| Project/Area Number |
18360271
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Kobori Research Complex, Research and Technology Development Division, Kajima Corporation |
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Principal Investigator |
TAKENAKA Yasuo Kobori Research Complex, Research and Technology Development Division, Kajima Corporation, Kobori Research Complex, Research and Technology Development Division, Kajima Corporation, Assistant Director (20416853)
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| Co-Investigator(Kenkyū-buntansha) |
KONDO Ahikiro Kajima Corporation, Kobori Research Complex, Research and Technology Development Division, Senior Research Engineer (50416872)
TAKAOKA Eiji Kajima Corporation, Kajima Technical Research Institute, Research and Technology Development Division, Senior Research Engineer (30416771)
HIKITA Makiko Kajima Corporation, Kajima Technical Research Institute, Research and Technology Development Division, Research Engineer (20443731)
KITAMURA Haruyuki Tokyo University of Science, Department of Architecture, Faculty of Science and Engineering, Professor (20339112)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥12,160,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥10,600,000 (Direct Cost: ¥10,600,000)
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| Keywords | Base Isolation / Long-period Ground Motion / Lead Rubber Bearing / High-damping Rubber Bearing / Tempreture Increase / Heat Transfer Analysis / Different Method / Earthquake Response Analysis / 動的加振実験 / 履歴復元力特性 |
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| Research Abstract |
Base-isolaton devices attached to base-isolated buildings can be subjected to larger and more cyclic deformation than anticipated due tolong-period ground motion caused by strong earthquakes in oceanic trenches. The seismic energy absorbed by the lead rubber bearings(LRBs) and high damping rubber bearings(HDBs) is fundamentally transformed into thermal energy. This leads to heat generation, which causes high temperatures in the lead plug and the high-damping rubber. The deterioration of damping characteristics and the increase of response values for base-isolated buildings in line with rising temperatures are serious concerns. In this paper, to clarify the effects of heat behaviors of base-isolation devices subjected to larger and more cyclic deformation, analytical and experimental studies were conducted. Following items were earned out or developed : (a) response characteristics of base-isolated buildings subjected to long-period ground motion ; (b) loadong tests on LRBs and HDBs considering larger and more cycbc deformation ; (c) a heat transfer analysis method of rubber bearings by apptying the forward difference method ; (d) an earthquake response analysis method of base-isolated buildings considering heat-mechanics interaction behavior. The summary of the results is shown below.
1. A lot of experimental data were obtained about changes of temperature and hysteresis charactenstcs on the base-isolation devices subjected to larger and more cyclic deformation.
2. Estimation methods for earthquake response values of base-isolated buildings considering heat-mechanics interaction behaviors of the rubber bearings were developed.
3. It was found that effects of temperature increase should not be ignored if charactenstics of earthquake motions accord to those of base-isolated buildings, which was a notable problem for base-isolated buildings on important use.
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