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OKUI Yoshiaki

Faculty: Graduate School of Science and Engineering TEL: +81-48-858-3558
Position: Professor  Director in General ■FAX: +81-48-858-3558
Address: 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan ■Mail Address: okui@mail.saitama-u.ac.jp
■Web site: http://smdg.civil.saitama-u.ac.jp/okui_j.html

Profile

Assigned Class

Faculty of Engineering
International Institute for Resilient Society

Research Field

Applied mechanics
Structural mechanics
Bridge engineering
Micromechanics
keyword:bridge , rubber , rock , design

Current Subject

Design method for steel and composite structures
Research on safety factors for structural design
Mechanical model of laminated rubber bearings for seismic design
Redundancy and vulnerability assessment of steel structures for bridge maintenance
Development of super long-term deterioration prediction models for crystalline rocks

Academic Societies

Academic Societies
Japan Society of Civil Engineers
Japanese Society of Steel Construction
Japanese Geotechnical Society
IABSE

Academic Background

Degree
Dr. Eng. , Univ. of Tokyo , A Micromechanics-Based Continuum Theory for Localization Phenomena
Mr. Eng. , Saitama Univ.

Awards

2020
2018
2011 , JSCE Tanak prize, Best paper
2011 , Best paper, Japan Society of Civil Engnners
2010 , JSCE Tanaka prize: best paper
2007 , JSCE Tanaka prize: best paper

Research Career

Research Career
2009 , Professor
1996 - 1997 , Visiting researcher, Delft university
1993 - 2009 , Associate professor
1989 - 1993 , Research associate
Other Career
1985 - 1989 , Kawasaki Heavy Industry

Research

Books, Articles, etc.

Books
Handbook of International Bridge Engineering
CRC Press:1037-1086 201310
ISBN:978-1-4398-1029-3
Masatsugu Nagai, Yoshiaki Okui, Yutaka Kawai, Masaki Yamamoto, Kimio Saito

A micromechanics-based continuum theory for microcracking localization of rocks under compression
John Wiley & Sons,Continuum models for materials with microstructure:27-68
ISBN:0 471 95065 3
Okui, Y. and Horii, H.

Articles
鋼橋のシステムリダンダンシーの評価方法とLoad ratingにおけるシステム係数の提案
,構造工学論文集 A,68A:1-10 2022
奥井 義昭, 傳田 諒, 熊木 和輝, 佐久間 智

Load Ratingを用いた既設橋梁の耐荷性能評価に関する一検討
,土木学会論文集A1(構造・地震工学),77(3):418-426 2021
笠松 徹, 奥井 義昭, 石橋 正博, 山川 創

鋼道路橋のLoad Ratingの検討
,橋梁と基礎 ,55(2):23-26 2021
奥井 義昭,宮下  剛

縦横比が大きい単リブ補剛板の限界圧縮強度評価
,土木学会論文集A1(構造・地震工学),76(1):67‐81 2020
宮嵜 靖大,Mahmudur RAHMAN,奥井 義昭

Probabilistic compressive strength of stiffened steel plates exhibiting column-like behavior: ultimate and serviceability limit states
,J. of Struct. Eng.,146(9):04020166-1 -04020166-15 2020
Mahmudur Rahman, Yoshiaki Okui, Masato Komuro, Muhammad Atif Anwer, Azusa Numata

Seismic response of isolated bridge with high damping rubber bearings: Self-heating effect at subzero temperatures
,Steel Construction,12(1):2-9 2019
Okui, Y. , Nakamura, K. , Sato, T. and Imai, T.

SM570を使用したコンクリート充填鋼製橋脚の 地震時変形性能に関する実験的研究
,構造工学論文集,64A:222-230 2018
神田信也,松原拓朗,田嶋仁志,奥井義昭,志治謙一,岡田誠司

Probabilistic strength at serviceability limit state for normal and SBHS slender stiffened plates under uniaxial compressi
,International Journal of Steel Structures,Vol.18, No.4:1397-1409 2018
Mahmudur Rahman, Yoshiaki Okui, Muhammad Atif Anwer

Probabilistic column-like buckling strength for stiffened steel plates under uniaxial compression
,Proc. of JSCE 20th Int'l Summer Symposium, Hokkaido, Japan:3-4 2018
Rahman, M., Okui, Y. and Komuro, M.

Reliability Based Design for Buckling Strength of Stiffened Steel Plates: Ultimate and Serviceability Limit States
,Proc. of 11th ADB-JSP Research Forum, Tokyo, Japan 2018
Rahman, M. and Okui, Y.

An Experimental Study on Seismic Performance of Concrete-Filled Steel Piers
,Proc. of 40th IABSE Symposium:S23-125-132 2018
Shinya Kanda, Takuro Matsubara, Hitoshi Tajima, Yoshiaki Okui, Kenichi Shiji, Seiji Okada

自己発熱の影響を考慮した高減衰ゴム支承の温度依存特性
,木学会論文集A1(構造・地震工学),73(1):165-173 2017
奥井義昭, 尾上修浩, 佐藤京, 今井 隆

Probabilistic ultimate buckling strength of stiffened plates, considering thick and high-performance steel
,J. of Constructional Steel Research,138:184-195 2017
Rahman, M., Okui, Y., Shoji, T., Komuro, M.

Nonlinear Viscosity Law in Finite-Element Analysis of High Damping Rubber Bearings and Expansion Joints
,J. Eng. Mech., ASCE,Vol.141, No.6:04014169-1-11 2015
A. F. M. S. Amin, A. R. Bhuiyan, T. Hossain, and Y. Okui,

An improved rheology model for the description of the rate-dependent cyclic behavior of high damping rubber bearings,
,Soil Dynamics and Earthquake Engineering,Volume 77:416-431 2015
D.A. Nguyen, J. Dang, Y. Okui, A.F.M.S. Amin, S. Okada, T. Imai,

実橋箱断面圧縮部材の耐荷力特性と基準耐荷力曲線に関する検討
,構造工学論文集,Vol.61A:35-48 2015
野上邦栄, 竹内幸治, 山下洋平, 岸 祐介, 長井正嗣, 奥井義昭, 野阪克義, 小室雅人, 宮下剛

Nonlinear Viscosity Law in Finite-Element Analysis of High Damping Rubber Bearings and Expansion Joints
,J. Eng. Mech., ASCE:04014169-1-11 2014
A. F. M. S. Amin, A. R. Bhuiyan, T. Hossain, and Y. Okui

Probabilistic local buckling strength analysis of compressive plates for normal and bridge high performance steels
,IABSE Madrid Symposium Report,102:1157-1163 2014
Okui, Y., Komuro, M., Duc D.V.

Probabilistic distributions of plate buckling strength for normal and bridge high-performance steels
,International Journal of Steel Structures,13(3):557-567 2013
Dang Viet Duc, Yoshiaki Okui, Koichi Hagiwara, Masatsugu Nagai

Low temperature behavior and modeling of high damping rubber bearings
,Proc. of International Symposium on New Technologies for Urban Safety of Mega Cities in Asia,Paper id 4-067:1-8 2013
Tomoya MATSUMOTO, Yoshiaki OKUI, Dung Anh NGUYEN, Md. Shafquat HASAN, Kaho TAKAHASHI, Hiroshi MITAMURA, Takashi IMAI

Mechanical behavior of high damping rubber bearings at low temperatures
,Proc. of International Symposium on New Technologies for Urban Safety of Mega Cities in Asia,Paper id 2-150:1-8 2013
Dung Anh NGUYEN, Yoshiaki OKUI, Md. Shafquat HASAN, Hiroshi MITAMURA, Takashi IMAI

Application of Rheology Modeling to Natural Rubber and Lead Rubber Bearings: A Simplified Model and Low Temperature Behavior
,Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)),68(3):526-541 2012
Muhammad Kashif RAZZAQ, Yoshiaki OKUI, Abdur Rahman BHUIYAN, A. F. M. Saiful AMIN, Hiroshi MITAMURA, Takashi IMAI
A rheology originally proposed for high damping rubber bearing (HDRB) is applied to natural rubber bearing (RB) and lead rubber bearing (LRB) along with its simplified form. Comparing HDRB, the elastic-plastic equilibrium responses were found to be more dominant than the rate-dependent response due to viscosity for RB and LRB. Moreover, the overstress in loading/unloading was found to be analogous. The dependency of nonlinear viscosity on current strain was found to be weak in contrast to the existence of considerable nonlinearity in elastic response. The original rheology model considers the nonlinear elasto-plastic and viscosity induced rate-dependent behavior into account, while the viscosity effect is eliminated in the simplified version. The models are implemented in a finite element code. The modeling effects of bearings on the seismic responses of a multi-span continuous highway bridge are investigated via nonlinear dynamic analyses for two strong earthquake ground motions. Three analytical models of isolation bearings are considered for comparison: the conventional design models and the proposed two models. Model parameters for the bearings were determined for two temperature conditions: the room temperature (+23 $ ^{¥circ} $C) and the low temperature ($-20 ^{¥circ} $C) based on experimental data. The implication of the rheology models for response prediction of a prototype bridge is studied by comparing the rotation of a plastic hinge in pier and shear strain at the top of the bearing. The comparison suggests that the modeling of RB and LRB considering rheology properties is important for rational prediction of the seismic response of highway bridges, particularly at low temperature condition.

Design, construction and maintenance of steel and steel-concrete hybrid bridges in Japan
,Festschrift Gerhard Hanswille, Institut f:ur Konstruktven Ingenieurbau, Bergische Universit:at Wuppertal,Heft 20:293-302 2011
Nagai, M., Okui, Y., Miyashita, T.,

Bending Moment Capacity and Combined Strength under Bending Moment and Shear for Composite Girders
,Proc. of the 6th International Symposium on Steel Structures:941-947 2011
Duc, D.V. Okui, Y., Nagai, M., Inaba, N. Homma, A.

Experimental Study of Rate-Dependent Mechanical Behavior of Laminated Rubber Bearings
7th CUEE and 5th ICEE Joint Conference,Joint Conf. Proc. of 7th Int. Conf. on Urban Earthquake Eng. & 5th Int. Conf. on Earthquake Eng.:1921-1928 2010
T.Imai, A.R.Bhuiyan, M.K.Razzaq, Y.Okui, H.Mitamura

A rheology model of high damping rubber bearings for seismic analysis: Identification of nonlinear viscosity
,International Journal of Solids and Structures,46(7/8):1778-1792 200904
A. R. Bhuiyan;Y. Okui;H. Mitamura;T. Imai

A case study for after fracture redundancy analysis of a turss bridge in Japan
,Proc. of Australia-Japan workshop on steel and composite structures:87-92 2009
ISBN:ISBN 978-1-74108-199-2
Yoshiaki Okui, Hideki Nagatani, Naomitsu Akashi, Takenori Matsuda, Masahiro Yasuda, Hironori Ishii, Masayuki Miyamori, Yasuhiro Obata, Hiroshi Hirayama
Truss bridge, After fracture redundancy, Load carrying capacity

A rheology model of high damping rubber bearings for seismic analysis: Identification of nonlinear viscosity
Elsevier,International Journal of Solids and Structures,46(7-8):1778-1792 2009
A.R.Bhuiyan, Y.Okui, H.Mitamura, T.Imai

Development of Rheology model for RBs and LRBs and its implementation in seismic analysis
,Proc. of 11th International summer symposium conference organized by Japan Society of Civil Engineers:21-24 2009
Razzaq, M.K., Bhuiyan, A.R., Okui, Y., Mitamura, H., Imai,T.

Effect of Rubber Bearing's Modeling on Seismic Response of Base Isolated Highway Bridge
7th CUEE and 5th ICEE Joint Conference,Joint Conf. Proc. of 7th Int. Conf. on Urban Earthquake Eng. & 5th Int. Conf. on Earthquake Eng.:1855-1862 2009
M.K.Razzaq, A.R.Bhuiyan, Y.Okui, H.Mitamura, and T.Imai

Elasto-plastic behavior and ultimate strength of 200-meters cable-stayed composite girder bridge with low tower
2009
Shintarou Io, Kuniei Nogami, Yoshiaki Okui, Yasuyuki Morizono

Elasto-plastic behavior and ultimate strength of 200-meters cable-stayed composite girder bridge with low tower
,Proc. of the 10th Japan-Korea joint Symposium on steel bridges,10 2009
S.Io, K.Nogami, Y.Okui, K.Morizono

Recent topics of Japanese design codes for steel and composite bridges
,Proceedings of the 10th Korea-China-Japan Symposium on Structural Steel Construction:9-14 2009
Okui, Y.

A design method of continuous composite girders under negative bending moment against restrained distortional buckling
,Eleventh East Asia-Pacific Conference on Structural Engineering & Construction (EASEC-11) "Building a sustainable environment":1-7 2008
Okui, Y., Bandula Heva T.M., Komuro, M., Nagai, M.,

Revisit of section classification requirements for composite girders under positive flexure
ECCS European Convention for Construction Steelwork,Eurosteel 2008: 5th European Conference on Steel and Composite Structures, Ofner, R., Beg, D., Dink, J., Greiner, R., Unterweger H., (eds.),A:381-386 2008
ISBN:ISBN 92-0147-000-90
Okui, Y., Gupta, V.K., Nagai, M.,

Numerical simulation of the excavation damaged zone around an opening in brittle rock
,International Journal of Rock Mechanics and Mining Sciences,44(6):835-845 200709
A. Golshani;M. Oda;Y. Okui;T. Takemura;E. Munkhtogo

Block FEM for time-dependent shear-lag behavior in two I-girder composite bridges
,Journal of Bridge Engineering,12(1):72-79 200701
Y. Okui;M. Nagai

Design issues for steel-concrete composite girders
,Proc. of China-Japan Joint Seminar on Steel and Composite Bridges:85-93 2007
Okui, Y

Effect of concrete crushing of flexural strength of steel-concrete composite girders
土木学会,土木学会論文集A,63(3):475-485 2007
Gupta, V.K., Okui, Y., Inaba, N. , Nagai, M.

Experimental Study on Shear Strength of Lying Stud in Double-Composite Girder Bridges
,Proc. of The 7th German-Japanese Bridge Symposium 2007
Nagai, M., Okui, Y., Miyashita, T., Iwasaki, E., Ikariyama H., Kenichi ISHIKAWA and Shigeyuki HIRAYAMA

Experimental study on ultimate strength of composite and double-composite girders
,Proc. of 8th Pacific Structural Steel Conference,2:329-334 2007
Nagai, M., Inaba, N. , Tomita, Y., Okui, Y.

Nonlinear viscosity law for rate-dependent response of high damping rubber: EF implementation and verification
,Proc. of the 5th European Conference on Constitutive Models for Rubber, ECCMR:279-284 2007
Bhuiyan, A.R., Amin, A. , Hossan, T., Okui, Y.

Web Slenderness Limit for Section Classification of Unshored Composite Girders
,Proc. of The 7th German-Japanese Bridge Symposium 2007
Okui, Y., Gupta, V.K., Nagai, M.

Nonlinear dependence of viscosity in modeling the rate-dependent response of natural and high damping rubbers in compression and shear: Experimental identification and numerical verification
PERGAMON-ELSEVIER SCIENCE LTD,International Journal of Plasticity,22(9):1610-1657 200612
奥井 義昭

Numerical simulation of an excavation disturbed zonearound a tunnel in brittle rock<速報>
埼玉大学工学部,埼玉大学紀要, 工学部, 第1部論文集,39:110-113 200607
小田 匡寛奥井 義昭

A micromechanical model for brittle failure of rock and its relation to crack growth observed in triaxial compression tests of granite
,Mechanics of Materials,38(4):287-303 200604
A. Golshani;Y. Okui;M. Oda;T. Takemura

Hyperelasticity model for finite element analysis of natural and high damping rubbers in compression and shear
,Journal of Engineering Mechanics-Asce,132(1):54-64 200601
A. F. M. S. Amin;S. I. Wiraguna;A. R. Bhuiyan;Y. Okui

Development of web slenderness limits for composite I-girders accounting for initial bending moment
,Doboku Gakkai Ronbunshuu A,62(4):854-864 2006
Gupta, V.K., Okui, Y., Nagai, M.

Effect of Initial Bending Moment in Composite Girder under Flexure for Unshored Construction
,7th Int. Conf. on Short & Medium Span Bridges:ID-047-1-8 2006
Gupta, V.K., Okui, Y., Nagai, M.

FE Analysis with Smeared Crack Model for Crack Width Evaluation in Continuous Composite Girders
,7th Int. Conf. on Short & Medium Span Bridges:ID-034-1-7 2006
Okui, Y., Honda, Y., Khan, Q.Z., Nagai M.

Nonlinear dependence of viscosity in modeling the rate-dependent response of natural and high damping rubbers in compression and shear: Experimental identification and numerical verification
,International Journal of Plasticity,22(9):1610-1657 2006
A. F. M. S. Amin;A. Lion;S. Sekita;Y. Okui

Ultimate Strength of Composite I-Girder in Pure Positive Bending
,7th Int. Conf. on Short & Medium Span Bridges:ID-030-1-10 2006
Nagai, M., Okui, Y., Inaba, N.

Analytical study on steel-concrete composite girders
,Proc. of Japan-Bangladesh Joint Seminar on Advances in Bridge Engineering, Dhaka, Bangladesh:113-124 2005
Okui Y.,

Hydraulic behaviour of Inada granite in the excavation disturbed zone around underground openings
,Proceedings of the Seventh International Summer Symposium, JSCE, Tokyo :153-156 2005
Golshani, A., Okui, Y., Oda, M., Takemura, T.

Load-carrying capacity of composite girders in cable-stayed bridges
,4th European conference on steel and composite structures, Eurosteel 2005, Maastricht, Netherlands:4.6.7-12 2005
Okui Y., Nagai M., Iwasaki E. and Hirono T.

Proceedings of the Japan-Bangladesh Joint SEminar on Advances in Bridges Eng.
,The instituton of Engineers, Bangladsh:168 2005
Amin, A.F.M.S, Okui, Y., Safiullah, A.M.M editors

Simplified expressions for determining neutral axis depth in composite girders under positive bending
,Proceedings of the Seventh International Summer Symposium, JSCE, Tokyo:53-56 2005
Gupta V.K., Okui Y. and Nagai M.

Simulation of Damage around a Circular Opening in Rock
,The 11th International Conference of IACMAG, Turin, Italy:33-40 2005
Golshani A., Okui Y., and Oda M.

Some topics of studies for steel-concrete composite girders
,Proc. of 8th Korea-China-Japan Symposium on steel structure, Seoul 2005
Okui Y. and Gupta V.K.

Ultimate behavior and strength of composite girder under flexure - Proposition of innovative design method
,4th European conference on steel and composite structures, Eurosteel 2005, Maastricht, Netherlands:4.3.91-98 2005
Nagai M., Gupta V.K., Okui Y., Yasukawa Y. and Inaba N.

Ultimate strength of composite I-girder under pure sagging bending moment
,The First International Road and Traffic Conference (ITRC), Proceedings -Roads to Global Society, Seoul, South Korea:337-348 2005
Nagai M., Okui Y., Gupta V.K. and Inaba N.

Fragility analysis of a bridge substructure under Level-1 earthquake and its application to determination of safety factors
,J. Struct. Eng., JSCE,50A:257-268 2004
Hoque, M., Seshimo, Y.(Tokyo Electric power Service), Tunekuni, M., Okui, Y. and Sugiyama(Yamanashi University), T.,

High Damping Rubber for Base Isolation Bearing: Mechanical Behavior and Constitutive Modeling
,Filler Reinforcement of Rubbr:51-57 2004
Amin, A.F.M.S.(Bangladesh University of Engineering & Technology) and Okui, Y.

Time dependent continuous damage model for brittle failure of rocks
,EUROCK 2004 & 53rd Geomechanics Colloquium, Schubert (ed.):701-706 2004
Golshani, A., Okui, Y., Takemura, T., Oda

高架橋の動的非線形解析における感度分析と部分構造モデルの妥当性の検討
土木学会,構造工学論文集,50A:1419-1426 2004
奥井義昭

合成斜張橋主桁の終局挙動の解明と安定照査法
土木学会,構造工学論文集,50A:53-59 2004
長井正嗣(長岡技術科学大学), 奥井義昭, 野上邦栄(東京都立大学), 廣野智紀

連続合成桁の初期ひび割れ状態を考慮したひび割れ幅, 鉄筋応力算定法の一提案
土木学会,土木学会論文集,I-67759:283-292 2004
長井正嗣(長岡技術科学大学), 奥井義昭, 岩崎英治

An improved hyperelasticity relation in modeling viscoelasticity response of natural and high damping rubbers in compression: experiments, parameter identification and numerical verification
,Mechanics of Materials,34(2):75-95 2002
A.F.M.S. Amin, M.S. Alarm, Y. Okui,

Application of Micromechanics to Modeling Compressive Failure of Rock
,Material Science Research International,6(2):65-73 2000

合成箱桁を主桁とする斜張橋の力学特性と適用スパンに関する研究
土木学会,構造工学論文集,44A:1171-1179 1998

Stress and Time-Dependent Failure of Brittle Rocks under Compression:a Theoretical Predection
,Journal of Geophysical Research,102(B7):14869-14881 1997

A Continuum Theory for Solids Containing Microdefects
,International Journal of Engineering Science,31(5):735-749 1993

Presentation
Proc. of IABSE-JSCE Conference on Advances in Bridge Engineering-IV
IABSE-JSCE Conference on Advances in Bridge Engineering-IV,Proc. of IABSE-JSCE Conference on Advances in Bridge Engineering-IV 202008
M. Rahman, Okui, Y., Anwer, A.

Load ratingによる既設橋の耐力評価:新旧示方書とJSCE標準示方書の比較
土木学会年次学術講演会,年次学術講演会講演概要集,73: I-064 201809
傳田 諒,庄司 峻弘,奥井 義昭,石橋 正博,笠松 徹

PROBABILISTIC COLUMN-LIKE BUCKLING STRENGTH FOR STIFFENED STEEL PLATES UNDER UNIAXIAL COMPRESSION
土木学会年次学術講演会,年次学術講演会講演概要集,73:CS2-002 201809
ラーマン マフムダ,ラーマン マフムダ,奥井 義昭,小室 雅人

Seismic response of isolated bridge with high damping rubber bearings: self-heating effect under subzero temperatures
12th - Japanese-German Bridge Symposium, Munich, Germany,Proc. of 12th - Japanese-German Bridge Symposium 201809
Yoshiaki Okui, Keisuke Nakamura, Takashi Sato, and Takashi Imai

A Numerical Investigation on Probabilistic Information of Ultimate Buckling Strength of Stiffened Plates with Bridge High Performance Steel
11th German-Japan Bridge Symposium 201609
Rahman, M.

After-fracture redundancy analysis for bridge maintenance
韓・日 道路橋維持管理セミナー:141-151 201312
奥井義昭

Influence of SBHS500 on section classification criterion for composite girders
土木学会年次学術講演会,土木学会年次学術講演会講演概要集,66:CS2-015, pp29-30 201209
Duc, D.V. Okui, Y., Tonegawa, T., Kamijo, T., Matsuno, M.

Seismic design of base isolated multi-span highway bridge: effect of isolation bearing’s modeling on seismic response
2nd Canbodia-Japan Joint Seminar on Bridge Engineering,Proc. of the 2nd Canbodia-Japan Joint Seminar on Bridge Engineering:51-57 201203
Razzaq M.K., Bhuiyan, A.R., Okui, Y., Mitamura, H., Imai, T.

Effect of Isolation Bearing’s Modeling on Seismic Response Prediction of Base Isolated Multi-Span Highway Bridge
Canadian society for civil engineering,3rd International Structural Specialty Conference, CSCE, Edmonton, Alberta:STR-1004-1-10 2012
M. K. Razzaq, Y. Okui, H. Mitamura, T. Imai

Seismic Response Prediction of Base Isolated Multi-Span Highway Bridge With Different Modeling Techniques for Lead Rubber Bearings
International Association for Bridge and Structural Engineering,18TH CONGRESS OF IABSE, SEOUL:A-0058 2012
M. K. Razzaq, Y. Okui, H. Mitamura, T. Imai

Local Buckling Strength And Its Statistical Information of Normal and Bridge High Performance Steel Plates
International Association for Bridge and Structural Engineering,18TH CONGRESS OF IABSE, SEOUL:A-0132 2012
Viet Duc DANG, Yoshiaki OKUI, Koichi HAGIWARA, Masatsugu NAGAI

初期不整と残留応力のばらつきとSBHS鋼材を考慮した板の局部座屈強度に関する研究
土木学会,平成24年度土木学会全国大会 第67回年次学術講演会概要集:I-014 2012
萩原 光一, 奥井 義昭, Dang Viet Duc

ゴム支承の温度依存性に関する研究とMullins効果のモデル化の検討
土木学会,平成24年度土木学会全国大会 第67回年次学術講演会概要集:I-397 2012
石島 慎也, 奥井 義昭, Nguyen Anh Dung, 今井 隆, 三田村 浩

DESIGN OF COMPOSITE STRUCTURES: BENDING MOMENT AND SHEAR FORCE CAPACITY OF COMPOSITE GIRDERS
Canbodia-Japan Joint Seminar on Bridge Engineering,Proc. of Canbodia-Japan Joint Seminar on Bridge Engineering 201103
Okui, Y., Nagai, M.

Ultimate flexure strength and shear strength of double-composite I-girders under hogging bending moment
IABSE,Proc. of Joint IABSE-fib Conference,1:607-614 2010
Inaba, N., Okui, Y., Nagai, M., Homma, A., Kasugai, T., Noro, T,

Recent topics of Japanese design codes for steel and composite bridges
the 10th Korea-China-Japan Symposium on Structural Steel Construction,Proceedings of the 10th Korea-China-Japan Symposium on Structural Steel Construction:9-14 200911
Okui, Y

A Simplified Rheology Model of Natural and Lead Rubber Bearings for Seismic Analysis
土木学会,土木学会第64回年次学術講演会,1-384 2009
ブイヤン=ラーマン, ラザック=モハンマドカシフ,奥井義昭,三田村浩

Development of Rheology model for RBs and LRBs and its implementation in seismic analysis
11th International summer symposium conference organized by Japan Society of Civil Engineers,Proc. of 11th International summer symposium conference organized by Japan Society of Civil Engineers (JSCE):21-24 2009
Razzaq, M.K., Bhuiyan, A.R., Okui, Y., Mitamura, H., Imai,T.,

Seismic response analysis of base isolated highway bridge:effect of isolation bearing's modeling
土木学会,土木学会第64回年次学術講演会,1-385 2009
ラザック=モハンマドカシフ,ブイヤン=ラーマン,本橋竜太,奥井義昭,三田村浩

Experimental investigation of laminated rubber bearings and their modeling: High damping rubber bearing
土木学会,64th JSCE Annual Conference Hokkaido:A-19 200801
Bhuiyan, A.R.

Experimental investigation of laminated rubber bearings at low temperatures
,Proceedings of the Tenth International Summer Symposium, JSCE:29-32 200801
Bhuiyan, M.A.R., Ichino, K., Okui, Y., Mitamura, H., Imai, T.

NONLINEAR VISCOSITY OF HIGH DAMPING RUBBER BEARINGS: EXPERIMENTAL INVESTIGATION AND RHEOLOGY MODEL
,土木学会第63回年次学術講演会,1-610:1219-1220 200801
Bhuiyan, A.R., Ichino, K., Okui, Y.,Mitamura, H., Imai, T.

Strength of headed stud shear connectors in steel-concrete composite beams with precast decks
,Proceedings of the Tenth International Summer Symposium, JSCE:21-24 200801
Itoh, K., Okui, Y., Ooshiro, T., Kamijyo, T.,

A rheology model of rubber bearing for seismic analysis of bridges
土木学会,9th JSCE International Summer Symposium, Yokohama, Japan 200709
Bhuiyan

A rheology model of rubber bearing for seismic analysis of bridges
土木学会,土木学会第62回年次学術講演会概要集,1-341:677-678 200709
Bhuiyan, A.R.

Design of Composite Bridges-Lateral Distortional Buckling-
,Japan-Korea joint workshop on steel bridge design specification, Hokkaido univ., Japan:CD 200708
Okui, Y

Development of Steel/Concrete Hybrid Bridges in Japan
JSCE-EIT Joint Seminar on Recent code development and advanced technologies of steel and composite bridges,Proc. of JSCE-EIT Joint Seminar on Recent code development and advanced technologies of steel and composite bridges 200703
Nagai, M., Okui, Y.,

Web Slenderness Limits for Section Classification of Composite Girders
JSCE-EIT Joint Seminar on Recent code development and advanced technologies of steel and composite bridges,Proc. of JSCE-EIT Joint Seminar on Recent code development and advanced technologies of steel and composite bridges 200703
Okui, Y.,

Load carrying capacity of cable-stayed composite girder bridges with segmental cantilever erection
SIIT-Saitama University joint seminar,Proc. of SIIT-Saitama University joint seminar 200703
Okui, Y., Nagai, M.

Composite bridges in Japan
Japan-China Conference on Structural Steel Construction,Proc. of Japan-China Conference on Structural Steel Construction 200701
Okui, Y.,

Design issues for steel-concrete composite girders,
China-Japan joint seminar on steel and composite bridges,Proc. of China-Japan joint seminar on steel and composite bridges:85-93 200701
Okui, Y.

Development of hybrid bridges and design innovation in Japan
China-Japan joint seminar on steel and composite bridges,Proc. of China-Japan joint seminar on steel and composite bridges:23-33 200701
Nagai, M., Okui, Y.

Lateral distortional buckling of steel and concrete composite twin I-girder
土木学会関東支部新潟会研究調査発表会,土木学会関東支部新潟会研究調査発表会概要集:1-020 200611
Bandula Heva, T.M., Okui, Y, Komuro, M, Nagai, M(

Crack Width Evaluation Method accounting for shear-lag effect and effective width
Korea-Japan Joint Seminar on Steel-Concrete Composite Bridges,Proc. of Korea-Japan Joint Seminar on Steel-Concrete Composite Bridges:KJ061027-7 200610
Okui, Y., Honda, T., Khan, Q.,, Nagai, M

Topics on Strength, Section Classification, Ductility requirements of Composite Girders in Japan
Korea-Japan Joint Seminar on Steel-Concrete Composite Bridges,Proc. of Korea-Japan Joint Seminar on Steel-Concrete Composite Bridges:KJ061027-5 200610
Okui, Y, Gupta, V., Inaba, N., Nagai, M

On design of composite girder bridges
Vietnum-Japan joint seminar on steel bridges,Proc. of Vietnum-Japan joint seminar on steel bridges:11-19 200609
Okui, Y., Kumar, G.V., Nagai, M

Web Slenderness Ratio Considering Initial Bending Moment Effect on Composite Girders during Construction Phase
土木学会,土木学会第61回年次学術講演会概要集,1-137:273-274 200609
Gupta, V.K., Okui, Y., Nagai, M.

Topics on ultimate strength of composite girders in Japan
,Korea-Japan Joint Workshop on Steel Bridge Design Specifications 200603
Okui Y. and Gupta V.K.

The effect of initial moment on the ultimate load-carrying capacity of composite girder under flexure
Japanese Society of Civil Engineers,60th Annual Proceeding of Japanese Society of Civil Engineers, JSCE, Japan:1-444 200509
Gupta V.K., Okui Y. and Nagai M.

On Analytical Study for Steel-Concrete Compopsite Girders, Seminar on Recent Advances in Steel Bridges in Japan
Engineering Institute of Thailand,Proc. of Bridge Engneering:1-10 200501
Okui, Y.

Research Activities

Travelling Overseas
3- , JICA

Education

Lectures

2010 , 2nd Semester , Structural mechanics II
2010 , 1st Semester , Structural mechanics III
2010 , 1st Semester , Fundamentals of Mechanics
2010 , 2nd Semester , Inelastic Structural Analysis
2009 , 2nd Semester , Structural mechanics II
2009 , 1st Semester , Structural mechanics III
2009 , 1st Semester , Fundamentals of Mechanics
2009 , 2nd Semester , Study on Specific Topics I
2009 , 2nd Semester , Inelastic Structural Analysis
2008 , 2nd Semester , Inelastic Structural Analysis

Thesis Guidance

2010 , Graduation Thesis Number of Students Total:3(International Students:1) , Master's Thesis Number of Students Total:1(International Students:1) , Doctor's Thesis Number of Students Total:2(International Students:2)
2009 , Graduation Thesis Number of Students Total:2 , Master's Thesis Number of Students Total:3(International Students:1) , Doctor's Thesis Number of Students Total:1(International Students:1)
2008 , Graduation Thesis Number of Students Total:3(International Students:1) , Master's Thesis Number of Students Total:4(International Students:1) , Doctor's Thesis Number of Students Total:1(International Students:1)

Admission of International Students

2010
2009 , First Term:2 , Second Term:1
2008 , First Term:1 , Second Term:1