Papers - LI Chunhe
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Suhara K., Li C., Niwase K., Tsuji Y.
Concrete Journal 61 ( 2 ) 152 - 159 2023.1
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Concrete Institute
This paper describes a proposed method for the assessment of the durability of RC structures, which are required to have long-term durability, by considering not only oxidative corrosion, which is generally applied to the corrosion of rebar in concrete structures, but also the transition to a reducing atmosphere, where the oxygen concentration becomes very low owing to the consumption of oxygen during oxidative corrosion. It is suggested that a lower corrosion rate may be expected in a low oxygen corrosion environment through the high densification of concrete combined with the use of prestressed concrete that can reduce the assumed in-service crack width and possibly achieve zero crack width, or chemical prestressed concrete with a higher level of crack control.
DOI： 10.3151/coj.61.2_152
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材料保管温度がCPC部材の膨張性状に及ぼす影響 Reviewed
井上穂香，山口伊知郎，李春鶴，辻幸和
31回プレストレストコンクリートの発展に 関するシンポジウム論文集 31 543 - 546 2022.10
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Geunho Lee, Kouki Ogata, and Chunhe Li
IEEE Transactions on Intelligent Transportation Systems 23 ( 9 ) 14968 - 14977 2022.9
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Transactions on Intelligent Transportation Systems
With technical advances, various locomotion mechanisms for use on bumpy roads have been introduced. Among these locomotion mechanisms, crawler-based platforms are widely employed. However, due to their tilt on uneven terrain, accidents such as overturning and falling loads have been reported. To overcome these situations, this paper proposes a constant balance scheme for crawler-based transportation systems (hereinafter called crawler robots for simplicity). Practically, a variable-shape crawler robot with four foldable legs is designed to maintain a constant upper-frame posture regardless of ground conditions. The four legs by coordinating expand and contract, thereby enabling the robot to adapt to local surface conditions and configure its desired posture while traveling. The coordination-based crawler mechanism is realized by employing rack-and-pinion units for raising and lowering. The effectiveness and performance of the developed crawler robot are demonstrated by verifying its movement under continuous and discontinuous surface conditions with the use of a balanced posture from a tilted state. Specifically, we pose an innovative challenge of information transformation to maintain balance effectively. In detail, three-dimensional state variations (e.g., gradients and inclinations) of the crawler robot depending on ground conditions are transformed into one-dimensional displacements. Unlike previous works, this study presents the novel idea of coordinating the motions of individual legs to configure a variable-shape crawler robot. In other words, the crawler shape is deformed while it maintains the desired balance.
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Assessing the reliability of reinforced concrete structures under coupled degradation effect of crack development and corrosion Reviewed International coauthorship
Tiao Wang, Chunhe Li, Yao Luan， Tetsuya Ishida and Xiaoxu Huang
76th RILEM Annual Week 2022.9
Language：English Publishing type：Research paper (international conference proceedings)
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PCグラウトの強度が異なる高強度PPC梁の曲げ性状 Reviewed
李 春鶴、松浪 康行、栖原 健太郎、辻 幸和
プレストレストコンクリート 64 ( 3 ) 89 - 98 2022.5
Authorship：Lead author, Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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接合面を有するCPC梁とRC梁の力学的性状 Reviewed
栖原健太郎，松浪康行，李春鶴，辻幸和
プレストレストコンクリート 64 ( 2 ) 103 - 115 2022.3
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Development of estimation scheme for direction of signal arrival in concrete structures Reviewed
Takeshi Mizuguchi, Geunho Lee, and Chunhe Li
Proc. 27th International Symposium on Artificial Life and Robotics 27 396 - 399 2022.1
Language：English Publishing type：Research paper (international conference proceedings)
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EXPANSION AND CONTRACTION PROPERTIES OF SLAB AND WALL FENCES USING OF EXPANSIVE CONCRETE IN FULL SCALE ROAD BRIDGE SPECIMENS Reviewed
KOZU Mineki, MAEDA Takumi, IGARASHI Kazuma, SUHARA Kentaro, LI Chunhe, TSUJI Yukikazu
Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 78 ( 1 ) 62 - 71 2022.1
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
Expansive concrete has been utilized to suppress cracks of concrete for a longer time particularly for the symmetrical cross-sectional dimensions structures by using chemical prestress technology of that is introduced by the expansive additive. In order to widen the application of this technology to various concrete structures, estimating method of chemical prestress in the unsymmetrical cross-sectional dimensions concrete was proposed and was evaluated on a full-scale road bridge specimen using expansive concrete slab and wall fences. As a result, it was clarified that the chemical prestress introduced unsymmetrical crosssectional dimensions can be evaluated by the proposed estimation method. In addition, it was observed that the shrinkage cracks on the wall fences were suppressed by the chemical prestress.
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酸素消費を要因としたコンクリート中の鉄筋の腐食に関する解析的考察 Reviewed
李春鶴、松浪康行、栖原健太郎、辻 幸和
コンクリート工学論文集 32 85 - 93 2021.11
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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先打ちしたウェブ部上に非対称断面を持つT形断面CPC梁の膨張分布 Reviewed
西崎辰冶，李春鶴，栖原健太郎，辻幸和
30回プレストレストコンクリートの発展に 関するシンポジウム論文集 30 321 - 326 2021.10
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)
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Development of Hammering Test Robot for Labor-Saving Inspection Reviewed
Takeshi Mizuguchi，Chunhe Li，and Geunho Lee
Proc. the 7th International Conference on Advanced Mechatronics 17 - 18 2021.7
Language：English Publishing type：Research paper (international conference proceedings) Publisher：一般社団法人 日本機械学会
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PCグラウトのブリーディングと収縮の評価方法 Reviewed
辻幸和，李春鶴
プレストレストコンクリート 63 ( 3 ) 50 - 57 2021.5
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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SUHARA Kentaro, TSUJI Yukikazu, LI Chunhe, NISHIZAKI Tatsuya, IGARASHI Kazuma, KOZU Mineki
Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 77 ( 2 ) 25 - 36 2021.4
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
Precise practical estimation of the expansive strain distribution in cross-sectional dimension is important for effective use of CPC(Chemically pre-stressed concrete) members, but previous studies have reported only the expansive strain distribution of CPC members having symmetrical arrangement of reinforcing bars and cross-sectional dimensions. In this study, we report the estimation method and the experimental results of the expansive strain distribution of CPC members with non-symmetrical rebar arrangement in T-shaped and L-shaped cross sections. The value of the expansive strain estimated by the proposed cross-sectional analysis from the expansive strain of the JIS specimen is goodly corresponded with the experimental value using the Work-done concept.
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Development of robot-assisted acoustic inspection for social infrastructure Reviewed
Tomoyuki Hashiguchi, Geunho Lee, and Chunhe Li
Proc. 26th International Symposium on Artificial Life and Robotics 26 264 - 267 2021.1
Language：English Publishing type：Research paper (international conference proceedings)
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膨張コンクリートを用いたCPC梁の膨張分布と力学的性状 Reviewed
辻幸和，栖原健太郎，李春鶴，小竹弘寿
プレストレストコンクリート 63 ( 1 ) 97 - 106 2021.1
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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鉄筋のひずみ硬化を考慮したCPC梁の曲げ性状 Reviewed
辻幸和，栖原健太郎，李春鶴，小竹弘寿
プレストレストコンクリート 62 ( 6 ) 117 - 126 2020.11
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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壁高欄に膨張コンクリートを用いた実橋床版における使用効果の推定手法 Reviewed
李春鶴，前田拓海，神頭峰磯，辻幸和
29回プレストレストコンクリートの発展に 関するシンポジウム論文集 29 2020.10
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)
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速硬系コンクリートの床版材料への適応性検討 Reviewed
中島直輝，下村克哉，李春鶴，長塩靖祐
コンクリート構造物の補修，補強，アップグレード論文報告集 20 2020.10
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (conference, symposium, etc.)
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コンクリートの品質における雨水等の環境作用に関する考察 Reviewed
中島直輝，李春鶴
コンクリート工学年次論文集 42 ( 1 ) 479 - 484 2020.7
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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ケミカルプレストレッシング後に機械的プレストレスを導入したCPC-PPC部材の曲げ性状 Reviewed
栖原健太郎，辻幸和，李春鶴，小竹弘寿
コンクリート工学年次論文集 42 ( 2 ) 541 - 546 2020.7
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)