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Author

Toru Takeuchi

Other affiliations: Nippon Steel
Bio: Toru Takeuchi is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Buckling & Damper. The author has an hindex of 19, co-authored 158 publications receiving 1340 citations. Previous affiliations of Toru Takeuchi include Nippon Steel.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a pilot test was conducted for evaluating the energy dissipation behavior of shear panels made of low yield steel whose 0.2 per cent offset yield stress is 120 MPa.
Abstract: This paper presents the results of a pilot test conducted for evaluating the energy dissipation behaviour of shear panels made of low yield steel whose 0.2 per cent offset yield stress is 120 MPa. A total of six full-scale shear panels were tested with the loading condition, stiffener spacing, and magnitude of axial force as test variables. The shear panels tested yielded at a shear force that is approximately 1/3 of the yield shear force of equivalent shear panels made of common mild steel. Shear panels with proper stiffener arrangement exhibited stable hysteresis, thus ensuring large energy dissipation capacity. Sufficient strain hardening was observed in the shear panels tested, with their energy dissipation capacity about 1.5 times larger than that of an equivalent linear-elastic and perfect-plastic system. Plate buckling did not lead the shear panels to immediate degradation in their energy dissipation capacity. Post-buckling resistance was found to be a subject that requires further studies for quantifying the performance of shear panels made of low yield stress steel as hysteretic dampers.

163 citations

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TL;DR: In this article, cyclic loading tests and numerical analyses of BRBs were carried out using various tube restrainer configurations to investigate the influence of local buckling of the restrainer on BRB strength and ductility.

121 citations

Journal ArticleDOI
TL;DR: In this article, a new type of seismic resistant structural steel braced-frame system is introduced that employs controlled rocking, elastic post tensioning, and replaceable fuses to resist earth quake shaking with limited structural damage.
Abstract: A new type of seismic resistant structural steel braced-frame system is introduced that employs controlled rocking, elastic post tensioning, and replaceable fuses to resist earth quake shaking with limited structural damage. Through the use of capacity design prin ciples, inelastic energy dissipation is confined to replaceable fuses while the controlled rocking and elastic post tensioning provide self-centering action to eliminate residual drift. Quasi-static cyclic tests and dynamic shake table tests of large-scale specimens confirm that the system can sustain extreme earthquake ground shaking with story drift ratios up to 3 % without structural damage. Owing to the well-defined rocking mechanism, analysis and design of the system is straightforward. Work is ongoing to develop design criteria and guidelines to facilitate practical implementation of these system in building design and construction.

110 citations

Patent
Toru Takeuchi1, Yasushi Maeda1, Kazuaki Suzuki1, Ken Okada1, Satoshi Yamada1, Akira Wada1 
06 May 2004
TL;DR: A column-and-beam join structure comprises connecting the column and beam with a pair of split tees as discussed by the authors, where the sides of the bolts are in the proximity to the side surface of the portion of the web of the split tee having the reduced cross-sectional area.
Abstract: A column-and-beam join structure comprises connecting the column and beam with a pair of split tees. At least one split tee has a web with a portion of the web having a reduced cross-sectional area. The web with the reduced cross-sectional area is located between a flange of the beam and a buckling restraint. The buckling restraint is connected to the flange of the beam with bolts. The sides of the bolts are in the proximity to the side surface of the portion of the web of the split tee having the reduced cross-sectional area. Annular members may be arranged surrounding portions of the bolts that are in proximity to the side surface of the portion of the web having the reduced cross-sectional area.

85 citations

Journal ArticleDOI
TL;DR: In this article, a simple method is proposed for predicting the cumulative deformation and energy absorption capacities of buckling restrained braces under random amplitudes, which does not require analyses of individual amplitudes and the values of interest are directly determined from the response indexes.
Abstract: Recently, passive vibration control design has gained popularity. The aim of this design is to absorb most of the seismic energy by using additional dampers while maintaining the elasticity of the main structure. Buckling restrained braces (BRBs) are used as one of the elastoplastic dampers in this design and, therefore, the cumulative deformation capacity of BRBs to the point of fatigue fracture is an important benchmark for their performance. The estimation of this value under a random amplitude is complicated however, as this value is affected by the loading history. In this study, past experiments on BRBs are revisited in order to investigate the relation between the cumulative deformation capacity and the applied loading history. Based on these analyses, a simple method is proposed for predicting the cumulative deformation and energy absorption capacities of BRBs under random amplitudes. In contrast to Miner's method, the proposed method does not require analyses of the individual amplitudes, and the values of interest are directly determined from the response indexes.

67 citations


Cited by
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01 Jan 1971
TL;DR: In this article, the authors deal with the dynamic ASPECTS of the sub-subject: MATHEMATICAL ANALYSIS of systems SUBJECTED to INDEPENDENT VIBRATIONS by means of MATHEATICAL MODELS.
Abstract: PART 1 DEALS WITH THE DYNAMIC ASPECTS OF THE SUBJECT: MATHEMATICAL ANALYSIS OF SYSTEMS SUBJECTED TO INDEPENDENT VIBRATIONS BY MEANS OF MATHEMATICAL MODELS. THE ANALYTICAL SYSTEMS USED ARE NON-LINEAR SYSTEMS, HYDRODYNAMICS AND NUMERICAL METHODS. PART 2 EXAMINES SEISMIC MOVEMENTS, THE DYNAMIC BEHAVIOUR OF STRUCTURES AND THE BASIC CONCEPTS OF THE SEISMIC DESIGN OF STRUCTURES.

675 citations

Journal ArticleDOI
TL;DR: In this article, a steel energy dissipative device for earthquake protection of structures is presented, which is fabricated from a standard structural wide-flange section with a number of slits cut from the web, in a vierendeel truss arrangement.

294 citations

Journal ArticleDOI
TL;DR: The utilization of structural control systems for alleviating the responses of civil engineering structures, under the effects of different kinds of dynamics loadings, has become a standar....
Abstract: Nowadays the utilization of structural control systems for alleviating the responses of civil engineering structures, under the effects of different kinds of dynamics loadings, has become a standar ...

190 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed simple models that can simulate the hysteretic behavior of shear panels made of low-yield steel, which exhibits significant strain-hardening under load reversals.
Abstract: This paper proposes simple models that can simulate the hysteretic behavior of shear panels made of low-yield steel, which exhibits significant strain-hardening under load reversals. The models are based on either the bilinear or the Ramberg-Osgood model, and combine kinematic and isotropic hardening in a linear manner by the introduction of a weighting coefficient. The accuracy of these models is demonstrated by comparing hysteresis curves obtained from these models with experimental hysteresis curves, which have been supplied by a quasi-static loading test with a prescribed deformation history and by a pseudodynamic test. Programming of these models is found to be very easy, involving only slight modification of the programs developed for the bilinear and the Ramberg-Osgood models. Thus, these models can readily be incorporated into inelastic dynamic response analysis of structures having shear panels made of low-yield steel as hysteretic dampers.

162 citations

Journal ArticleDOI
TL;DR: Seismic isolation is a technique that has been used around the world to protect building structures, nonstructural components and content from the damaging effects of earthquake ground shaking as mentioned in this paper.
Abstract: Seismic isolation is a technique that has been used around the world to protect building structures, nonstructural components and content from the damaging effects of earthquake ground shaking. This paper summarizes current practices, describes widely used seismic isolation hardware, chronicles the history and development of modern seismic isolation through shake table testing of isolated buildings, and reviews past efforts to achieve three-dimensional seismic isolation. The review of current practices and past research are synthesized with recent developments from full-scale shake table testing to highlight areas where research is needed to achieve full seismic damage protection of buildings. The emphasis of this paper is on the application of passive seismic isolation for buildings primarily as practiced in the United States, though systems used in other countries will be discussed.

161 citations