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108 results on '"Yamaguchi, Eiki"'

4. Application of Buckling Restrained Damper to Steel Arch Bridge

Author

Sosorburam, Purevdorj, Yamaguchi, Eiki, Enkhbold, Namkhainyambuu, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Mazzolani, Federico M., editor, Dubina, Dan, editor, and Stratan, Aurel, editor

Published
2022
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5. Design of Buckling Restrained Damper for Retrofit of Steel Truss Bridge

Author

Enkhbold, Namkhainyambuu, Sosorburam, Purevdorj, Yamaguchi, Eiki, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Mazzolani, Federico M., editor, Dubina, Dan, editor, and Stratan, Aurel, editor

Published
2022
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18. Seismic resilience analysis of a retrofit-required bridge considering moment-based system reliability

Author

Chiu ChienKuo, Daniel Santoso, and Yamaguchi Eiki

Subjects
021110 strategic, defence & security studies, business.industry, Computer science, Mechanical Engineering, 0211 other engineering and technologies, 020101 civil engineering, Ocean Engineering, 02 engineering and technology, Building and Construction, Structural engineering, Induced seismicity, Geotechnical Engineering and Engineering Geology, Bridge (interpersonal), 0201 civil engineering, Moment (mathematics), Earthquake resistant structures, Retrofitting, Safety, Risk, Reliability and Quality, business, Resilience (network), Reliability (statistics), Civil and Structural Engineering
Abstract

For a bridge, its columns or piers, which are the main seismically resistant members of the bridge, are generally retrofitted to improve seismic performance. However, retrofitting may cause unexpec...

Published
2020

24. Simple degenerate formulation for large displacement analysis of beams

Author

Yamaguchi, Eiki, Kanok-Nukulchai, Worsak, Hammadeh, Muhammad, and Kubo, Yoshinobu

Subjects
Finite element method -- Methods, Girders -- Analysis, Structural analysis (Engineering) -- Methods, Science and technology
Abstract

A finite-element formulation for the large displacement analysis of beams is proposed. It is based on the degeneration approach: The governing equations for a general solid are directly discretized. The assumptions of the Timoshenko beam theory are implemented in the discretization process by devising beam elements and utilizing the penalty method. The formulation for 2D beam analysis is first presented and the 3D formulation follows. Characteristically, the proposed beam elements possess relative nodes and rotations are excluded from nodal variables. The beam formulations thus developed are quite simple and straightforward. It is noteworthy that unlike conventional formulations, the present formulation for 3D beam analysis is just a simple extension of the 2D case, which can be attributed mainly to the avoidance of rotations in nodal variables. In numerical examples, the approximate penalty number is investigated first by analyzing a cantilever beam, and it turns out to be [10.sup.3] times Young's modulus. With this value, example problems are solved and excellent agreement with the existing solutions is observed, confirming the validity of the present formulation.

Published
1999

26. Accurate and efficient method for analysis of reinforced concrete structures

Author

Yamaguchi, Eiki and Ohta, Toshiaki

Subjects
Reinforced concrete -- Analysis, Finite element method -- Usage, Engineering and manufacturing industries, Science and technology
Abstract

An accurate and efficient finite-element method for the analysis of reinforced-concrete structures is presented. Not only mechanical problems but also heat-conduction problems are targeted. Considering the fact that reinforcement details in concrete structures are inherently complex, the embedded representation of reinforcement is advantageous and is therefore used herein. Effort is then made to improve computational efficiency. To this end, although the embedded representation is usually associated with higher-order elements, a four-node quadrilateral element is employed since mathematical manipulation of lower-order elements is much easier. By solving several example problems, the accuracy of the embedded representation used in connection with lower-order elements and the efficiency of the present approach are confirmed. Clear-cut advantages of the embedded representation over the widely used discrete representation are also demonstrated.

Published
1993

37. Post-failure behavior of concrete materials in compression

Author

Yamaguchi Eiki and Chen Wai-Fah

Subjects
Stress (mechanics), Yield (engineering), Materials science, Mechanics of Materials, Mechanical Engineering, Tension (geology), Ultimate tensile strength, General Materials Science, Composite material, Deformation (engineering), Mortar, Compression (physics), Softening
Abstract

Since macroscopic observations yield no significant information regarding the post-failure softening behavior of concrete, a microscopic approach is therefore taken in the present study. Microscopic experimental observations show that post-failure behavior is closely associated with the development of mortar cracks. A micromechanical study suggests that the presence of transverse tension in the mortar region is crucial for the unbounded growth of a mortar crack leading to tensile failure under compressive loading. Furthermore, the stress analysis of concretelike composites reveals the considerable dependence of the stress state in the mortar region on the relative locations of aggregates in the neighborhood. The conclusion drawn from these studies is that the deformation in the post-failure regime is likely to be nonhomogeneous. This conclusion casts doubt about the legitimacy of an analytical effort to reproduce post-failure macroscopic stress-strain curves and seems to give a rational reason why the description of softening behavior in terms of macroscopic stress and strain becomes inappropriate after failure.

Published
1990

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