)值模擬,以了解其基本行為并評(píng)估損傷... 

【文章來(lái)源】：天津大學(xué)天津市 211工程院校 985工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：104 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
ABSTRACT
CHAPTER 1 INTRODUCTION
    1.1 Motivation and Background
    1.2 Objectives and Scope
    1.3 Organization of thesis
CHAPTER 2 LITERATURE REVIEW
    2.1 Introduction
    2.2 Structural Health Monitoring （SHM） of civil infrastructures
    2.3 Conventional techniques of Structural Health Monitoring （SHM）
        2.3.1 Vibration-based SHM techniques
        2.3.2 Static response-based techniques
        2.3.3 Dynamic response-based techniques
        2.3.4 Local SHM techniques
    2.4 Techniques using smart systems/structures concepts for SHM
        2.4.1 Smart structure
        2.4.2 Smart materials
        2.4.3 Components of Smart System
        2.4.4 Potential applications of smart systems in civil engineering
    2.5 Structural Health Monitoring （SHM） with Piezoelectricity and Piezoelectric materials
        2.5.1 History of piezoelectricity
        2.5.2 Constitutive piezoelectric relations
            2.5.2.1 Piezoelectric directions and coefficients
            2.5.2.2 Basic piezoelectric equations
        2.5.3 Type of piezoelectric materials
            2.5.3.1 Piezoceramics
            2.5.3.2 Piezopolymers
    2.6 Damages detection methods based on piezoelectric material
        2.6.1 Development of Lamb wave propagation method
        2.6.2 Development of Electromechanical Impedance （EMI） method
CHAPTER 3 ELECTROMECHANICAL IMPEDANCE （EMI） METHOD
    3.1 Introduction
    3.2 Principle and formula derivation
    3.3 PZT-Structure Interaction
    3.4 Parameters of the Electromechanical Impedance Method
        3.4.1 Frequency Ranges
        3.4.2 Sensing Region
        3.4.3 Damage Assessment
    3.5 Electromechanical Admittance measurement
        3.5.1 Measurement using impedance analyzer
        3.5.2 Calculation using ANSYS software
    3.6 Advantages of EMI Technique
    3.7 Limitations of EMI Technique
CHAPTER 4 NUMERICAL SIMULATION
    4.1 Introduction
    4.2 Typical description and detail models of steel-concrete composite beam
        4.2.1 Steel beam
        4.2.2 Concrete slab
            4.2.2.1 Effective cross section
            4.2.2.2 Depth of concrete slab hc
        4.2.3 Shear studs
            4.2.3.1 Shear force to be transferred by connectors
            4.2.3.2 Resistance of studs PRk
            4.2.3.3 Number of shear stud connectors
            4.2.3.4 Spacing of shear studs in the beam section
            4.2.3.5 Spacing of end studs
    4.3 Finite Element analysis
        4.3.1 General modeling of steel-concrete composite beam
            4.3.1.1 Element type
            4.3.1.2 Real constants
            4.3.1.3 Element Properties
            4.3.1.4 Modeling of the beam
            4.3.1.5 Meshing of beam
            4.3.1.6 Shear key modeling
            4.3.1.7 Loads and boundary condition
        4.3.2 Static analysis of the steel-concrete composite beam
    4.4 Harmonic analysis
        4.4.1 Calculation procedures
        4.4.2 FE model of steel-concrete composite beam
        4.4.3 FE model of PZT patch
CHAPTER 5 RESULTS AND DISCUSSIONS
    5.1 Introduction
    5.2 Influence of damage distance s or/and damage depth d to the PZT patches basedon the real part of PZT admittance
        5.2.1 Case 1: Damage in concrete slab
        5.2.2 Case 2: Shear Stud and concrete slab debonding
        5.2.3 Case 3: Steel beam and concrete slab debonding
    5.3 Qualitative analysis of the impact of law under different conditions by RMSD
        5.3.1 Case 1: Damage in concrete slab
        5.3.2 Case 2: Shear Stud and concrete slab debonding
        5.3.3 Case 3: Steel beam and concrete slab debonding
CHAPTER 6 CONCLUSION AND RECOMMENDATIONS
    6.1 Summary of research work
    6.2 Conclusion
    6.3 Recommendations for further research
REFERENCES
ACKNOWLEDGEMENTS


【參考文獻(xiàn)】：
期刊論文
[1]Piezoelectric Actuator/Sensor Wave Propagation Based Nondestructive Active Monitoring Method of Concrete Structures[J]. 朱勁松.  Journal of Wuhan University of Technology（Materials Science Edition）. 2011(03)
[2]鋼-混凝土組合結(jié)構(gòu)體系研究新進(jìn)展[J]. 聶建國(guó),陶慕軒,黃遠(yuǎn),田淑明,陳戈.  建筑結(jié)構(gòu)學(xué)報(bào). 2010(06)



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