Kenji Kobayashi, Keita Ogawa
One of the goals of the Laboratory of Timber Structures and Housing Environment is to provide education and research on the utilization of forest resources in a way that contributes to safe and comfortable lives for people. We are doing basic and applied research toward the goal of achieving a sustainable system for providing housing, looking at the issues comprehensively. Considering that the use of forest resources has a considerable impact on the environment, we are examining the whole process of obtaining wood products for use in architecture, from trees in the forest to the production and processing of building components, on to the design and construction of buildings.
 Seismic performance and design method of Cross Laminated Timber (CLT) structures
CLT panel construction method was developed in Europe. Large timber buildings such as residential houses are produced by using CLT wall panels and CLT floor panels. CLT panels have several layers made of timber boards and the layers are glued and laminated by changing grain direction. We conduct experiments, in cooperation with Italy’s National Tree and Wood Laboratory (IVALSA), using a shake table that can accommodate a full-scale seven-story wooden building. We evaluate the seismic performance of the buildings with this construction method.
 Pseudo-dynamic (simulated) testing of bearing walls in a wooden building, and examining response analysis models
To analyze the response of shear walls to seismic forces (a wall's ability to resist earthquakes), where a face material like structural plywood is nailed onto posts and beams, we perform structural tests using an online computer system, and we verify our analytical models by comparing the simulation results with actual tests of structures.
 Survey of the relationship between carbon dioxide emissions and the production and use of wooden buildings
Since trees, while they are growing, absorb carbon dioxide from the atmosphere, it seems reasonable that we can reduce the burden on the environment more by using wood than by using any other building material. Therefore, we are examining the environmental burden imposed by wooden buildings, by monitoring the wooden buildings constructed in Shizuoka Prefecture, quantifying the amount of CO2 released during their construction, and surveying the energy consumed by heating and cooling the finished buildings.
 Elastic – plastic behavior and rheology of the joints in timber structures
Buildings have to resist against not only short term loads such as seismic action but also long term loads such as live loads, snow loads and so on. Therefore, enough performance against these loads are required for the joints in timber buildings. We are researching about elastic-plastic behavior and rheology of the joints in timber structures through static shear tests and creep tests of the joints.
Testing pseudo-dynamic resistance to horizontal forces on a bearing wall
Finite element analysis of CLT shear wall
Conducting an environmental load survey on a wooden building at a special nursing home for the elderly (Ryusoen)
Creep test of plywood-to-timber joints