Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
NAMBU Yasuhiro Last modified dateļ¼š2024.05.09

Assistant Professor / Department of Architecture and Urban Design / Faculty of Human-Environment Studies


Papers
1. A STUDY ON THE STRUCTURE AND VIBRATION CHARACTERISTICS OF TRADITIONAL WOODEN STRUCTURES WITH THATCED ROOF.
2. STRUCTURAL INVESTIGATION OF WOODEN HOUSES IN THE IMPORTANT PRESERVATION DISTRICT OF GROUPS OF HISTORIC BUILDINGS IN WAKI-MACHI MINAMI-MACHI, MIMA CITY
Waki-machi Minami-machi in Tokushima prefecture is designated as the important preservation district of groups of traditional buildings, which is close to the Nankai trough and the Median Tectonic Line fault zone. Our structural investigation of traditional wooden houses there shows the seismic performance of several houses is not sufficient because of heavy weight and less of wall. Some houses have tilted pillars which are considered to have been caused by the residual deformation of former ground motions. Yield base shear coefficients correlate with natural frequency, and the houses with low yield base shear coefficient have low natural frequency..
3. STRUCTURAL INVESTIGATION AND SEISMIC PERFORMANCE EVALUATION OF TRADITIONAL WOODEN HOUSES IN SEKI IN MIE PREFECTURE
This paper reports the results of evaluation on seismic performance of traditional wooden houses in Seki, where damage caused by future earthquakes is concerned, based on structural investigation. Our conclusions are as follows. a) There are many houses that have complex plan and structure. b) Yield base shear coefficients in ridge direction is small. Moreover, we find houses that falls below the value of 0.1 because the weights of house are heavy and there is no wall adequately in the first floor. c) We confirm termite damages at a rate of around 30 % of the target houses..
4. THE SURVEY OF WOODEN HOUSES IN THE IMPORTANT DISTRICT OF GROUPS OF HISTORIC BUILDINGS (HYUGA-SHI MIMITSU) IN MIYAZAKI
Mimitsu in Miyazaki prefecture is selected to grasp the seismic performance of traditional wooden houses. Seismic performance of 8 houses is evaluated based on microtremor measurements and structural investigation. As results, there are 2 types of traditional houses. One is the type with rooms in a line, and the other is with rooms in 2 lines. The traditional houses have skip floor structure, and the vibration mode is complicated. Yield base shear coefficients of houses with rooms in 2 lines are lower than those of houses with rooms in a line..
5. Jian Jiao, Yasuhiro Nambu, Mina Sugino, Noriko Takiyama, Chiaki Watanabe, Yasuhiro Hayashi, Regional Structural Investigation on the Preservation Districts of Yuasa and Ine in Japan, JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEERING, 10.3130/jaabe.16.193, 16, 1, 193-200, 2017.01, 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..
6. EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE EVALUATION OF TRADITIONAL TIMBER FRAME STRUCTURES WITH LARGE HANGING WALLS.
7. Structural investigation and seismic performance evaluation of traditional wooden houses in Gojoshinmachi in Nara prefecture in Japan.
8. STATIC LOADING TESTS FOR TIMBER FRAMES WITH LARGE HANGING WALLS USING DRY-MUD PANELS.
9. STRUCTURAL PROPERTIES AND SEISMIC PERFORMANCE EVALUATION OF UNIQUE WOODEN FRAME USING OBLIQUE NUKI
This paper reports the results of evaluation on seismic performance for traditional wooden frame with oblique nuki of boat houses in Ine, Kyoto. Major findings from the research are as follows: (1) In the field survey, structural and vibration characteristics are clarified. (2) In the static loading test, it is found out that behavior and destruction property, shear force of the frame with oblique nuki is unique. (3) Simple analytical model is constructed and confirmed the precision. One house is took the case of, applying the restoring force calculated from the analysis, yield base shear coefficient is found..
10. SEISMIC PERFORMANCE EVALUATION OF TRADITIONAL WOODEN HOUSES AT YUASA TOWN IN WAKAYAMA PREFECTURE
The Yuasa-cho in Wakayama prefecture, which will be one of the most heavily damaged area in the next Nankai earthquake, is selected to consider how to reduce the earthquake damage of traditional wooden houses in the important district of groups of historic buildings. Seismic performance of 10 houses is evaluated based on microtremor measurements and structural characteristics investigation. As results, yield base shear coefficient of large houses with large hanging walls is about 0.2 and such houses may collapse at the maximum shear deformation angle of 1/25..
11. REGIONALITY OF STRUCTUAL CHARACTERISTICS IN TRADITIONAL WOODEN HOUSES.
12. Changes in out-of-plane vibration characteristics of unreinforced and reinforced walls of historic masonry buildings
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) 1 st damping factor doesn't change remarkable by reinforcement..