scholarly journals HORIZONTAL LOADING TEST AND HYSTERETIC CHARACTERISTICS OF ACTUAL TRADITIONAL TIMBER TEMPLES : Evaluation of seismic safety of traditional timber temples Part 1

2007 ◽  
Vol 72 (612) ◽  
pp. 117-123
Author(s):  
Tetsuro ONO ◽  
Yoshihiko KAMEYAMA ◽  
Hideki IDOTA ◽  
Atsushi SATO ◽  
Takahiro KANNO
Keyword(s):  
Loading Test ◽  
Seismic Safety ◽  
Horizontal Loading ◽  
Hysteretic Characteristics

Laminated Type Isolation Device for Light Weight Structure Using Urethane Elastomer

2017 ◽  
Author(s):  
Kengo Goda ◽  
Osamu Furuya ◽  
Kohei Imamura ◽  
Kenta Ishihana
Keyword(s):  
Seismic Isolation ◽  
Base Isolation ◽  
Light Weight ◽  
Loading Test ◽  
Isolation System ◽  
Seismic Safety ◽  
Base Isolation System ◽  
Weight Structure ◽  
Isolation Device ◽  
Urethane Elastomer

At the present, base isolation system has been recognized by general earthquake resistant technique since the Great Hanshin Earthquake 1995. The seismic isolation will be aggressively applied to not only architectural and civil structures but also various structures, because the effectiveness on seismic safety had been demonstrated again in the Great East Japan Earthquake. In generally, although the base isolation system is divided into laminated rubber bearing type and friction sliding bearing type. In the case of former type, shape factor, maximum or minimum outer shapes and so on are restricted by the material characteristics in visco-elastic material. In general, the isolation structure is used in high damping rubber. However, we pay attention to base isolation using urethane elastomer. Urethane elastomer has excellent elasticity, mechanical strength, abrasion resistance, weather resistance, oil resistance, impact resistance the absorbent, anti-vibration and excellent low-temperature properties. Furthermore, it is possible to impart various characteristics by a combination of isocyanate and polyol and chain extender, requires no large-scale apparatus, it has the advantage molecular design is easy. In previous study, the research and development of laminated type base isolation device using urethane elastomer was carried out to upgrade a seismic safety for various structures. The fundamental characteristics was investigated from several loading test by using various experimental devices, and the design formula for the stiffness and equivalent damping coefficient is formulated as an approximate expression of mechanical characteristics until now. It was confirmed that urethane elastomer is not hardening up to 500% shear strain. Moreover, the experimental examination for aged deterioration in the urethane material has been continuously carried out. As the results, it was confirmed that the laminated type seismic isolation device using urethane elastomer is possible to develop as a practicable device from the stable mechanical properties as considering in design step. In this study, the small-scale laminated type base isolation device using urethane elastomer is advanced to the direction of further technical upgrading and of scale down for light-weight structure as a sever rack. The first stage, basic properties of the urethane elastomer has been investigated by loading test. Furthermore, the design equation is created by loading test using urethane elastomer. The validity of the design equation has been confirmed. The second stage, the compression creep test with laminated type base isolation device has been investigated to confirm an effect on light-weight mechanical devices.

scholarly journals NON-LINEAR BEHAVIOR OF PILE GROUP-SOIL SYSTEM BASED ON HORIZONTAL LOADING TEST SUBJECT TO LARGE DISPLACEMENT

2007 ◽  
Vol 72 (614) ◽  
pp. 45-52 ◽  
Author(s):  
Takashi KURATA ◽  
Hisatoshi KASHIWA ◽  
Yasuhiro HAYASHI ◽  
Shuji TAMURA ◽  
Keiichiro SUITA
Keyword(s):  
Pile Group ◽  
Test Subject ◽  
Large Displacement ◽  
Loading Test ◽  
Soil System ◽  
Horizontal Loading ◽  
Linear Behavior ◽  
Non Linear

Repairing and Recovering Structural Performance of Earthen Walls Used in Japanese Dozo-Style Structures After Seismic Damage

2018 ◽  
Vol 13 (7) ◽  
pp. 1333-1344
Author(s):  
Hajime Yokouchi ◽  
Yoshimitsu Ohashi ◽  
◽  
Keyword(s):  
Structural Performance ◽  
Horizontal Force ◽  
Loading Test ◽  
Surrounding Environment ◽  
Horizontal Loading ◽  
Survey Results ◽  
Loading Tests ◽  
Kanto Region ◽  
Offshore Earthquake ◽  
Sound Condition

Several traditional building group districts exist in Japan as a system for preserving the remaining historical villages and townscapes of the country, along with their surrounding environment. In the northern Kanto region of Japan, there remain examples of many dozo-style structures called “Dozo-dukuri,” forming a distinctive historical townscape. In the 2011 Tohoku Region Pacific Offshore Earthquake, the traditional townscapes and dozo-style structures of the Kanto region were seriously damaged. When restoring the walls of damaged dozo-style structures to a sound condition, demolishing and reconstructing all the mud requires considerable labor; moreover, few modern artisans can construct mud walls. However, if there was a method that could recover the structural performance of the walls immediately via partial repair, the restoration of the walls could again become economical. Therefore, in this study, we first surveyed the specifications of mud walls in the northern Kanto region. Then, we performed horizontal loading tests on full-scale walls produced according to the survey results to determine the structural performance of walls under a horizontal force, e.g., an earthquake. Further, a test specimen damaged by a horizontal force was repaired, and a horizontal loading test was performed again. The results elucidated the structural performance recoverability obtained by the proposed repair method.

Study on Laminated Type Base Isolation Device Using Urethane Erastomer for Practical Application

2015 ◽  
Author(s):  
Kenta Ishihana ◽  
Osamu Furuya ◽  
Kengo Goda ◽  
Shohei Omata
Keyword(s):  
Mechanical Characteristics ◽  
Base Isolation ◽  
Approximate Expression ◽  
Response Analysis ◽  
Loading Test ◽  
Cross Sectional ◽  
Isolation System ◽  
Seismic Safety ◽  
Isolation Device ◽  
Urethane Elastomer

Base isolation system will be aggressively applied to not only architectural and civil structures but also various structures, because the effectiveness on seismic safety had been demonstrated again in the Great East Japan Earthquake. In this study, the research and development of laminated type base isolation device using urethane elastomer has been carried out to upgrade a seismic safety for various structures. The fundamental characteristics have been investigated from several loading test by using various experimental devices, and the design formula for the stiffness and equivalent damping coefficient is formulated as an approximate expression of mechanical characteristics until now. Moreover, the experimental examination for aged deterioration in the urethane material has been continuously carried out. This paper summarizes the mechanical characteristics based on the loading test up to 500% shear strain using experimental specimen with 100×100 mm cross-sectional shape, base isolation effect from time response analysis using nonlinear element model of urethane elastomer and the accelerated aging test for verifying the aging of practical use.

scholarly journals A REVIEW OF p-y RELATION FOR SINGLE PILES BASED ON FIELD HORIZONTAL LOADING TEST DATA

2011 ◽  
Vol 17 (35) ◽  
pp. 95-100
Author(s):  
Nao YOSHIKAWA ◽  
Yasutsugu SUZUKI ◽  
Koichi KOBAYASHI ◽  
Shigeo KANAI ◽  
Yukio ABE
Keyword(s):  
Test Data ◽  
Loading Test ◽  
Horizontal Loading ◽  
Single Piles

scholarly journals PROPOSAL OF STRUCTURAL SYSTEM OF DOUBLE WOOD SIDING WALL AND HORIZONTAL LOADING TEST(Architectural Planning and Design)

2006 ◽  
Vol 12 (23) ◽  
pp. 315-320 ◽  
Author(s):  
Mahito NAKAZONO ◽  
Naotoshi FUJI ◽  
Shinji IWATA ◽  
Kazuya BONKOBARA ◽  
Eiichi INAI ◽  
...  
Keyword(s):  
Structural System ◽  
Loading Test ◽  
Planning And Design ◽  
Horizontal Loading ◽  
Architectural Planning

REINFORCEMENT METHOD OF COMPOSITE SEISMIC RESISTANT WALL BY STRUCTURAL PLYWOOD AND STEEL MEMBERS

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Seine Kono ◽  
Haruka Kataoka ◽  
Takumi Ito
Keyword(s):  
Mechanical Properties ◽  
Plane Deformation ◽  
Horizontal Direction ◽  
Loading Test ◽  
Structural Wall ◽  
Steel Columns ◽  
Horizontal Loading ◽  
Steel Members ◽  
Seismic Resistant ◽  
Out Of Plane

This is a study of a composite structural wall of wood and steel, in which two steel columns are sandwiched between two plywoods with a thickness of 12 mm. Previous studies have shown that plywood undergoes out-of-plane deformation that interferes with the usability of the building. Therefore, a horizontal loading test was conducted with the position of the bolt that fastens the plywood as a parameter, and out-of-plane deformation and destructive properties were examined. Furthermore, in order to suppress out-of-plane deformation of plywood, we proposed a new reinforcement method using a steel member with a thickness of 3.2 mm. Also, its effect was verified experimentally. As a result of experiments with four types of bolt layouts, the specimen with bolt layout close to center presented small out-of-plane deformation, and each bolt layout effected the mechanical properties each other. The out-of-plane reinforcement was effective for bolt layouts that were long in the horizontal direction.

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