Koji Azuma

Profile Information

Affiliation: Professor (Dean), Faculty of Engineering, Sojo University

Degree: Master of Engineering(Kumamoto University)
Doctor of Engineering(Kumamoto University)

J-GLOBAL ID: 200901060314106009
researchmap Member ID: 1000253153

Research Interests

Research Areas

Social infrastructure (civil Engineering, architecture, disaster prevention) / Building structures and materials /

Research History

Apr, 2013 - Present

Professor, Department of Architecture, Faculty of Engineering, Sojo University
Apr, 2009 - Mar, 2013

Associate Professor, Department of Architecture, Faculty of Engineering, Sojo University
Apr, 2001 - Mar, 2009

Lecturer, Department of Architecture, Faculty of Engineering, Sojo University
Apr, 1999 - Mar, 2001

Research Associate, Department of Architecture, Kumamoto Institute of Technology

Education

Apr, 1996 - Mar, 1999

Graduate School of Science and Technology, Kumamoto University
Apr, 1994 - Mar, 1996

Kumamoto University
Apr, 1990 - Mar, 1994

Department of Architecture and Building Engineering, Faculty of Engineering, Kumamoto University

Committee Memberships

2021 - Present

第XV委員会委員長, 日本溶接会議
2021 - Present

Commission XV, Delegate, International Institute of Welding
2008 - Present

鋼構造九州地区サブネットワーク運営委員, 日本鉄鋼連盟
2007 - Present

Sub-commission XV-D, Chair, International Institute of Welding
2001 - Present

構造委員会委員, 日本建築学会九州支部
2010 - 2012

構造委員会鋼構造部会幹事, 日本建築学会九州支部

Papers

Optimization of Shapes of Weld Access Holes at the End of I-Section Beams Based on the Prediction Approach for Brittle Fracture – Part II. Effect of Propagation Direction of Ductile Cracks

Koike, S, Azuma, K, Akahoshi, T, Iwashita, T, Itatani, T

Proceedings of the 33rd International Ocean and Polar Engineering Conference, 4, Jun, 2023 Peer-reviewed
Effect of Different Modes on Fracture Prediction Using Weibull Stress to Predict Brittle Fracture from Defects at Beam-to-Column Connections

Shimizu, M, Akahoshi, T, Azuma, K, Iwashita, T

Proceedings of the 33rd International Ocean and Polar Engineering Conference, 4, Jun, 2023 Peer-reviewed
Brittle fracture prediction method considering mixed modes for column-to-beam connections

Takuya Akahoshi, Koji Azuma, Masaki Shimizu, Tsutomu Iwashita

Journal of Constructional Steel Research, 205 107885-107885, Jun, 2023 Peer-reviewed
Optimization of shapes of weld access holes at the end of I-section beams based on the prediction approach for brittle fracture

Gotanda, S, Azuma, K, Iwashita, T, Itatani, T

Proceedings of the 32nd International Ocean and Polar Engineering Conference, 4 2943-2949, Jun, 2022 Peer-reviewed
STUDY ON CORRECTING METHOD FOR PREDICTING BRITTLE FRACTURE OF SURFACE CRACKED PLATES IN MIXED-MODE LOADING

Takuya Akahoshi, Koji Azuma, Tsutomu Iwashita

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 3, Jun, 2022
Improvement of weld details to avoid brittle fracture initiating at the toes of weld access hole of the beam end — prediction of ultimate strength of welded joint with conventional detail

Koji Azuma, Tsutomu Iwashita, Toshiomi Itatani

Welding in the World, 66(9) 1929-1939, Apr 28, 2022 Peer-reviewed
Brittle fracture estimation at ends of groove welded joints under cyclic loading

Tsutomu Iwashita, Mizuki Hamasaki, Takuya Akahoshi, Koji Azuma

Journal of Constructional Steel Research, 107055-107055, Dec, 2021 Peer-reviewed
Study on Establish a Brittle Fracture Prediction Considering Different Crack Opening Modes Using Mixed-Mode Ratio

Takuya Akahoshi, Koji Azuma, Tsutomu Iwashita, Toshiomi Itatani

Applied Mechanics, 2(4) 849-862, Oct 18, 2021 Peer-reviewed
Weibull stress approach considering a mixed-mode problem for prediction of brittle fracture from notches at the butt weld of the beam end

Takuya Akahoshi, Koji Azuma, Tsutomu Iwashita, Yoshiaki Ibe

Proceedings of the 31st International Ocean and Polar Engineering Conference, (4) 2375-2382, Jun, 2021 Peer-reviewed
Brittle Fracture Prediction with the Weibull Stress Approach for Notched Specimens under Cyclic Loading

IWASHITA Tsutomu, AZUMA Koji

Proceedings of The 16th International Symposium on Tubular Structures, 255-262, Dec, 2019 Peer-reviewed
Effects of Cyclic Loading on Plastic Deformation Capacity for Notched Specimens with Brittle Fracture

Iwashita, T, Azuma, K

Proceedings of The 12th Pacific Structural Steel Conference, Nov, 2019 Peer-reviewed
Prediction of brittle fracture in notched specimens under cyclic loading

IWASHITA Tsutomu, Azuma Koji

Journal of Constructional Steel Research, 162 105721, Nov, 2019 Peer-reviewed
A Study on Occurrence of Brittle Fracture of Steel Notched Specimens under Cyclic Loading with Different Fracture Toughness

Matsuda, F, Iwashita, T, Azuma, K

Proceedings of the 12th International Symposium on Plasticity and Impact Mechanics, Sep, 2019 Peer-reviewed
Improvement of the Work Efficiency and Optimization of the Material Properties in Heating Correction Processes of Welded I-section Steels

Koji Azuma, Shota Yasuda, Toshiomi Itatani, Yoichi Nakamura, Masahiro Murayama

IIW Doc. XV-1587-19, 1-9, Jul, 2019 Peer-reviewed
Prediction of Brittle Fracture at the Crack tips of Improved Weld Access Hole of Full-scale Beam-to-Column Assembly

Satoshi Jimbo, Koji Azuma, Toshiomi Itatani, Masato Nikaido

Proceedings of the 29th International Offshore and Polar Engineering Conference, (4) 4034-4039, Jun, 2019 Peer-reviewed
Prediction of Brittle Fracture of at the Toes of Weld Access Hole of the Welded I-section Beam End

Junwei Wang, Koji Azuma, Tsutomu Iwashita, Toshiomi Itatani

Proceedings of the 29th International Offshore and Polar Engineering Conference, (4) 4028-4033, Jun, 2019 Peer-reviewed
Calculation of Shear Strength of Reinforced Concrete Members with Circular Section using the Extended Modified Compression Field Theory

Matsumoto, Y, Shimazu, M, Hayashi M, Azuma, K, Kurihara, K

Journal of Asian Architecture and Building Engineering, 17(3) 481-485, Sep, 2018 Peer-reviewed
Prediction of Brittle Fracture from Notches at the Toes of Butt Weld and Weld Access Hole of the Beam End

Azuma K, Akahoshi T, Iwashita T, Itatani, T

IIW Doc. XV-1571-18, 1-13, Jul, 2018 Peer-reviewed
Cumulative Damage of Notched Specimens with Brittle Fracture under Cyclic Loading

Iwashita, T. Tateno, A, Azuma, K

Tubular Structures XVI, Proc. of 16th Int. Symposium on Tubular Structures, 373-379, Dec, 2017 Peer-reviewed
Effects of Cyclic Loading on Brittle Fracture in Steel Notched Specimens with Different Toughness

Iwashita, T, Azuma, K

14th International Conference on Fracture, ICF14, Jun, 2017 Peer-reviewed

Misc.

溶接組立部材の加熱矯正シミュレーション手法の提案

徳丸悠二郎, 廣畑幹人, 武川哲, 岡田誠司, 東康二

鋼構造年次論文報告集, 28 731-73, Nov, 2020 Peer-reviewed
破壊靱性の異なる鋼試験片の切欠きから発生する脆性破壊予測

岩下勉, 東康二

鋼構造年次論文報告集, 28 974-981, Nov, 2020 Peer-reviewed
溶接欠陥から発生する脆性破壊のワイブル応力による予測

濵﨑瑞生, 岩下勉, 東康二

鋼構造年次論文報告集, 28 460-468, Nov, 2020 Peer-reviewed
溶接 H 形鋼の加熱矯正工程の作業効率向上と鋼材特性に関する報告

安田匠汰, 東康二, 板谷俊臣, 中村洋一, 村山将広

鋼構造年次論文報告集, 26 456-461, Nov, 2018 Peer-reviewed
Cumulative Damage of Notched Specimens on Brittle Fracture with Ductile Crack

IWASHITA Tsutomu, Fumiya MATSUDA, Koji AZUMA

Proceedings of Constructional Steel, 26 709-715, Nov, 2018 Peer-reviewed
OUTLINE OF RECONNAISSANCE OF DAMAGED STEEL SCHOOL BUILDINGS DUE TO THE 2016 KUMAMOTO EARTHQUAKE

IYAMA Jun, SEIKE Tsuyoshi, MATSUO Shintaro, KISHIKI Shoichi, ISHIDA Takanori, AZUMA Koji, KIDO Masae, IWASHITA Tsutomu, SAWADA Kiichiro, YAMADA Satoshi

Aij Journal of TECHNOLOGY and Design, 24(56) 183-188, 2018
拡張された修正圧縮場理論による片袖壁付きRC柱のせん断耐力の検討

コンクリート工学年次論文集, Vol. 38 703-708, Jul, 2016 Peer-reviewed
An Analytical Study on Shear Strength for Various Extremely Short CFT Columns Based on Extended Modified Compression Field Theory

MATSUMOTO Yutaka, HAYASHI Miki, AZUMA Koji, KURIHARA Kazuo

(55) 557-560, Mar, 2016
22407 Method of prediction for brittle fracture initiating at defects in the end of complete joint penetration groove welds

AKAHOSHI Takuya, AZUMA Koji, IWASHITA Tsutomu

Summaries of technical papers of annual meeting, 2015 813-814, Sep 4, 2015
Prediction of brittle fracture initiating at tips of ductile cracks growing from defects in the end of weld terminations

AKAHOSHI Takuya, AZUMA Koji, IWASHITA Tsutomu

(54) 425-428, Mar, 2015
22526 Numerical simulation of brittle fracture initiating at defects at weld toes of starting and stopping ends of welded joints

SAKAMOTO Takaho, AZUMA Koji, IWASHITA Tsutomu

Summaries of technical papers of annual meeting, 2013 1051-1052, Aug 30, 2013
22354 Brittle Fracture of Single Edge Notched Bend Specimens with Different Notch Depths (Fatigue Crack and Machined-Notch) : Part 2 Stress State at around Notch Tips

IWASHITA Tsutomu, KOBAYASHI Ryohei, AZUMA Koji

Summaries of technical papers of annual meeting, 2013 707-708, Aug 30, 2013
Numerical Simulation of Brittle fracture initiating at toes of surface cracks in weld terminations

SAKAMOTO Takaho, AZUMA Koji, IWASHITA Tsutomu

(52) 417-420, Mar, 2013
22549 Brittle Fracture of Single Edge Notched Bend Specimens with Different Notch Depths (Fatigue Crack and Machined-Notch) : Weibull Stress Analysis

KOBAYASHI Ryohei, IWASHITA Tsutomu, AZUMA Koji

Summaries of technical papers of annual meeting, 2012 1097-1098, Sep 12, 2012
313 Brittle Fracture of Single Edge Notched Bend Specimens with Different Machined-Notch Depth : Weibull Stress Analysis

KOBAYASHI Ryohei, IWASHITA Tsutomu, AZUMA Koji

(51) 673-676, Mar 1, 2012
21394 Proposal of an Axial Vibration Damper with Displacement-Proportional Frictional Force

KATAYAMA Takuro, AZUMA Koji

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants, 2011 787-788, Jul 20, 2011
254 Brittle fracture from terminations of welded joints with defects : Study on Toughness Scaling Model

MENO Chikara, IWASHITA Tsutomu, AZUMA Koji

(49) 373-376, Mar 1, 2010
22504 Effects of ductile crack on brittle fracture assessment of single edge notched bend specimens with different crack depth

IWASHITA Tsutomu, AZUMA Koji

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures, 2009 1007-1008, Jul 20, 2009
242 Fracture Toughness of Single Edge Notched Bend and Double Edge Notched Tension Specimens with Different Thickness

MENO Chikara, KOGA Yuki, IWASHITA Tsutomu, AZUMA Koji

(48) 369-372, Mar 1, 2009
22312 Effects of plastic constraint on fracture toughness : Part 2 Study on Weibull stress and Toughness Scaling Model

IWASHITA Tsutomu, KOGA Yuki, AZUMA Koji

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures, 2008 623-624, Jul 20, 2008

Presentations

71) 繰返し載荷を受ける切欠きを有する鋼試験片の塑性変形能力に関する研究その5 ワイブル応力を用いた変形能力推定方法の検討

日本建築学会大会学術講演梗概集(東北), 2018
70) 繰返し載荷を受ける切欠きを有する鋼試験片の塑性変形能力に関する研究その4 ワイブル応力による検討

日本建築学会大会学術講演梗概集(中国), 2017
69) 繰返し載荷を受ける切欠きを有する鋼試験片の塑性変形能力に関する研究その 3 損傷度と延性き裂進展の検討

日本建築学会大会学術講演梗概集(中国), 2017
68) 修正圧縮場理論による長方形CFT極短柱のせん断耐力についての解析的研究

日本建築学会九州支部研究報告第56号，pp.533-536, 2017
67) 片側袖壁付き RC 柱の構造特性に関する研究

日本建築学会大会学術講演梗概集(福岡) ， pp.13-14, 2016
66) 修正圧縮場理論による片側袖壁付きＲＣ柱のせん断耐力についての解析的研究

日本建築学会九州支部研究報告第55 号・1, 構造系, pp., 2016
65) 修正圧縮場理論による各種ＣＦＴ極短柱のせん断耐力についての解析的研究

日本建築学会九州支部研究報告第55 号・1, 構造系, pp., 2016
64) 完全溶込溶接始終端部の欠陥から発生する脆性破壊の予測手法の検討

日本建築学会大会学術講演梗概集（関東），, 2015
63) 修正圧縮場理論による片袖壁付きRC柱のせん断耐力の検討

日本建築学会大会学術講演梗概集（関東），, 2015
62) 溶接始終端部の欠陥から進展した延性き裂起点とする脆性破壊の予測

日本建築学会九州支部研究報告第54号・1, 構造系, pp. 425-428, 2015
61) 異なる深さの疲労き裂あるいは機械切欠きを有する3 点曲げ試験片の脆性破壊に関する研究その２切欠き先端周辺の応力状態の考察

日本建築学会大会学術講演梗概集（北海道），構造?，pp. 707-708, 2013
60) 溶接始終端の止端部に存在する切欠きを起点とする脆性破壊の数値シミュレーション

日本建築学会大会学術講演梗概集（北海道），構造?，pp. 1051-1052, 2013
59) 溶接始終端の表面欠陥を起点とする脆性破壊の数値シミュレーション

日本建築学会九州支部研究報告第52号・1, 構造系, pp. 417-420, 2013
58) 異なる深さの機械切欠きを有する3 点曲げ試験片の脆性破壊に関する研究 ‐ワイブル応力による検討‐

日本建築学会九州支部研究報告第51号・1, 構造系, pp. 673-676, 2012
57) 変位比例摩擦力を生成する軸力部材型振動減衰装置の提案

日本建築学会大会学術講演梗概集（関東），構造?，pp. 787-788, 2011
56) 欠陥を有する溶接始終端部の脆性破壊に関する研究 Toughness Scaling Model による検討

日本建築学会九州支部研究報告第49号・1, 構造系, pp. 373-376, 2010
55) 切欠き深さの異なる3 点曲げ試験片の脆性破壊評価における延性き裂進展の影響

日本建築学会大会学術講演梗概集（東北），構造?，pp. 1007-1008, 2009
54) 板厚の異なる3点曲げ試験片と両端貫通切欠き試験片の破壊靭性

日本建築学会九州支部研究報告第48号・1, 構造系, pp. 369-372, 2009
53) 塑性拘束の違いが破壊靱性に及ぼす影響（その２．ワイブル応力とToughness Scaling Modelによる検討）

日本建築学会大会学術講演梗概集（中国）構造?, pp. 623-624, 2008
52) 塑性拘束の違いが破壊靭性に及ぼす影響（その１．実験と有限要素解析）

日本建築学会大会学術講演梗概集（中国）構造?, pp. 621-622, 2008

Professional Memberships

Works

Research Projects

Estimation Method of Accumulated Plastic Deformation Capacity with Charpy Absorbed Energy Considering Effects of Cyclic Loading and Plastic Constraint

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2025
Optimization of Weld Details to Avoid the Brittle Fractures at the Beam End with Field Welding

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2025
Brittle Fracture Assessment of Welded Connections Considering Deterioration of Fracture Toughness due to Cyclic Loading

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2022

Iwashita Tsutomu
脆性破壊の予測手法に基づく梁端溶接部の接合部詳細の最適化－接合部の品質管理基準

科学研究費補助金基盤研究C, 日本学術振興会, 2019 - 2021

東康二
溶接欠陥に起因する脆性破壊に決定つ?けられる終局耐力の予測―接合部の品質管理基準

科学研究費補助金基盤研究C, 日本学術振興会, 2016 - 2018

東康二
欠陥を起点とする延性亀裂の進展と脆性破壊への転化の予測−接合部の品質管理基準

科学研究費補助金基盤研究C, 日本学術振興会, 2013 - 2015

東康二
溶接欠陥から進展した延性亀裂を起点とする脆性破壊発生の予測−接合部の品質管理基準

科学研究費補助金基盤研究C, 日本学術振興会, 2010 - 2012

東康二
脆性破壊に先行する延性不安定破壊の数値シミュレーション−溶接欠陥の品質管理基準

科学研究費補助金若手研究B, 日本学術振興会, 2005 - 2006

東康二
溶接始終端の欠陥より成長する脆性破壊の数値シミュレーション−鉄骨の品質管理の改善を目指す−

科学研究費補助金若手研究B, 日本学術振興会, 2002 - 2003

東康二
欠陥を含む現場溶接接合部の破壊靱性の評価−鉄骨の品質管理の最適化を目指す−

科学研究費補助金基盤研究C, 日本学術振興会, 2001 - 2002

黒羽啓明
欠陥を有する溶接接合部の破壊に対する安全性の評価に関する研究
Assessment of safety of welded connections with weld defects from brittle fracture

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