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Chuo-ku, Japan

Azumi Y.,Nihon System Sekkei Inc. | Murakami M.,Kindai University
Journal of Structural and Construction Engineering | Year: 2016

Most formulae to calculate the shear stiffness of a sheathed shear wall are derived under the assumption of rigid frames connected with pins. But the flexural and axial deformation of vertical studs affects the shear stiffness of a shear wall. A few other conventional formulae to calculate the shear stiffness of a sheathed shear wall consider only the effect of the flexural deformation of vertical studs. Since there is no calculation method of the shear stiffness considering the effect of the flexural and the axial deformation of vertical studs, numerical analyses are conducted. In this paper, we derive simplified formulae based on the principle of minimum potential energy. The formulae are verified by numerical static elasticity analyses. Source

Tachibana K.,University of Tokyo | Isoda H.,Shinshu University | Okazaki T.,Nihon System Sekkei Inc. | Koshihara M.,University of Tokyo | And 3 more authors.
11th World Conference on Timber Engineering 2010, WCTE 2010 | Year: 2010

Recently, environmental issues such as global warming have gained international attention with worldwide focus on ways to reduce human impacts. The efficient use of wood materials is one of the effective methods of reducing environmental load from the standpoint of "carbon fix" and "suppression of carbon-dioxide emissions". We discuss about the specimen, a single story of steel with six stories of wood on top, on Japanese Building Codes. On primary and secondly design, the ability of specimen is enough and This specimen have balanced wall on the discussion about story drift, stiffness and eccentricity. On the discussion of the ATS system, we find it is also enough in most cases. However, we find that a few places would need larger bearing plates if designed in accordance with the Japanese Building Code. Source

Okazaki T.,Nihon System Sekkei Inc. | Isoda H.,Shinshu University | Wakashima Y.,Forestry and Fisheries Research Center
11th World Conference on Timber Engineering 2010, WCTE 2010 | Year: 2010

This paper describes the following three points regarding with seismic mass: 1) Shaking table tests for furniture were executed to understand the relationship between its dynamic behaviour and effective mass, 2) Numerical model and its parameters to trace the results of the shaking table tests were defined, 3) To predict the response value of the wood-frame house, time history analysis was conducted to the 3-mass analysis model assumed two-story wood-frame house with the furniture element. The following findings were obtained: Effective masses of furniture were about 20-50% of real mass during the excitation. Meanwhile, the result of time history analysis was that the horizontal force given to the building has been generally reduced by the behaviour of furniture, and it was similar to the result when furniture (live load) was ignored. Source

Idota H.,Nagoya Institute of Technology | Yamazaki K.,Nagoya Institute of Technology | Hanai T.,Ebisu Building Laboratory Co. | Kawabata H.,Nagoya University | And 2 more authors.
AIJ Journal of Technology and Design | Year: 2011

In order to achieve the reasonable and economic aseismic reinforcement for old wooden houses, it is very important to clarify the seismic performance of the quake-resistant shear walls with opening in structural plywood. The purpose of this paper is to evaluate strength and stiffness of the wooden shear walls with panel opening. Twenty three types of test specimens with various shapes of opening on the structural plywood are employed as a load-bearing tests under cyclic loads. Based on the experimental results, the paper proposes the useful evaluation sheets for an economical aseismic reinforcement. Source

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