| Budget Amount *help |
¥3,590,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥90,000)
Fiscal Year 2007: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Research Abstract |
In SIMOUMEDA bridge (two span steel composite girder bridge) at Shiwa town of the Iwate Prefecture, three real bridge loading tests were executed between 2005 and 2007 fiscal years. In static loading test by 15tf and 20tf track done in the measurement span and the adjacent span of the object bridge, the strain and the displacement of main each girder over the entire two span were measured, and local strains of the shoe neighborhood web and the sole plate neighborhood of the girder edge were measured in the multipoint. By the comparative study of those results and the FEM analytical results, it was understood that the compression strain was generated over the wide range from the shoe if the horizontal movement restraint is done in movable end and complex states of the stress of the end neighborhood almost were clarified. Moreover, horizontal displacements of the pier point were measured with displacement sensors and a rotation angle of shoe or a angle of gradient of pier is measured wit
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h a high resolution tiltmeter during loading test. From the results, it was understood that rotation angles of shoes were generated though shoes were restrained and that the middle pier moved horizontally at static and dynamic loadings.
Next, by doing the microtremor measurement, the track test run, the sandbag fall examination, and the real operational examination in the dynamic loading test, and making comparative study of those examination results and FEM analytical results, it has been understood to clarify the bridge under use has natural frequency different from the state of no looding, and to give a big influence the shoe restraint and the the horizontal displacement of the middle pier to natural frequency and dynamic behavior of two span steel composite gierder bridge.
Moreover, it proposed the technique for presuming the weight of running vehicle by converting a dynamic strain response curve of shoe neighborhood into a static curve by using the moving average method, and by using the reverse-analysis, and the practicality was confirmed. It proposed simple health evaluation method for judging the restraint condition at movable shoes and the deterioration level of passing year at the floor slab of existing steel composite girder bridge at the same time by using a basic natural frequency obtained from dynamic loading test and a measurement value of strain at shoe neighborhood obtained from static loading test. It applied to one span or two span steel composite girder bridges, and the validity of the proposal technique was confirmed. Less
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