This paper reports the results of our research on seismic behavior of traditional wooden houses with L-shaped plan, Magariya, in Fukushima prefecture. First, to figure out the structural ...characteristics and vibration characteristics, we investigated the seismic elements and current state of the Magariya. We understood that main part and attached part of the building may not move as one structure. In addition, we estimated seismic performance and eccentricity of Magariya by limit strength calculation.
The preservation district of groups of traditional buildings is an important category of cultural properties in Japan. Japan has entered an earthquake active period. However, conventional culturally ...and socially oriented site investigation methods hardly satisfy the requirements of risk management of district preservation. In this study, the authors introduce an investigation method from the structural and security perspectives. They explain the study procedure, methods and results. Results of the investigation of two coastal districts, namely, Ine and Yuasa, are comparatively studied, and regional disparities are highlighted. The study concludes that district vulnerability and house structural performance should be considered as important indices when making decisions regarding district preservation.
We report the changes in out-of-plane vibration characteristics due to the seismic retrofit of historic masonry buildings based on the result of microtremor measurement. Major findings from the ...research are as follows; (1) Natural frequencies increase nearly 1.1 to 1.9 times by reinforcement. And, the increasing rate of natural frequency becomes smaller as it becomes high order. (2) Using steel frame for reinforcement, out-of-plane deformation of masonry wall is restrained. And, using shear wall, it is restrained greatly. (3) 1st damping factor doesn’t change remarkable by reinforcement.
In seismic evaluation methods based on limit strength calculation, a shear force with a one-to-one correspondence with a load-bearing element is defined, and the shear force of construction only adds ...the restoring forces of the element. However, the specifications of traditional joints and element position may vary, and the calculation method does not depend on these specifications. Some previous studies have considered the specifications of traditional joints such as column-to-beam (Sashigamoi) joints based on element experiments and simulation analysis. However, the influence of element position on the structural properties and the behavior of traditional wooden frames with large section beams (Sashigamoi) based on multi-span frame experiments has been addressed in few studies. Japan has experienced numerous earthquakes, and there are many reports of traditional wooden structures collapsing because of earthquakes. However, many traditional wooden structures remain sound and unaffected and are extremely interesting. Evaluation of the seismic performance of such traditional wooden buildings may be significant in preventing damage to buildings and ensuring safety. Against this background, this paper presents the results of static cyclic loading tests and simulation analysis for four traditional wooden frames in order to understand the seismic performance of frames with uneven large section beams (Sashigamoi) and to clarify the influence of the beams and shapes of fitting-type joints on the behavior of the whole frame. Major findings of the present work are as follows: (1) First, static cyclic loading tests were conducted on four traditional wooden frames; the number of frame spans, the presence or absence of large section beams (Sashigamoi), and the position of beams were considered as the parameters. Two-span frames underwent column splitting or column breaking more readily and with smaller deformation than in the case of one-span frames. In addition, the shear forces exhibited directional dependence, which is attributed to the asymmetry of the frames or the shapes of the column-beam joints. (2) Second, a method for modeling traditional fitting-type joints was developed. This method can be used to analyze traditional wooden frames with large section beams (Sashigamoi). Simulation analysis results were in good agreement with the test results. (3) Finally, a parameter study about the aspect ratio of the frame, large section beam position, and beam height distance was carried out, and the restoring force was verified. The smaller the beam height distance, the smaller was the difference in the restoring force with the loading direction.
This paper reports the results of our research on seismic behavior of traditional wooden houses with L-shaped plan, Magariya, in Fukushima prefecture. First, to figure out the structural ...characteristics and vibration characteristics, we investigated the seismic elements and current state of the Magariya. We understood that main part and attached part of the building may not move as one structure. In addition, we estimated seismic performance and eccentricity of Magariya by limit strength calculation.
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