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査読のあった論文(with review)
2016 Liyanto EDDY, Kohei NAGAI: Numerical Simulation of Beam-column Knee Joints with Mechanical Anchorages by 3D Rigid Body Spring Model, Engineering Structures, Vol. 126, pp.547-558, 2016.
Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI: Effect of Perpendicular Beams on Failure of Beam-column Knee Joints with Mechanical Anchorages by 3D RBSM, Journal of Asian Concrete Federation, Vol. 2, No. 1, pp. 56-66, 2016.
Koji MATSUMOTO, Tao WANG, Daisuke HAYASHI, Kohei NAGAI: Investigation on the Pull-out Behavior of Deformed Bars in Cracked Reinforced Concrete, Journal of Advanced Concrete Technology, Vol.14, No.9, pp.573-589, 2016.
山口寛史, 長井 宏平, 松本浩嗣, 千々和伸浩: 外来液状水がコンクリート中の異形鉄筋の疲労引抜き破壊性状に及ぼす影響,コンクリート工学年次論文集, Vol.38, No.2, pp.649-654, 2016.
2015 Liyanto EDDY, Kohei NAGAI: Effect of Stirrups Arrangement on Failure of Beam Column Joint with Mechanical Anchorages by 3D Discrete Model, コンクリート工学年次論文集, Vol.37, No.2, pp.313-318, 2015.
小池 真登,長井 宏平: 新潟県市町村における橋梁点検データを用いた経年劣化傾向分析,コンクリート工学年次論文集, Vol.37, No.2, pp.1339-1344, 2015.
2014 Kohei NAGAI, Daisuke HAYASHI, Liyanto EDDY: Numerical Simulation of Failure of Anchorage with Shifted Mechanical Anchorage Bars by 3D Discrete Model, Advances in Structural Engineering, Vol.17, No.6, pp.861-870, 2014.
Liyanto EDDY, Kohei NAGAI, Ram Chandra NEUPANE:A Study on Residual Capacity of Reinforced Concrete Corbel Failed by Anchorage Splitting Failure, コンクリート工学年次論文集, Vol.36, No.2, pp.1213-1218, 2014.
Ram Chandra NEUPANE, Kohei NAGAI, Structural Strengthening of RC Corbel Subjected to Local Failure Criterion by External CFRP Wrap, コンクリート工学年次論文集, Vol.36, No.2, pp.1255-1260, 2014.
高野芳行, 小島梨恵子, 長井宏平: 画像解析システムを用いた粗骨材入りPVA-ECC梁のせん断特性の検証,コンクリート工学年次論文集, Vol.36, No.2, pp.1141-1146, 2014.
2013 Benny SURYANTO, Koichi MAEKAWA, Kohei NAGA: Predicting the Creep Strain of PVA-ECC at High Stress Levels based on the Evolution of Plasticity and Damage, Journal of Advanced Concrete Technology, Vol.11, No.2, pp.35-48, 2013.
林大輔,長井宏平:三次元離散解析手法による多方向配筋時のRC定着性能の微細構造解析,土木学会論文集E2, Vol.69, No.2, pp.241-257, 2013.
Daisuke HAYASHI, Kohei NAGAI: Investigating the anchorage performance of RC by using three-dimensional discrete analysis, Engineering Computations, Vol.30, No.6, pp.815-824, 2013.
生田浩一郎,長井宏平,林大輔,吉武謙二:L字型RC柱梁接合部の破壊性状に及ぼす鉄筋曲げ内半径の影響に関する解析的研究,コンクリート工学年次論文集, Vol.35, No.2, pp.235-240, 2013.
吉武謙二,小川晃,小倉大季,長井宏平:柱梁接合部の構造性能に及ぼす梁軸方向鉄筋の定着仕様および寸法効果の影響,コンクリート工学年次論文集, Vol.35, No.2, pp.583-588, 2013.
Mari NAKASHIMA, Kohei NAGAI: An Investigation of Road Bridge Maintenance System in Japan in Developed Society, Society for Social Management Systems Internet Journal, serial No.SMS13-2192, 2013.
Hirotoshi MAKABE, Taro UCHIMURA, Kohei NAGAI: Press-in Resistance in Multi-layer Ground of Sand, Gravel, and Cohesive Soils Observed in Scaled Models, PRESS-IN ENGINEERING 2013:Proceedings of 4th IPA International Workshop in Singapore, Vol.3, 56-61, 2013.
2012 Jian-Guo DAI, Tamon UEDA, Yasuhiko SATO, Kohei NAGAI "Modeling of Tension Stiffening Behavior in FRP-Strengthened RC Members Based on Rigid Body Spring Networks" Computer-Aided Civil and Infrastructure Engineering, 27, pp.406?418, 2012
Yukari YAGI, Kohei NAGAI, Naofumi SUZUKI, Petr MATOUS "A Survey of Social Support Networks in a Depopulating Japanese Village" Society for Social Management Systems Internet Journal, Society for Social Management Systems, serial No.SMS12-4216, 2012
Suryanto Benny, Koichi MAEKAWA, Kohei NAGAI "Time dependent deformations of PVA-ECC under sustained loads: correlation with plasticity and damage" コンクリート工学年次論文集,Vol.34,No.1, pp.280-285, 2012
林大輔,長井宏平,吉武謙二、小倉大季 "三次元離散解析による鉄筋あきが定着性能に及ぼす影響の評価" コンクリート工学年次論文集,Vol.34,No.2, pp.559-564, 2012
2011 Kohei NAGAI, Taro UCHIMURA, Yuya SAKAI, Koichi MAEKAWA: Numerical Simulation of Press-in Behavior in a Heterogeneous Field using Aluminum Rods Layer by Discrete Analysis Method, PRESS-IN ENGINEERING 2011, pp.32-45, 2011
井上友,長井宏平: 三次元RBSM解析による鉄筋コンクリートの定着性能の評価, コンクリート工学年次論文集, 33, 2, pp.643-648, 2011
林大輔,井上友,長井宏平: 定着長を変化させたフックのひずみ分布と三次元解析による検討, コンクリート工学年次論文集, 33, 2, pp.589-594, 2011
Benny SURYANTO, Mahyarudin DALIMUNTHE, Kohei NAGAI, Koichi MAEKAWA: Shear Fatigue Performance and Crack Surface Observations in PVA-ECC Beams without Web Reinforcement, コンクリート工学年次論文集, 33, 2, pp.1279-1284, 2011
Mahyarudin DALIMUNTHE, Benny SURYANTO, Kohei NAGAI: Pre- and Post-Yielding Tensile Behaviors of R/HPFRCC, コンクリート工学年次論文集, 33, 2, pp.1231-1236, 2011
Kohei NAGAI, Mariko YABE, Ryo KANAMORI: A Study on the Frequency of Movements in a Mountainous Region focusing on Age-group and Areas of Activities, Society for Social Management Systems Internet Journal, Society for Social Management Systems, serial No.SMS11-8306, 2011
Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA: Space-averaged Constitutive model for HPFRCC with Multi-directional Cracking, ACI Material Journal, 108, 2, pp.139-149, 2011
2010 長井宏平,家辺麻里子,金森亮 "年齢層と行動範囲に着目した中山間地域住民の移動頻度の研究" 農村計画学会誌, Vol.29, pp.311-316,2010
Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA "Smeared-crack modeling of R/ECC membranes incorporating an explicit shear transfer model", Journal of Advanced Concrete Technology, Vol.8, No.3, pp.315-326, 2010.

Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Bidirectional Multiple Cracking Tests on HPFRCC Plates” ACI Material Journal, Vol.107, No.5, 2010

長井宏平, 大胡賢一 “機械式定着具を用いた定着部の損傷時における静的定着性能” コンクリート工学年次論文集, Vol.32, No.2, pp.601-606, 2010

大胡賢一, 長井宏平 “機械式定着具からの応力伝達に着目した破壊形態及び定着体の検討” コンクリート工学年次論文集, Vol.32, No.2, pp.607-612, 2010
Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Investigating Shear Transfer Across Cracks in High Performance Steel Fiber-reinforced Concrete” コンクリート工学年次論文集, Vol.32, No.2, pp.1285-1290, 2010
Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Modeling and Analysis of Shear-critical ECC Members with Anisotropic Stress and Strain Fields” Journal of Advanced Concrete Technology, Vol.8, No.2, pp.239-258, 2010
Kohei NAGAI, Koji MATSUMOTO “Static and Fatigue Failure Simulation of Concrete Material by Discrete Analysis” Proceeding the 7th International Conference on Fracture Mechanics of Concrete and Concrete Structure (FraMCos-7), Vol.1, pp.540-547, 2010
Haruka NISHIMOTO, Kohei NAGAI, Naofumi SUZUKI “A Study on the Living Space of the Residents in a Remote MountainousVillage: A Case of Choja Village in Niyodogawa-cho, Kochi, Japan” Society for Social Management Systems Internet Journal, Society for Social Management Systems, serial No.SMS10-141, 2010
2009

Taro UCHIMURA,Koichi MAEKAWA,Phouthaphone VORABOUTH,Kohei NAGAI ”Nonlinear Soil-structure Interaction with Press-in Piles and System Performance Assessment” PRESS-IN ENGINEERING 2009:Proceedings of 2nd IPA International Workshop in New Orleans, Vol.1, No.1, pp.25-33, 2009

Tamon UEDA, Muttaqin HASAN, Kohei NAGAI, Yasuhiko SATO, Licheng WANG “Meso-scale Simulation of the Influence of Frost Damage on Mechanical Properties of Concrete” Journal of Materials in Civil Engineering, ASCE, Vol.21, NO.6, pp.244-252, 2009

酒井雄也,長井宏平,大胡賢一,前川宏一 “ 非均質流動体の力学相互作用に着目した閉塞機構の基礎検討” コンクリート工学年次論文集, Vol.31, No.1, pp.1411-1416, 2009

Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Role of Coarse Aggregate in High Performance Fiber Reinforced Cementitious Composite” コンクリート工学年次論文集, Vol.31, No.1, pp.385-390, 2009

2008 長井宏平Benny SURYANTO, 前川宏一 二方向ひび割れを有するHPFRCCの空間平均化構成モデルの構築 コンクリート工学年次論文報告集,2008, Vol.30, No.1, pp.225-230.
Benny SURYANTO,長井宏平, 前川宏一 A Bi-directional Cracking Test of High Performance Fiber Reinforced Cementitious Composite コンクリート工学年次論文報告集,2008, Vol.30, No.2, pp.279-284.
2005

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Mesoscopic Simulation of Failure of Mortar and Concrete by 3D RBSM” Journal of Advanced Concrete Technology, Vol.3, No.3, 2005, pp.385-402.

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Three-dimensional Mesoscopic Simulation of Concrete under Biaxial Stress Condition by RBSM” コンクリート工学年次論文報告集,2005, Vol.27, No.2, pp.175-180.
2004

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Mesoscopic Simulation of Failure of Mortar and Concrete by 2D RBSM” Journal of Advanced Concrete Technology, Vol.2, No.3, 2004, pp.359-374.

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA  “Three-dimensional Meso-scopic Analyses of Mortar and Concrete Model by Rigid Body Spring Model”  Proceeding of Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structure (FraMCos-5), 2004, Vol.1, pp.353-360.

Tamon UEDA, Muttaqin HASAN, Kohei NAGAI, Yasuhiko SATO  “Stress-strain Relationship of Concrete Damaged by Freezing and Thawing Cycles”  Proceeding of Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structure (FraMCos-5), 2004, Vol.2, pp.645-652.

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Analytical Study on Influence of Mortar-aggregate Interface Character on Concrete Strength by RBSM” コンクリート工学年次論文報告集,2004, Vol.26, No.2, pp.151-156.
Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Three-dimensional Numerical Simulation of Mortar and Concrete Model Failure in Meso Level by Rigid Body Spring Model” 構造工学論文集,2004, Vol.50A, pp.167-178.
2003

奥山英俊,長井宏平,佐藤靖彦 付着モルタルが再生コンクリートの力学特性に及ぼす影響の解析的評価 コンクリート工学年次論文報告集,2003, Vol.25, No.1, pp.1235-1245.

2002

Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA, Yoshio KAKUTA “Numerical Simulation of Fracture Process of Concrete Model by Rigid Body Spring Method” コンクリート工学年次論文報告集,2002, Vol.24, No.2, pp.163-168.

Muttaqin HASAN, Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Tensile Stress-Crack Width Model for Plane Concrete Damaged by Freezing and Thawing Action” コンクリート工学年次論文報告集,2002,Vol.24, No.2, pp.109-114.
Muttaqin HASAN, Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA   “Stress-strain Behavior in Tension and Compression of Concrete Damaged by Freezing and Thawing Cycles”  Proceeding of the International RILEM Workshop on Frost Resistance of Concrete, 2002, pp.335-342.

査読のなかった論文(without review)
2016 Kohei NAGAI, Liyanto EDDY: A Study on the Effect of Diagonal Cracks Opening on the Failure Behavior of RC Beam-column Join with Mechanical Anchorage by 3D RBSM, Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9), 2016. (DOI 10.21012/FC9.114)
Daisuke HAYASHI, Kohei NAGAI: Meso-scale Approach to Investigate the Bond Performance of Anchorage in Reinforced Concrete, Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9), 2016. (DOI 10.21012/FC9.123)
Punyawut JIRADILOK, Kohei NAGAI, Koji MATSUMOTO, Liyanto EDDY: Development of Rebar Corrosion Expansion Model based on 3D RBSM Simulation, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB)
Anupam AWASTHI, Kohei NAGAI, Shingo ASAMOTO, Seishi GOTO: Study of Possible Causes of Premature Cracking of Sleepers in Indian Railways, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB) (in Conference USB)
Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI, Takeshi MIYASHITA, Zin Naung Htut: A Proposal of Installation of Simple Monitoring System for Damaged Bridges in Myanmar, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB)
Toshiki SASAKI, Michael HENRY, Koji MATSUMOTO, Kohei NAGAI, Hiroshi YOKOTA: Maintenance Management for Road Bridge Infrastructure: The Current State in Thailand and Myanmar, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB)
Tao WANG, Koji MATSUMOTO, Kohei NAGAI: Effect of Transverse Bar on Anchorage Performance in Damaged RC with Mechanical Anchorage, Proceedings of the 11th fib International PhD Symposium in Civil Engineering, pp.485-492, 2016.
Liyanto EDDY, Anupam AWASTHI, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO: Mesoscopic Analysis of Different Expansion Causes in Concrete by 3D Rigid Body Spring Mode, Proceedings of 15th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2016. (in Conference USB)
Kohei NAGAI, Liyanto EDDY, Yi Yi Mon: Material Analysis of Fractured Bolts in Ayeyarwady Bridge (Yadanarbon), Myanmar, Proceedings of 15th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2016. (in Conference USB)
Hiroshi YOKOTA, Kohei NAGAI, Koji MATSUMOTO, Yi Yi Mon: Prospect for Implementation of Road Infrastructure Asset Management, Proceedings of the International Conference - Towards a Sustainable Urban Environment (EBUILT-2016), 2016.
Liyanto EDDY, Kohei NAGAI, Koji MATSUMOTO, Takeshi MIYASHITA, Win Bo: Report of Monitoring Results of Main Tower Inclination of Twantay Bridge in Myanmar, Proceedings of The Seventh International Conference on Science and Engineering (ICSE 2016), 2016.
Nunitkorn KITRATPORN, Wataru TAKEUCHI, Koji MATSUMOTO, Kohei NAGAI: 3D Structure-From-Motion Data Acquisition and Processing for Twantay Bridge Inclination Assessment, Proceedings of The Seventh International Conference on Science and Engineering (ICSE 2016), 2016.
Hirofumi YAMAGUCHI, Kohei NAGAI, Koji MATSUMOTO, Nobuhiro CHIJIWA: Effect of Water Supply on Pull-out Failure of Deformed Bars in Concrete and ECC under Fatigue Loading, Proceedings of the Fourteenth East Asia-Pacific Conference on Structural Engineering and Construction 14 (EASEC14), 2016. (in Conference CD)
松藤洋照,長井宏平,井林康:新潟県及び県下市町村管理橋梁の経年劣化傾向比較,土木学会第71回年次学術講演会,T,pp.179-180, 2016.
田中泰司,長井宏平:寒冷地域における橋梁定期点検結果を対象としたマルコフ連鎖モデルによる劣化予測の検討,土木学会第71回年次学術講演会,X,pp.883-884, 2016.
小黒蓮,井林康,長井宏平:橋梁定期点検調書における写真の撮り方および記載単語の基礎的傾向分析,土木学会第71回年次学術講演会,Y,pp.77-78, 2016.
坂田理子,長井宏平,金杉洋,井林康:橋梁点検データを活用した市町村橋梁の迂回路計算システムの開発,土木学会第71回年次学術講演会,Y,pp.89-90, 2016.
2015 Kohei NAGAI, Liyanto EDDY: A Proposal of Local Reinforcing Bar Arrangement in RC Beam Column Joint with Mechanical Anchorage by 3D RBSM, Proceedings of the Symposium on Reliability of Engineering Systems (SRES' 2015), 2015. (in Conference USB)
Punyawut JIRADILOK, Kohei NAGAI: Chloride Ion Penetration Simulation through Cracked Concrete based on Truss Network and RBSM, Proceedings of The 7th Asia-Pacific Young Researchers & Graduates Symposium, 2015.
Tao WANG, Koji MATSUMOTO and Kohei NAGAI: Simulations of the Pull-out performance of Mechanical Anchorages in Concrete with Damaged Cracks by the Discrete Analysis, Proceedings of 14th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2015. (in Conference USB)
2014 Ram Chandra NEUPANE, Kohei NAGAI, Liyanto EDDY: Governing Parameters of Various Strengthening Approaches Applied for RC Corbels Subjected to Local Failure Criterion, Proceedings of 1st International Conference on Infrastructure Failure and Consequences (ICIFC2014), SFC225, 2014. (in CD-ROM)
Tao WANG, Liyanto EDDY, Kohei NAGAI: Numerical Simulation of Failure of Beam-column Joint with Mechanical Anchorage by 3D Discrete Analysis, Proceedings of The 6th Asia-Pacific Young Researchers & Graduates Symposium, 2014.
Liyanto EDDY, Kohei NAGAI: Numerical Simulation of Failure of Beam Column Joint with Complex Reinforcement Arrangement by 3D Discrete Model, Proceedings of The 6th International Conference of Asian Concrete Federation (ACF2014), 2014.
Punyawut JIRADILOK, Kohei NAGAI: An Investigation on the Influence of Some Parameters in Simulation of Chloride Ion Penetration in Concrete Based on Truss Network Model, Proceedings of 13th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2014. (in Conference USB)
Shunya KIMURA, Kohei NAGAI, Yuya SAKAI: An Investigation of Element Size in a Numerical Simulation of Press-in Behavior by Discrete Analysis Method, 土木学会第69回年次学術講演会, pp.93-94, 2014.
Liyanto EDDY, Kohei NAGAI: Numerical Simulation of a Beam Column Joint with Complex Reinforcement Arrangement by 3D Discrete Model, 土木学会第69回年次学術講演会, pp.116-116, 2014.
2013 Umair BAIG, Kohei NAGAI: Effect of Self-Compacting Concrete and Aggregate Size on Anchorage Performance at Highly Congested Reinforcement Regions, World Academy of Science, Engineering and Technology, International Journal of Civil Engineering, Vol.7, No.9, pp.746-754, 2013.
Kohei NAGAI, Liyanto EDDY, Koichiro IKUTA: A Study of the Influence of the Bending Radius of Reinforcement Bar on the Failure Mechanism of L-shaped Beam Column Joint by 3D Discrete Model, Proceedings of 12th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2013. (in Conference USB)
Liyanto EDDY, Kohei NAGAI: A Study of the Behavior of a Beam Column Joint with Complex Arrangement of Reinforcing Bars by Finite Element Analysis, Proceedings of 12th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2013. (in Conference USB)
Koichiro IKUTA, Kohei NAGAI, Chikako FUJIYAMA: An Analytical Investigation of Influence of Bending Radius of Reinforcement on Failure Mechanism in L Beam-Column Joint by FEM, 土木学会第69回年次学術講演会, pp.101-102, 2013.

Ram Chandra NEUPANE, Kohei NAGAI: Non-linear FE Analysis of Reinforced Concrete Corbels Retrofitted with CFRP, 土木学会第69回年次学術講演会, pp.103-104, 2013.

Reiko KOJIMA, Yoshiyuki TAKANO, Kohei NAGAI: Application of Image Analyzing System to Shear Tests of HPFRCC Beams, 土木学会第69回年次学術講演会, pp.105-106, 2013.

Yoshiyuki TAKANO, Reiko KOJIMA, Kohei NAGAI: Shear Performance of Pre-damaged PVA-Aggregate Mixed ECC Beam, 土木学会第69回年次学術講演会, pp.125-126, 2013.

Baig UMAIR, Kohei NAGAI: Anchorage Performance of Reinforcement with Vulnerable Area at Highly Congested Reinforcement Region, 土木学会第69回年次学術講演会, pp.127-128, 2013.

Liyanto EDDY, Kohei NAGAI, Koichiro IKUTA: Mesoscale Simulation of Tension Stiffening Effect of Reinforced Concrete by 3D Discrete Model, 土木学会第69回年次学術講演会, pp.129-130, 2013.

2012 Kohei NAGAI, Koichiro IKUTA, Hisatoshi AI, Yu HIROI “A Survey on dependence on Mobile Shops for Shopping Needs in Hilly Rural Area” Social Capital and Development Trends in Rural Areas, Vol. 7, pp.305-310, 2012
Koichro IKUTA, Daisuke HAYASHI, Kohei NAGAI "Numerical Simulation of Beam-Column Joint with Simple Reinforcement Arrangement by Three-dimensional RBSM" Proceedings of 11th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2012
Yoshiyuki TAKANO, Benny SURYANTO, Kohei NAGAI "Shear Performance of PVA-Coarse Aggregate-ECC Beams Under a Rotating Stress Field" Proceedings of 11th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2012
Kohei NAGAI, Daisuke HAYASHI "An Analytical Investigation of Anchorage Performance of Mechanical Anchorage by 3D Discrete Model" Proceedings of The 4th Asia-Pacific Young Researchers & Graduates Symposium , 2012
Daisuke HAYASHI, Kohei NAGAI, Benny SURYANTO "Investigating the effects of reinforcement arrangement on the anchorage of reinforcement using the three-dimensional discrete analysis" Proceedings of the 4th Bond in Concrete Conference, pp.185-192, 2012
吉武謙二,小倉大季,小川晃,長井宏平,林大輔 "柱梁接合部の構造性能に及ぼす梁主鉄筋の曲げ内半径および寸法効果の影響" 土木学会第67回年次学術講演会, pp.501-502, 2012
Daisuke HAYASHI, Kohei NAGAI "THREE-DIMENSIONAL SIMULATION OF CRACK FORMATION AT ANCHORAGE ZONE WITH MECHANICAL ANCHORAGE" 土木学会第67回年次学術講演会, pp.135-136, 2012
Koichro IKUTA, Kohei NAGAI "Three-Dimensional Analysis of Flow of Fresh Concrete as Two Phase Model by MPS" 土木学会第67回年次学術講演会, pp.147-148, 2012
Yoshiyuki TAKANO, Benny SURYANTO, Kohei NAGAI "Shear Performance of PVA-ECC Beams that Mixed with Coarse Aggregate" 土木学会第67回年次学術講演会, pp.155-156, 2012
2011 Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA: Effects of Shear Transfer on the Directions of Principal Strain Field in Cracked Concrete with Hooked Steel Fibers, Proceedings of the High Performance Fiber Reinforced Cement Composites - HPFRCC 6, pp.296-236, 2011
林大輔,井上友,長井宏平: 3次元離散解析による定着法と構成材料の定着部破壊性状への影響の検討, コンクリートと補強材の付着挙動と付着構成則に関するシンポジウム論文集, pp309-319, 2011.
Koichi MAEKAWA, Kohei NAGAI, Benny SURYANTO: Impacts of Principal Stress Rotation on the Nonlinearity of Strain-hardening Cementitious Composites with Fibers, Proceedings of Second Rilem International Conference on Strain Hardening Cementitious Composites, 2011. (in CD-ROM)
Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA, Tetsushi KANDA: Control of Cracking Direction of SHCC under Principal Stress Rotation with Coarse Aggregate, Proceedings of Second Rilem International Conference on Strain Hardening Cementitious Composites, 2011. (in CD-ROM)

Daisuke HAHASHI, Kohei NAGAI, Yu INOUE: Three-dimensional Analysis of Anchorage Failure of RC by Discrete Analysis Method Proceedings of International Conference on Recent Advances in Nonlinear Models CoRAN2011, 2011. (in CD-ROM)

尾川七瀬,山根崇史,石原行博,白石琢真,長井宏平: 模型地盤を用いた圧入の基礎実験 ―実験装置の概要と模型地盤の作製手順―, 土木学会四国支部技術研究発表会 講演集, 2011. (in CD-ROM)
白石琢磨,長井宏平,内村太郎,石原行博,尾川七瀬: 傾斜計センサーによる砂層への杭圧入時の地盤内変形の計測, 第46 回地盤工学研究発表会, 2011. (in CD-ROM)
尾川七瀬,山根崇史,石原行博,白石琢真,長井宏平: 圧入中の杭の周面抵抗に関する基礎的模型実験, 第46 回地盤工学研究発表会, 2011. (in CD-ROM)

長井宏平,鈴木直樹,白石琢磨,内村太郎,石原行博,尾川七瀬: 模型多層地盤への杭貫入時の地盤内変形の計測, 土木学会第66回年次学術講演会, pp.477-478, 2011.

尾川七瀬,山根崇史,石原行博,白石琢真,長井宏平: 杭圧入中の地盤の変形に関する基礎的模型実験, 土木学会第66回年次学術講演会, pp.309-310, 2011.

生田浩一郎,長井宏平,廣井悠,金森亮: 中山間地域における高齢者の買い物時のついで移動に関する研究, 農村計画学会春期大会学術研究発表会要旨集, pp.22-23, 2011.

Yu INOUE, Kohei NAGAI: Numerical Simulation of Fracture Pattern and Bond Performance of Anchorage in Reinforced Concrete, Proceedings of the Twelfth East Asia-Pacific Conference on Structural Engineering and Construction 12 (EASEC12), 2011. (in CD-ROM)

Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA: Role of Coarse Aggregate in a Cement-based Material with Strain-hardening Subjected to Stress-field Rotation, Proceedings of 10th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2011. (in Conference CD)

2010 Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA "Crack-shear Transfer and Its Effects on the Rotation of Stress and Strain Fields in ECC,” Proceeding of the Fourth Asian Concrete Federation International Conference, Taipei, Taiwan, November, 2010, Compendium Papers of CD ROM, Paper No. S5.3-03.
Dalimunthe MAHYARUDIN, Kohei NAGAI, Benny SURYANTO "Tension Stiffening Characteristics of Reinforced Strain Hardening Cement Composite (R/SHCC), " Proceeding of the Fourth Asian Concrete Federation International Conference, Taipei, Taiwan, November, 2010, Compendium Papers of CD ROM, Paper No. S5.3-04.
Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA "Numerical Simulation of Damaged HPFRCC Plates with Multi-directional Cracking" Proceedings of the 2nd International Conference on Durability of Concrete Structures ICDCS2010, pp.653-662, 2010
生田浩一郎,長井宏平,金森亮,佃悠 "中山間地域住民の居住継続意思と生活満足度の関連性" 第42回土木計画学研究講演集, Vol. 42, 2010 (in CD-ROM)

井上友, 大胡賢一, 長井宏平 “機械式定着のひずみ進展に与える付着損傷の影響の模擬実験による検討” 土木学会第65回年次学術講演会, pp1119-1120, 2010

大胡賢一, 長井宏平, 井上友 “コンクリート施工不良時における機械式定着具の定着性能”土木学会第65回年次学術講演会, pp.1121-1122, 2010

家辺麻里子, 長井宏平, 廣井悠 “中山間地域住民の道路安全性の認識に関する調査研究” 土木学会第65回年次学術講演会, pp159-160, 2010

Haruka TSUKUDA, Kohei NAGAI and Naofumi SUZUKI “The Living Environment In A Depopulating Mountainous Village :A Case of Niyodogawa-cho, Kochi, Japan” Proceedings of International Workshop on Sustainable City-region (The Alliance for Global Sustainability), pp.101-105, 2010

長井宏平,家辺麻里子,金森亮 “中山間地域住民の年齢層別道路利用頻度に関する研究” 農村計画学会 春期大会学術研究発表会 要旨集, pp7-8, 2010

2009

Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Flexural Fatigue Tests on Anisotropic Fiber Reinforced Concrete Plates with Bidirectional Cracking” International Symposium on Fatigue and Fracture 2009, Philadelphia, US, 2009

大胡賢一,長井宏平,酒井雄也 “鉄筋間を通過するフレッシュコンクリートの基礎挙動と応力伝達メカニズム” 土木学会第64回年次学術講演会, pp.625-626, 2009

内村太郎,田實渉,前川宏一,長井宏平,酒井雄也 “矢板の圧入が地中構造物と埋設管に及ぼす土圧の変化 その1” 第44 回地盤工学研究発表会, pp.1325-1326, 2009

内村太郎,田實渉,前川宏一,長井宏平,酒井雄也 “矢板の圧入が地中構造物と埋設管に及ぼす土圧の変化 その2” 第44 回地盤工学研究発表会, pp.1327-1328, 2009

2008

Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA “Spatially Averaged Constitutive Model of HPFRCC with Multi- directional Cracking” Proceeding of the Eleventh East Asia-Pacific Conference on Structural Engineering and Construction (EASEC11)

Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA  “Numerical Analysis of Secondary Rotated Cracking Behavior of Fiber Reinforced Cementitious Composite Plate ”  Proceedings of 8th International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8)

Kohei NAGAI, Koichi MAEKAWA  “Mesoscopic Failure Simulation of Concrete and Life-cycle Computation of Concrete Structures”  Proceeding of 6th International Conference on Computation of Shell & Spatial Structures (IASS IACM 2008)

Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA  “Influence of Damage on Cracking Behavior of Ductile Fiber Reinforced Cementitious Composite (DFRCC)”  Proceedings of 8th International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8)

Koichi MAEKAWA, Kohei NAGAI “Safety Assessment of Structural Concrete with Defects and Damages” Proceeding of 7th International Symposium on New Technology for Urban Safety of Mega Cities in Asia

酒井雄也,長井宏平,前川宏一  "砂礫地盤における礫の力学相互作用解明のための基礎実験" 第43回地盤工学研究発表会,2008, pp.1307-1308.

酒井雄也,長井宏平,前川宏一“礫の構造体形成が杭貫入抵抗に与える影響”土木学会第63回年次学術講演会,2008, pp.223-224.

2005

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Mesoscopic Simulation of Failure of Concrete under Biaxial Compression Stress” 土木学会北海道支部論文報告集, 2005, Vol.61, V-34.

2004 Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Comparison of 2D and 3D RBSM Analyses of Mortar and Concrete on Meso Scale” 土木学会第59回年次学術講演会講演概要集, 2004, pp.765-766.
2003

Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Numerical Simulation of Compression and Tension Failure of Mortar by 3D Rigid Body Spring Analysis” Proceeding of the Ninth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC9), 2003, Computational Mechanics, pp.63-68.

2002 Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA “Numerical Simulation of Fracture Process of Plane Concrete by Rigid Body Spring Method” Proceeding of the first fib Congress 2002 Concrete Structures in the 21st Century, 2002, Vol.8, pp.99-106.
Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA “Numerical Analysis of Meso-scopic Failure Process in Concrete Model” 土木学会北海道支部論文報告集, 2002, Vol.58, pp.790-793.
2001

長井宏平,佐藤靖彦,上田多門 コンクリート内部破壊過程の準微視的数値解析 土木学会北海道支部論文報告集, 2001, Vol.57, pp.802-803.

Muttaqin HASAN, Tamon UEDA, Yasuhiko SATO, Kouhei NAGAI “Experimental Study on Tension and Compression Behavior of Plain Concrete after Freezing and Thawing Exposure” 土木学会北海道支部論文報告集, 2001, Vol.57, pp.808-811.
2000

長井宏平,佐藤靖彦,上田多門  “炭素繊維シートにより補強された部材のじん性率に与える帯筋の影響  「耐震補強の評価に関する研究委員会」報告書・論文集, 2000, pp.481-488.

長井宏平,佐藤靖彦,上田多門,木村勉  “炭素繊維シートによる橋脚補強  土木学会北海道支部論文報告集(TXY部門), 2000, Vol.56(A), pp.620-623.


雑誌記事 (Articles)
2016 長井宏平:国際会議EASECにてSIP特別セッションを開催,橋梁と基礎,2016年3月号.
横田弘,長井宏平:インフラ維持管理・更新・マネジメント技術の海外展開プロジェ クト -戦略的イノベーション創造プログラム(SIP)-,プレストレストコンクリート, Vol.58, No.6, pp.25-30, Nov. 2016.
2015

長井宏平:ポスト2020年に向けて学が果たす役割,コンクリート工学,2015年1月号.

2014

丸屋剛,下村匠,石田哲也,岩波光保,長井宏平: 土木学会「2012年制定コンクリー ト標準示方書[設計編] 」の塩害照査に関する改訂資料,コンクリート工学,2014年6 月号.

2011

長井宏平:EASEC-12参加報告,コンクリート工学,2011年8月号.


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