Papers - OBATA Makoto
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Prediction of Adhesion Behavior of Sea-Salt Particles on Bridge Girders Reviewed
Makoto Obata, Yasunari Watanabe, Li Guotai, Yoshiaki Goto
Proceeding of EASEC12 2011.01
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
It is important to estimate corrosion environment of steel bridges for a proper corrosion prevention and maintenance program. The governing factors of corrosion are temperature, humidity and various dusts on the surfaces. Among them, the adhered sea-salt particulate matter (SSPM) is most important and therefore airborne SSPM near a bridge site must be considered in its design. To prevent degradation of protective paint, forced wash out of adhered SSPM has been tried in some bridges. In order to make a proper plan of wash out, it is better to know adhesion behaviors of SSPM to bridge girders, which in turn depend mainly on the amount of airborne sea salt particles and wind on a bridge site. The objective of this manuscript is to pursue numerical method to simulate the adhesion behavior of salt particles oriented from ocean. To this end, amount of airborne SSPM at a given location will be estimated by a meteorological analysis which can reasonably considers a generation of SSPM on ocean surface. Detailed adhesion behaviors of salt particles are estimated using CFD analysis with the help of the amount of SSPM and wind data given by a meteorological analysis. The comparisons between the numerical and observed results showed that the numerical analysis can reproduce essential behaviors of airborne SSPM.
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Position Determination in Three Dimensional Structural Testing System Reviewed
XianFeng Wang, Feng Xing, Makoto Obata, Yoshiaki Goto
ADVANCES IN STRUCTURES, PTS 1-5 163-167 4478 - + 2011
Language：English Publishing type：Research paper (international conference proceedings) Publisher：TRANS TECH PUBLICATIONS LTD
A three dimensional structural testing system for static and pseudo dynamic test is developed, in which a coordinate system has been used in the measurement. The center of the ball joint hinge in an almost neutral position for the displacements of three actuators was the origin. However n process since the initial error cannot be controlled. This makes it difficult to exactly compare the results for different coordinate systems though the error is small. In this paper, to eliminate this difference, we set up a new coordinate system with the origin being the point of absolute zero of the actuator displacements. Since the origin usually cannot be measured directly, the new coordinate system is determined by appending three unknowns and a set of equations at the origin. The transformation between the new coordinate system and the previous one is obtained using a shift and Eulerian angles.
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日本海側の鋼橋を洗浄して防錆 その費用と効果
「宮本重信」，「北島浩」，「小島高志」，「篠原正」，「小畑誠」，「永田和寿」，「奥村茂」，「古木敬三」
ゆき 21 ( 4 ) 32 - 36 2010.10
Language：Japanese Publishing type：Research paper (other academic) Publisher：雪センタ-
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Error effect analysis in shape measurement of bridge pier model by laser transducer Reviewed
XianFeng Wang, Feng Xing, Makoto Obata, Yoshiaki Goto
Proc. of 2nd international symposium on service life design for infrastructure 2 1027 - 1034 2010.10
Language：English Publishing type：Research paper (international conference proceedings)
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Numerical Analysis of airborne Sea-Salt Particulate Matter on a Bridge Site(jointly worked) Reviewed
Li Guotai, Shigenobu Miyamoto, Yoshiaki.Goto
Proc. PSSC2010 1196 - 1202 2010.10
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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A novel size measurement method for a column type specimen Reviewed
Makoto Obata, Weng Fung, Yoshiaki Goto
Journal of Structural Engineering 56 68 - 76 2010.03
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Numerical analysis of sea-salt particulate matter adhesion on bridge surfaces Reviewed
M. Obata, T. Hasegawa, K. Nagata, Y. Goto
Proc. ICASS09 369 - 376 2009.04
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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Ultimate State of Thin-Walled Circular Steel Columns under Bidirectional Seismic Accelerations Reviewed
Y. Goto, M. Muraki, M. Obata
J. Structural Engineering, ASCE 135 2009.04
Language：English Publishing type：Research paper (scientific journal)
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Pull-out strength of interacting bond-type anchors Reviewed
M. Obata, Y. Goto
Steel and Composite Structures 441 - 447 2008.04
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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Stability of thin-walled stiffened square steel columns under bi-directional seismic excitations Reviewed
Y.Goto,R. Koyama,M.Obata
Proc. CIMS2008 563 - 570 2008.04
Language：English Publishing type：Research paper (international conference proceedings)
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Effects of stiffeners on stability and ductility of stiffened thin-walled steel columns with rectangular cross section under bi-directional loading Reviewed
M.Obata,H.Suzuki,Y.Goto
Proc. CIMS2008 555 - 562 2008.04
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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固気２相流解析による飛来塩分の付着シミュレーション Reviewed
小畑誠,長谷川高士,永田和寿,後藤芳顯
構造工学論文集 54A 590 - 598 2008.04
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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２方向繰り返し荷重を受ける矩形断面鋼製橋脚柱の履歴特性 Reviewed
後藤芳顯,江坤生,小畑誠
土木学会論文集 63 122 - 141 2007.04
Language：Japanese Publishing type：Research paper (scientific journal)
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Ultimate States of Thin-walled Steel Columns under Bi-directional Seismic Accelerations Reviewed
Y.Goto,N.Taki,M.Obata
Proc. ICASS07 CDROM 2007.04
Language：English Publishing type：Research paper (international conference proceedings)
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Numerical simulation of corrosion environment inside steel box-girders Reviewed
M.Obata,T.Hasegawa,K. Nagata,Y.goto
Proc. ICASS07 CDROM 2007.04
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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Development of multidirectional structural testing system applicable to pseudodynamic test, Reviewed
M. Obata, Y. Goto
J. Structural Engineering, ASCE 133 638 - 645 2007.04
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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熱流体解析による箱桁内の腐食環境シミュレーション Reviewed
小畑誠,安田大樹,永田和寿,後藤芳顯
構造工学論文集 53A 834 - 843 2007.04
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Development of multidirectional structural testing system applicable to pseudodynamic test Reviewed
Makoto Obata, Yoshiaki Goto
Journal of Structural Engineering 133 ( 5 ) 638 - 645 2007
Language：English Publishing type：Research paper (international conference proceedings)
An accurate multidirectional structural testing system is developed. This testing system is used to carry out a multidirectional pseudodynamic test with the help of a unique three-dimensional hinge and a spatial truss-type transducer. With this testing system, multidirectional seismic behaviors of thin-walled circular steel columns are examined in comparison with their in-plane behavior. Further, the accuracy of the testing system is confirmed by the numerical results of nonlinear FEM shell analyses. © ASCE.
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２方向擬似動的実験において制御誤差が精度に与える影響 Reviewed
小畑誠，羽根史浩,後藤芳顯
構造工学論文集 52A 511 - 519 2006.04
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Stability and ductility of thin-walled circular steel columns under cyclic bidirectional loading Reviewed
Y.Goto,K.S. Jiang,M.Obata
J. Structural Engineering, ASCE 132 1621 - 1631 2006.04
Language：English Publishing type：Research paper (scientific journal)
