In this study, wind response properties of high damping laminated rubber bearings (HDR) is investigated by experimental and analytical methods. According to the experimental result of HDR, horizontal creep deformation depends on magnitude of dynamic loading as well as that of static loading under the wind loading. This feature differs from other seismic isolation devices. Then we propose the simplified evaluation method and hysteresis model for time history response analysis under wind loading, which are established by taking account of the effect of creep deformation caused by dynamic loading. Firstly, we perform the wind loading test for high damping laminated rubber bearings and establish the simplified evaluation method and hysteresis model based on the test results. Next, we verify the validity of proposed models by comparing the analysis results with experimental results. Finally, we perform the time history response analysis using proposed hysteresis model.
This paper describes development of substructure real-time online response testing system (SROLT) for seismically isolated building with a small response delay using existing experimental equipment. Authors made analytical examinations of the influence of response delay to the test results caused by using existing experimental equipment, and developed a control method to minimize the problem. It was demonstrated by various test results that the developed system has sufficient accuracy as SROLT for seismically isolated buildings.
The authors have been developed a system for base isolation of a wooden house and a prefabricate house. It consists of sliding bearings and laminated rubber bearings. There are two types of sliding bearings, one has the coefficient of friction of 0.046, the other has 0.06. Each of sliding bearings supports 30 ∼ 40kN of vertical load, the surface pressure of the sliding shoe is 10 ∼ 12 N/mm2 (10∼12MPa). The horizontal stiffness of the laminated rubber bearing is 38.5N/mm. For base isolation of an ordinary wooden house, 12 ∼ 16 sliding bearings and 4 ∼ 6 laminated rubber bearings are used. If the mass of a wooden house is 40ton and it is supported by 16 sliding bearings of the coefficient of friction of 0.046 and attached by 4 laminated rubber bearings with the horizontal stiffness of 38.5 N/mm, therefore it has 0.249 of the equivalent damping factor and 3.2 second of the natural period. As for the base isolated houses which are used this system, 500 houses have been constructed in Japan currently by the August of 2002 (Takahashi, 2002). As an advanced system of this base isolation system, we have developed a new type of the base isolation system of sliding bearing using silicone lubrication materials and rubber spring devices.
In this paper, time history response analysis considering the multicyclic characteristics of the isolation devices by the simplified method is performed using the long period ground motion for each target area due to Nankai Trough Earthquake. Moreover, time history response analysis of changing the arrangement of the isolation devices is performed in order to investigate the differences in the response characteristics of the base-isolated buildings, and attention points for aseismic design are indicated. In addition, the behavior of the collision to retaining wall is confirmed in the case where large deformation occurs in an isolation story.
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