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Kikuchi A.,Akito Kikuchi Architect and Associates | Kajikawa H.,Misawa Homes Institute of Research and Development
WCTE 2014 - World Conference on Timber Engineering, Proceedings | Year: 2014

This project aims to quickly and inexpensively deliver, to people who have lost their homes due to a variety of reasons, safe and secure huts that use wooden panels and can be used for longer periods than tents. The huts will be provided to people in areas including those stricken by natural disasters such as earthquakes, as well as war zone refugee camps, thereby aiding them in their recovery from disasters and conflict.


Nishikawa S.,Nihon University | Abiko H.,Misawa Homes Institute of Research and Development | Kurihara J.,Misawa Homes Institute of Research and Development | Ishizawa K.,Japan National Institute of Polar Research | Endo N.,Japan National Institute of Polar Research
IEEJ Transactions on Power and Energy | Year: 2011

To reduce the volume of fuel consumed at Syowa base in Antarctica, we study the proper renewable energy system (RE system) to supply both electrical and thermal energy. Though a lot of photovoltaic power generation systems (PV systems) and wind power generation systems (WG systems) have already been installed all over the world, climate is quite different from other area and we have few experiences on renewable energy system in Antarctica. Moreover, though thermal load is much bigger than electrical load all the year round, both PV system and WG system generate only electrical energy. Therefore we proposed a power supply system composed of PV, WG and heat pump to convert a part of electrical energy to thermal energy. It is important to clear the proper system capacity, operational method of heat pump in this system. As a first step, we studied those items on this system without energy storage system by a simulation. We found that proper operational method of heat pump is affected by capacity of RE system and WG system is useful more than PV system. © 2011 The Institute of Electrical Engineers of Japan.


Koseki J.,University of Tokyo | Wakamatsu K.,Kanto Gakuin University | Sawada S.,OYO Corporation | Matsushita K.,Misawa Homes Institute of Research and Development
Soil Dynamics and Earthquake Engineering | Year: 2015

Sand boiling and liquefaction-induced damage to houses and infrastructures occurred in Minami-Kurihashi, Kuki City, during the 2011 off the Pacific Coast of Tohoku Earthquake, Japan. After the earthquake, extensive site investigations were conducted in the affected areas, including 14 borehole surveys and 43 sounding tests, where Piezo Drive Cone penetrometer, a newly developed test method, was used which could be effectively employed in detecting local change of soil profiles. A filled sandy soil layer existed near the ground surface in the affected areas, which originated from reclamation works using dredged materials to construct housing lots. In addition, a Holocene sandy soil layer existed partly at a depth of about 10-13. m. Though these two layers were evaluated to be potentially liquefiable, the liquefaction-induced damage was observed to concentrate in the areas where the reclamation works had been executed, suggesting that the liquefaction of the reclaimed layer caused such damage. It was deduced that possible liquefaction of the Holocene layer did not contribute to the damage and to the occurrence of sand boiling at the ground surface. As countermeasure against future liquefaction, ground water lowering method has been selected, and in-situ tests and numerical analyses were executed to predict the long-term ground settlement. A subsequent study on detailed design of the selected countermeasure is underway as of June 1, 2015. © 2015 Elsevier Ltd.


Gao Y.,Misawa Homes Institute of Research and Development | Kajikavva H.,Misawa Homes Institute of Research and Development
11th World Conference on Timber Engineering 2010, WCTE 2010 | Year: 2010

Studying of the hysteretic characteristics is essential to the wooden structures design and reliability analysis. The force-displacement response of wooden wall under cyclic loading, which is highly nonlinear, is generally simulated by the bilinear and trilinear hysteric models. This paper presents the development and validation of a new type of hysteretic model, which is highly nonlinear while computationally efficient and mathematically traceable. Comparison of predicted cyclic response and experimental data showed that the proposed model is sufficiently accurate. Japanese conventional wooden structure with 12 types shear walls were subjected to the cyclic loading test. Hysteresis models of diagonal bracing shear wall was firstly developed and validated by experimental results. Then the verification of models was applied to the structure board shear wall. On the other hand, a collapse database system supposed to be used for structural design and earthquake survey was established. Failures of structural components were observed and the correlations between the finish material and structural components were studied It is the purpose of this paper to present a realistic method for the design of wooden structures that should result in more efficient use of the structure.

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