| Budget Amount *help |
¥15,340,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥3,540,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Outline of Final Research Achievements |
Fixed point load fatigue tests (four points bending tests) and the moving load fatigue tests (wheel load driving tests) on I-section girder specimens with web-gusset welded joints have been per-formed in order to make clear the stress properties, fatigue crack initiation and propagation behavior from the weld toe of the joint, and the fatigue strength under variation in principal stress direction. The test results suggested that the positions along weld toe in which the largest major principal stress occurs gradually changes by the load position, the fatigue strength under moving loads is lower around 20 to 30% than the strength under the fixed point loads, fatigue crack extending along the weld toe is long compared with that in fixed point loads, and the fatigue crack after leaving from the weld toe propagates in more inclined direction compared with the direction perpendicular to the principal stress one.
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