Time filter

Source Type

Takanashi S.,JNIOSH | Ohdo K.,JNIOSH | Takahashi H.,JNIOSH | Sakamaki Y.,Houseplus Corporation | And 3 more authors.
WCTE 2016 - World Conference on Timber Engineering | Year: 2016

The purpose of this study is to clarify the relationship between the damage to exterior walls and the residual strength of a wooden house after severe earthquakes. In the experiments, we tested two types of exterior walls of a wooden house: one made of siding and the other of mortar. We conducted shaking table tests and static loading tests on each specimen. More than 5% of the total number of nails came out by more than 1 mm from the siding exterior wall at the house's maximum strength. In the mortar exterior wall, the width of the crack around the window expanded with loading. We judged that the strength of the house decreased when the width of the crack exceeded 1 mm. In order to safely perform repair construction, this research is necessary to clarify the risk of building collapse from aftershocks.


Osawa H.,Tokyo City University | Sakamaki Y.,Houseplus Corporation | Michiba N.,Houseplus Corporation | Kagawa K.,Houseplus Corporation | And 2 more authors.
WCTE 2016 - World Conference on Timber Engineering | Year: 2016

The purpose of this study is to clarify the properties of wooden rigid frame with a plywood wall by experiments. By a combination of plywood wall and wooden rigid frame, it is possible to increase the stiffness of the rigid frame. In this case, the additional axial force from the plywood wall is generated on the column of the wooden rigid frame. And the influence must be different depends the nail fastening position of the plywood wall to the frame column. By analysis of the experimental results, it is cleared that the maximum strength, the initial stiffness and the shear force of the plywood wall depends the nail fastening position of the plywood wall.


Takanashi S.,Japanese National Institute for Occupational Safety and Health | Ohdo K.,Japanese National Institute for Occupational Safety and Health | Takahashi H.,Japanese National Institute for Occupational Safety and Health | Sakamaki Y.,Houseplus Corporation | And 3 more authors.
Journal of Structural and Construction Engineering | Year: 2015

The purpose of this study is to clarify the relationship between the damage of exterior walls and the residual strength of a wooden house after earthquakes. The two kinds of exterior wall were selected in the experiments, one was consist of a siding and another was made by a mortar. In the siding exterior wall, the nails fixing the siding board come out of after loading. In the mortar exterior wall, the width of the crack around the window expanded with loading. As a result, the residual strength of the house after earthquakes could be presumed from the damage of the exterior wall. © 2015, Architectural Institute of Japan. All rights reserved.


Sakamaki Y.,Houseplus Corporation | Michiba N.,Houseplus Corporation | Uesugi Y.,Houseplus Corporation | Ohashi Y.,Tokyo City University
Journal of Structural and Construction Engineering | Year: 2010

A new type of moment resisting timber joint has been developed. The joint is made up of steel plates, bolts and cotters. The plates and the bolts are embedded with timber element of frame structure. By combining those elements with steel cotters, moment resisting joints can be constructed easily. Static loading tests of the joint have been performed, and results of the tests made it clear that the joint have rotational rigidity and strength required from constructing moment resisting joint. In this report, three kinds of racking tests were performed to simulate the moment-rotational angle. "A tests" were prototypes, and "B tests" and "C tests" had each kinds of joint. The simulation results of moment-rotational angle curves by three kinds of tests agree with the prototype tests results.

Loading Houseplus Corporation collaborators
Loading Houseplus Corporation collaborators