In this paper, the relations between the load-deformation property of the CLT connections and the seismic performance of the 3 story CLT construction are analytically discussed. The static and the dynamic properties of the CLT connections led each from the static and the dynamic tests were obviously different, however the analytical results based on these properties were agree each with the results of the static and the dynamic tests proving the adequateness of estimated properties. The further study on the dynamic effects of CLT connections is necessary.
The Japanese domestic forests have never been maintained enough, and it was a great fear that the multiple functions of the forest such as watershed conservation, the land conservation, and so on has been declined. The construction employing the cross laminates timber (CLT) panels was offered as a method of large scale building in domestic and foreign countries. However, the seismic design method of CLT panel construction has never completed. So, in order to consider the seismic design method, the shaking table tests and static lateral load tests were conducted to the modelized CLT panel construction.
The national research project to investigate proper structural design method for CLT (Cross Laminated Timber) buildings has been advanced by the subsidy of the Ministry of Land, Infrastructure, Transport and Tourism of Japan since 2011. This paper provides the outline of shake table tests executed as a part of the project in February 2015. Two specimens, one (Specimen A) is five story and another (Specimen B) is three story, were tested. As the result, for both specimens damage was rather slight by the strong input wave according to the Building Standard Law of Japan. Finally, Specimen A survived three dimensional input wave of 100% of JMA Kobe (strong ground motion recorded during Kobe Earthquake in 1995), and Specimen B survived 140% of JMA Kobe.
In this paper, the results of lateral loading tests on two types of CLT shear wall systems with an opening are summarized, one is the shear wall system with assembling narrow size CLT panels and another is that using one large size panel with an opening. 8 types, 13 specimens in all were tested. Load-displacement curves were obtained and characteristic values of shear performance were derived. As a result, the assembly system revealed higher ductility because of the ductility of connections between panels, while the rapture of large panel system was brittle though the shear capacity was higher than the assembly system.
The national research project to investigate proper structural design method for CLT(Cross Laminated Timber) buildings has been advanced by the subside of the Ministry of Land, Infrastructure, Transport and Tourism of Japan since 2011. This paper provides the outline, research item and main result stream of the project. Full-scaled building tests and element tests for evaluating seismic performance are described in this paper mainly. Numerical studies have been also conducting as well.
In this paper, the general process and results of the seismic design on four buildings with Japanese CLT construction after 2014 based on the time history response analysis as the only legal structural design method in Japan at the present moment, are shown. As a result, it is recognized that the buildings has enough seismic performance for the regulation of seismic design in Japan.
In this paper, the general process and results of the seismic design on a 3-story building with Japanese Sugi CLT construction based on the time history response analysis as the only legal structural design method in Japan at the present moment, are shown. As a result, it is recognized that the building has enough seismic performance for the regulation of seismic design in Japan
Structural possibility of CLT (Cross Laminated Timber) buildings in Japan is supposed to be smaller than that in other countries because of high seismic risk. In this paper, dealing 2 kind of middle-rise CLT panel construction method as objectives, the required wall quantity from the structural design method ruled in the building standard low of Japan is examined based on the knowledge from the national research project carrying out by the subsidy of MLIT (Ministry of Land, Infrastructure, Transport and Tourism) of Japan since 2011, and on the Japanese government notifications on structural design of CLT buildings issued on Apr. 1, 2016. As result, the required wall quantity in construction methods using rectangular narrow panel is generally regarded as practicable. However, reduction of wall quantity is expected for prevalence of CLT buildings. On the other hand, in construction methods using large rectangular panels with opening(s), the required wall quantity is confirmed generally 1.6 times larger than the former indicating poor practicability