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研究生： Nguyen Dang Nguyen
Nguyen - Dang Nguyen
論文名稱： Cyclic Behavior of Corroded Reinforced Concrete Beams
Cyclic Behavior of Corroded Reinforced Concrete Beams
指導教授： 歐昱辰
Yu-Chen Ou
口試委員: 張國鎮
Kuo-Chun Chang
王仲宇
Chung-Yue Wang
宋裕祺
Yu-Chi Sung
洪崇展
Chung-Chan Hung
邱建國
Chien-Kuo Chiu
學位類別： 博士
Doctor
系所名稱： 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年： 2015
畢業學年度： 103
語文別： 英文
論文頁數： 362
外文關鍵詞： corrosion location, plastic hinge length.
相關次數： 點閱：318  下載：21 
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    • Many earthquake prone regions such as Taiwan, Japan, California and New Zealand have their populated areas close to coastline. Reinforced concrete structures in these regions are susceptible to the combined hazards of reinforcement corrosion and seismic actions. However, the seismic behavior of reinforced concrete members with corroded steel reinforcement is not well understood and current seismic evaluation method is not capable of considering the effects of reinforcement corrosion.
    This research investigated the cyclic performance of corroded reinforced concrete beams using large-scale specimens. Corrosion was induced by the electrochemical accelerated corrosion method to (1) the top and bottom longitudinal reinforcement, (2) bottom longitudinal reinforcement, and (3) both longitudinal and transverse reinforcement of the potential plastic hinge region, and (4) to the top and bottom longitudinal reinforcement of the transition region. After the corrosion process, the beams were tested using cyclic loading. Test results together with those from a previous study were used to examine the effects of corrosion locations on the cyclic performance of the beam.
    Existing plastic hinge length formulations for reinforced concrete members do not consider the effect of steel reinforcement corrosion. A non-linear finite element analysis method was developed, and verified by experimental results of corroded reinforced concrete beams. A parametric study was then conducted to examine the influences of concrete compressive strength, the longitudinal tension reinforcement ratio, shear span, and corrosion level on the plastic hinge length ( ) of reinforced concrete beams.
    A modified axial-shear-flexure interaction approach (MASFI) is proposed for predicting the lateral force-displacement response of uncorroded and corroded reinforced concrete beams. Similar to the original ASFI, two interactive models are considered in the MASFI: the axial-flexure model and the axial-shear model. Compared to the original ASFI, two modifications are proposed in the MASFI. First, the flexural compression zone in the axial-flexure model is softened by using average transverse reinforcement strain in the MASFI instead of the principal tensile strain in the ASFI. Moreover, core concrete confinement, and buckling behavior of compression bars are reduced in the MASFI with increasing transverse reinforcement strain induced by shear force, which is not considered in the ASFI. The effects of corrosion are considered in the MASFI by softening cover concrete in compression, decreasing the cross-sectional area, yield and ultimate strengths and ultimate strain of steel reinforcement, and modifying crack spacing due to bond reduction. Residual cross-sectional area of longitudinal reinforcement is calculated based on average corrosion weight loss. Effects of transverse reinforcement on concrete confinement and bond strength are estimated based on minimum residual diameter of transverse reinforcement. Shear strength contributed by steel reinforcement is computed based on the average value of average corrosion weight loss and maximum corrosion weight loss at the pitting location. The MASFI with and without corrosion considerations are verified using experimental results of three uncorroded and 19 corroded RC beams.

    Table of Contents ABSTRACT i Acknowledgment iii Table of Contents iv List of Tables ix List of Figures x Chapter 1 Introduction 1 1.1 Background 1 1.2 Research objectives and scopes 4 1.3 Organization of dissertation 4 Chapter 2 Back ground and literature review 8 2.1 Corrosion of steel in concrete 8 2.1.1 Causes of corrosion in reinforced concrete 9 2.1.2 Types of corrosion in Reinforced concrete 12 2.2 Effect of corrosion on material properties 13 2.2.1 Effect of corrosion on concrete 13 2.2.2 Effect of corrosion on bond strength between corroded steel and concrete 14 2.2.3 Effect of corrosion on tensile and compressive steel properties 15 2.3 Effect of corrosion on member performance 20 2.3.1 Effect of corrosion on flexural strength of RC members 20 2.3.2 Effect of corrosion on shear strength of RC members 24 2.4 Examination of previous experimental research 28 Chapter 3 Specimen design and experimental program 40 3.1 Specimen design 40 3.1.1 Code requirements for material properties 40 3.1.2 Geometric requirements for beam cross section 41 3.1.3 Longitudinal reinforcement requirements 42 3.1.4 Transverse reinforcement requirements 44 3.1.5 Shear strength requirements 44 3.2 Test program 48 3.2.1 Fabrication of test specimens 49 3.3 Material properties 50 3.3.1 Concrete 50 3.3.2 Steel reinforcement 50 3.4 Accelerated corrosion process 51 3.5 Scanning electron microscope / Energy dispersive spectroscopy (SED/EDS) 52 3.6 Corrosion cracks measurement after accelerated corrosion process 53 3.7 Test set up and instrumentation 54 3.7.1 Test setup 54 3.7.2 Displacement and rotation measurements 54 3.7.3 Loading history 55 3.7.4 Cyclic test procedure 55 3.8 Corrosion measurement 56 3.8.1 Extraction of corroded steel reinforcement 56 3.8.2 Reinforcement corrosion measurement 56 Chapter 4 Experimental result and analysis 72 4.1 Corrosion cracks and weight loss 72 4.2 Hysteresis loops, envelopse reponses, and performance indicators 74 4.3 Damage observations 75 4.4 Effect of corrosion locations on performance indicators 82 4.4.1 Idealized yield drift 83 4.4.2 Peak load and idealized yield load 84 4.4.3 Ultimate drift 85 4.4.4 Verification using test results of TB- and TBH-type speciemens 87 4.4.5 Ductility 88 Chapter 5 Plastic hinge length of corroded RC beams 109 5.1 Finite element modeling 109 5.1.1 General description 109 5.1.2 Concrete modeling 110 5.1.3 Steel reinforcement modeling 113 5.1.4 Bond interaction modeling 115 5.1.5 Finite element validation 116 5.2 Plastic hinge length: Parametric study 117 5.2.1 Beams for parametric study 117 5.2.2 Method to calculate plastic hinge length 118 5.2.3 Results and discussion 121 Chapter 6 Modified Axial-shear-flexure interaction to predict lateral load-displacement of uncorroded and corroded RC beams. 134 6.1 Back ground and objective 134 6.2 Original axial-shear-flexure interaction (ASFI) 140 6.3 Modified axial-shear-flexure interaction (MASFI) and modified axial-shear-flexure interaction considering corrosion effect (MASFI-C) 143 6.3.1 Material constitutive laws 145 6.4 Model verification 157 Chapter 7 Conclusions and Suggestions 178 7.1 Conclusions 178 7.2 Suggestions 181 References 182 APPENDIX A: Photos of corrosion cracks on the corroded region of the beams 191 APPENDIX B: Curvature, shear strain distributions and contributions 206 APPENDIX C: Photos of corroded RC beams during the tests 227 APPENDIX D: Steel reinforcement corrosion measurement 269 APPENDIX E: Corroded steel reinforcement after testing 283 APPENDIX F: Equivalent viscous damping ratio and energy dissipation 297 APPENDIX G: Relationships of plastic hinge length with concrete compression strength, longitudinal tension reinforcement, shear span, and corrosion level 305 APPENDIX H: Matlab code of Modified axial-shear flexure interaction model. 312

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