| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 87 === The advantages of hollow bridge columns are material savings and lighter mass. Therefore, more and more bridge columns have hollow cross-sections. The flexural behavior of hollow bridge columns has been studied last year. The purpose of this research is to investigate the shear behavior of such columns. In the analyses, all nine models for the stress-strain relationship of confined concrete are taken into account to develop a computer program, so that the load-displacement relationship can be predicted. With regard to the test program, the parameters are amount of lateral steel in plastic hinge region, axial force and moment arm. Totally six specimens were tested to investigate the shear behavior and to examine the analytical models.According to the test data and analytical results, shear failure may easier occur when insufficient lateral steel and large axial force are provided.
With regard to the evaluation of shear capacity of hollow bridge columns, UCSD provides the best predictions when compared to the tests. In addition, the deterioration of shear resistance of concrete suggested by UCSD is also in good agreement with the tests. Out of nine models, both Modified Kent and Park model and Sheikh and Uzumeri model provides the best results. Finally, both softening coefficient and deterioration of shear resistance of concrete are also examined. However, more research in this area is needed.
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