INFLUENCE OF QUALITY OF MECHANICAL SPLICES ON BEHAVIOR OF REINFORCED CONCRETE MEMBERS

• Material Type: 博士論文
• Title: INFLUENCE OF QUALITY OF MECHANICAL SPLICES ON BEHAVIOR OF REINFORCED CONCRETE MEMBERS
• Author/Editor: NGUYEN, DAC PHUONG
• Author Heading: NGUYEN, DAC PHUONG
• Publication, Distribution, etc.: 埼玉大学大学院理工学研究科
• Publication Date: 2014
• Publication Date (W3CDTF): 2014
• Alternative Title: 機械式鉄筋継手の性能が鉄筋コンクリート部材の挙動におよぼす影響
• Periodical title: 博士論文（埼玉大学大学院理工学研究科（博士後期課程））
• Degree Grantor: 埼玉大学
• Date Granted: 2014-09-19
• Date Granted (W3CDTF): 2014-09-19
• Dissertation Number: 甲第967号
• Degree Type: 博士(学術)
• Conferring No. (Dissertation): 甲第967号
• Text Language Code: eng
• Target Audience: 一般
• Note (General): This thesis presents a study on mechanical splices used in reinforced concrete members.For using mechanical splices, the requirements on their quality and location inside the members should be clarified. Although quality of mechanical splices is ensured by manufacturers but the low quality splices still appear in construction sites due to improper installation of the splices. No research on such mechanical splices has been carried out. The experimental part of this study is to investigate properties of improperly installed mechanical splices and their influence on the behavior of reinforced concrete members. A corrective splice for improving such mechanical splices is newly developed. Staggering requirement of mechanical splices is also studied. The numerical part deals with predicting the behavior of reinforced concrete members using mechanical splices.The improperly installed mechanical splices are made intentionally by controlling the embedment length of the steel bars into the couplers and the existence of injected resin in the couplers. The tensile test results show that the improperly installed mechanical splices have lower performance in stiffness, tensile strength and elongation than those of the sound one or the plain steel bar.Reinforced concrete beams using improperly installed mechanical splices are designed and constructed to find out influences of such mechanical splices on behavior of the beams. The beams are tested under cyclic loading. The test results express the lower behavior in load carrying capacity, ductility and cracking of the beams using improperly installed mechanical splices compared to the beam using perfect mechanical splices or the control beam without mechanical splices.A corrective splice for improving improperly installed mechanical splices is newly developed in this study. Mechanical properties as well as their influences on the behavior of reinforced concrete members of the improperly installed mechanical splices are confirmed to be improved through tensile tests and beam tests of specimens using corrective splices fitting over the improperly installed mechanical splices.In order to clarify staggering requirement for mechanical splices, reinforced concrete columns using mechanical splices at the same cross section are designed and constructed. The specimens are tested under reversed cyclic loading controlling displacement. The test results show that the members using mechanical splices at the same cross section have almost the same behavior as the control specimen without mechanical splices. Therefore, the staggering requirement of mechanical splices should be clarified.The numerical analysis is carried out for predicting the behavior of reinforced concrete members using mechanical splices. The model applied in this thesis is modified from the well-known fiber model. The calculation of spliced section is studied by a particular procedure based on the variation of stress-strain relationship of the mechanical splice and the reinforcing steel bar. Comparison of the experimental results and the analytical results show the ability of the proposed model to describe the behavior of reinforced concrete members using mechanical splices.; ABSTRACT ........................................................................................................................... 1TABLE OF CONTENTS ....................................................................................................... 3LIST OF TABLES ................................................................................................................. 5LIST OF FIGURES ............................................................................................................... 6INTRODUCTION ................................................................................................................. 9Background ........................................................................................................................ 9Review of requirements on staggering mechanical splices in building codes ................. 10Objective and organization .............................................................................................. 11PROPERTIES OF MECHANICAL SPLICES .................................................................... 13Introduction ...................................................................................................................... 13Investigation of quality of mechanical splices in Japan .................................................. 14Experimental program ..................................................................................................... 152.2.1. Specimen ............................................................................................................ 152.2.2. Instrumentation and test setup ........................................................................... 17Test results ....................................................................................................................... 18Conclusion ....................................................................................................................... 22REINFORCED CONCRETE BEAMS USING MECHANICAL SPLICES ...................... 23Introduction ...................................................................................................................... 23Experimental program ..................................................................................................... 243.1.1. Specimen design ................................................................................................ 243.1.2. Fabrication of specimens ................................................................................... 263.1.3. Instrumentation .................................................................................................. 283.1.4. Loading method ................................................................................................. 30Experiment results and discussion ................................................................................... 313.2.1. Summary of material properties ........................................................................ 313.2.2. Beam using no mechanical splices .................................................................... 323.2.3. Beams using sufficient embedment length mechanical splices ......................... 343.2.4. Beams using three-thread embedment length mechanical splices ..................... 373.2.5. Beams using two-thread embedment length mechanical splices ....................... 413.2.6. Summary of the beam test results ...................................................................... 44Conclusion ....................................................................................................................... 47A NEWLY DEVELOPED CORRECTIVE SPLICE FOR IMPROVING IMPROPERLYINSTALLED MECHANICAL SPLICES ........................................................................... 48Introduction ...................................................................................................................... 48Configuration of the corrective splice ............................................................................. 48Tensile test ....................................................................................................................... 494.2.1. Specimens and set-up ......................................................................................... 494.2.2. Test results ......................................................................................................... 51Beam test .......................................................................................................................... 534.3.1. Specimens and test setup ................................................................................... 534.3.2. Test results ......................................................................................................... 54Conclusion ....................................................................................................................... 58REINFORCED CONCRETE MEMBERS USING MECHANICAL SPLICES UNDERCYCLIC LOADING ............................................................................................................ 60Introduction ...................................................................................................................... 60Experimental program ..................................................................................................... 615.1.1. Specimen design ................................................................................................ 615.1.2. Material properties ............................................................................................. 625.1.3. Instrumentation .................................................................................................. 655.1.4. Setup of specimens and loading method ............................................................ 66Experiment results and discussion ................................................................................... 675.2.1. Specimen No.1 using no mechanical splices ..................................................... 675.2.2. Specimen No.2 using epoxy without nuts mechanical splices .......................... 705.2.3. Specimen No.3 using epoxy with nuts mechanical splices ............................... 725.2.4. Specimen No.4 using free joint mechanical splices .......................................... 745.2.5. Specimen No.5 using bolt-top mechanical splices ............................................ 765.2.6. Summary of the test results ................................................................................ 78Conclusion ....................................................................................................................... 82NUMERICAL ANALYSIS OF REINFORCED CONCRETE MEMBERS USINGMECHANICAL SPLICES .................................................................................................. 83Introduction ...................................................................................................................... 83Modeling of reinforced concrete member using mechanical splice ................................ 846.1.1. Fiber model ........................................................................................................ 846.1.2. Materials models ................................................................................................ 886.1.3. Modified fiber model to calculate spliced sections ........................................... 90Results of analysis and correlation with experimental results ......................................... 936.2.1. Moment-curvature of sections ........................................................................... 936.2.2. Load-deformation of beams ............................................................................... 94Conclusion ....................................................................................................................... 95CONCLUSIONS & RECOMMENDATION FOR FUTURE RESEARCH ....................... 96Conclusions ...................................................................................................................... 96Recommendation for future research ............................................................................... 97REFERENCES .................................................................................................................... 99APPENDIX A. REINFORCEMENT DETAIL OF RC MEMBERS IN CHAPTER 5 ..... 104; 指導教員 : 睦好宏史
• DOI: 10.24561/00010342; https://doi.org/10.24561/00010342
• Persistent ID (NDL): info:ndljp/pid/9506305; https://dl.ndl.go.jp/pid/9506305
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• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Date Accepted (W3CDTF): 2015-10-01T11:16:23+09:00
• Format (IMT): application/pdf
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• Periodical Title (URI): https://doi.org/10.24561/00010342; http://id.nii.ac.jp/1586/00010342/
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

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2023-09-05 再収集