2012 Fiscal Year Final Research Report
Evaluation of safety and the collapse mechanism caused by sudden failure of members in truss bridges
| Project/Area Number |
22560490
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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 |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Toyota National College of Technology |
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Principal Investigator |
KAWANISHI Naoki 豊田工業高等専門学校, 環境都市工学科, 准教授 (60300589)
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| Project Period (FY) |
2010 – 2012
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| Keywords | トラス橋 / リダンダンシー / 衝撃係数 / 進行性破壊 |
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| Research Abstract |
The dynamic stress amplification resulting from a sudden failure of a member has a considerable influence on a progress to the overall collapse. Therefore, this dynamic effect must be included in the conventional static redundancy analysis as an impact factor. The calculated values of the impact factor vary widely from member to member. However, the impact factors for critical members in the redundancy analysis take almost a constant value that ranges from 1.4 to 1.8. In order to predict approximately the magnitude of the member impact factors without carrying out the dynamic response analysis, a simplified method based on the RMS mode combination method is proposed. The accuracy of the member impact factors calculated by this simplified method is moderate.
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