| Project/Area Number |
14550582
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Musashi Institute of Technology |
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Principal Investigator |
HAMAMOTO Takuji Musashi Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (10228546)
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| Project Period (FY) |
2002 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | Structural health monitoring / Vibration monitoring / Wave monitoring / Super-structure / Sub-structure / Seismic damage / Damage detection / System identification / 振動計測 / 上部・基礎構造連成系杭損傷 / 振動台実験 / 常時微動測定 / 地盤〜杭構造物相互作用 / 杭損傷 / 地盤〜構造物相互作用 / 地盤-構造物相互作用 |
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| Research Abstract |
Structural health monitoring technology has been mainly developed for super-structures of building system so far. This study is concerned with an integrated health monitoring of super- and sub-structures of building system.
In the case of multistory buildings, pile-supported building systems are selected as target structures. Seismic damage of pile foundations is identified from vibration monitoring of super-structure and near-field ground of building systems before and after earthquake events. A step-by-step system identification approach is formulated to estimate pile stiffness in the soil. A Penzien-type pile-soil-structure interaction model is used as a mathematical model. Experimental verification is performed to validate the identification scheme using a small-scaled experimental model. Field measurements of pile-supported real buildings are also carried out as feasibility studies. In addition, a local damage detection of pile foundations is developed using an integrated vibration
… More
and wave monitoring, which contains vibration generator test, impact hammer test, acoustic emission test and ultrasonic wave test. The experiment is carried out for real PHC piles.
In the case of large-span roof buildings, multi-supported truss dome systems are selected as target structures. A number of vibration sensors are distributed on the roof joints. A focusing strategy is proposed to detect damage from the overall systems. The first step is to judge whether damage occurs in the super-structure or sub-structure. If damage occurs in the sub-structure, the location and extent of sub-structure damage are estimated. If not, the damage region is searched for in the super-structure. If the damage region is isolated from the overall structures, then the location and extent of superstructure are estimated in the damage region. To validate the damage detection scheme, an small-scaled experimental model is fabricated and measured. In the experiment, three-directional sensors are introduced to identify the change in three dimensional mode shapes and tension-wire systems are used to isolate the damage region. Less
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