| Budget Amount *help |
¥16,740,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2007: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2006: ¥10,500,000 (Direct Cost: ¥10,500,000)
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| Research Abstract |
Performance-based Limit State Design Method (PB-LSD) for designing structural members for infrastructure is now global standard. In Euro Code (EU) and AASHTO LRFD (USA), after 20-year energetic activity, the shift of design concept from Allowable Stress Design (ASD) to PB-LSD has just finished. Among Asian countries, where future preparation of infrastructure is expected and also are expected to be promising market, the above codes are now becoming popular. In Japan, for more than 30 years, ASD has been used. On designing composite girders, which is competitive structural members, and has been employed worldwide, in order to effectively utilize its mechanical characteristics, introduction of LSD is inevitable. From a viewpoint of competing with EC (EU) and AASHTO LRFD (USA), a shift from ASD to LSD has to be done immediately. In this research, based on analytical and experimental studies, original and competitive formulae for evaluating ultimate flexure, shear and interactive strength for composite girders were proposed, which are the most important items on establishing competitive LSD. On evaluating flexural strength, the criterion for judging to be compact section gives the most economical section. Regarding ductility condition taking into account of the decrease of plastic moment due to concrete crushing, the most competitive solution was given. On evaluating flexure and shear interactive strength, it was found that the interaction effect can be neglected in case of composite girders. In case of steel girder (under erection), it has to be checked. Original provisions were also proposed on checking serviceability limit state. Furthermore, the design method for double-composite girders and composite hybrid girders was also proposed.
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