| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
The aim of this research is to elucidate damage and failure of transmission towers due to foundation displacement caused by ground deformations, such as earthquake-induced settlement and landslides. Development of a proper guideline to evaluate the soundness of transmission towers subjected to foundation displacement is of utmost engineering importance. A series of finite element analysis has been conducted to examine buckling failure and yielding in the members and the strength of whole structural system under an increasing live load and imposed foundation displacement. The degree of damage and the residual strength of the tower were assessed by a live load factor. The analysis result has revealed that the ultimate strength tended to decrease significantly when the foundation displacement exceeded a certain value, while reduction of structural strength was quite different depending on the live load varying with seasons as well as the support condition by footing and ground properties.
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