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Ohtake M.,Kanagawa University | Oya T.,TOMOE Corporation | Maida Y.,Tokyo Institute of Technology | Koyano K.,Kanagawa University | And 2 more authors.
Journal of Structural and Construction Engineering | Year: 2013

In the field of RC structures, there are many structural systems that damping members are united with a main structure which consists of columns and beams. However, when damping members are damaged, failures are more likely to extend to a main structure, because a main structure and damping members are not separated. In this study a structural system, which is separated a main structure and damping members, is proposed to realize a damage-controlled RC structure. As a damping member, the buckling-restrained brace, which has excellent seismic energy absorption capability, is used. Since the buckling-restrained brace is easy to adjust axial stiflhess and strength, it is possible to design the RC structure with the required structure performance. In this paper, feasibility of the proposed damage-controiled RC structure is verified by the confirmatory experiment.

High strength bolted friction type joints may have misalignment in the contact plane because of permissible deviation of steel plate thickness and so forth. In the first and the second paper, we proposed analytical method to evaluate the slip load of such joints tightened by turn-of-nut method. The validity of the proposed analytical method was verified, by the fact of the calculated slip load based on the analytical value of the contact force was shown good agreement with the experimental results. This paper shows the slip load applying the proposed analytical method to such joints tightened by torque control method. These slip loads are shown in case of the misalignment on the one side of the main-plates as well as in case of the misalignment on the both sides of the main-plates.

Kodera N.,Kanagawa University | Oya T.,TOMOE Corporation | Maida Y.,Tokyo Institute of Technology | Sakata H.,Tokyo Institute of Technology | Iwata M.,Kanagawa University
AIJ Journal of Technology and Design | Year: 2013

A buckling-restrained brace showing the effectiveness in earthquake-resistant and vibration-controlled technologies of steel structures is applied for RC structures. In this case, the technology development for the most suitable connection is required to solve problems of existing connections. The authors have proposed a new connection method. In this paper, 1/3 size specimens of the new connection method are tested. The good structural performance of the specimens has been confirmed.

Takeuchi T.,Tokyo Institute of Technology | Matsui R.,Tokyo Institute of Technology | Mihara S.,Tokyo Institute of Technology | Oya T.,TOMOE Corporation | And 3 more authors.
AIJ Journal of Technology and Design | Year: 2014

One of the key limits of buckling-restrained braces (BRBs) is overall flexural buckling caused by connection failure, and they are required to exhibit stable hysteresis under cyclic axial loading with initial out-of-plane drifts simulating the bi-directional effects of a ground motion. In this paper, a series of cyclic loading tests with initial out-of-plane drifts for built-up type BRB is carried out, and the stability performance including various connection conditions and initial out-of-plane drifts are researched. These results are compared with the stability evaluation equations proposed by the authors, the validity and accuracy of these equations discussed.

Oya T.,TOMOE Corporation | Kato S.,Toyohashi University of Technology | Nakazawa S.,Toyohashi University of Technology | Kashiwai K.,Nakabayashi Architecture Office
Journal of Structural and Construction Engineering | Year: 2011

The present paper discusses on a seismic performance of braces of sport halls reinforced by hystereticdampers installed in the longitudinal direction. Based on the elasto-plastic dynamic analysis depending on varying input levels, the ductility index, dF, and the seismic performance index, dIs, are re-studied. As numerical parameters, a capacity limit deformation and a yield base shear coefficientof original braces are considered together with the natural period of original substructure and the yield base shear coefficient of addedhysteretic dampers, and their effects on the ductility index are investigated. The ductility index of the reinforced structure can be estimated by the strength ratio of hysteretic dampers to those of original braces, and the seismic performance index of the reinforced structure,dI s R, can be estimated based on that of the original structure,dI s 0.

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