| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 105 === Previous short column tests show that the so-called combined tie is able to provide noticeable confinement to the outskirt concrete. in this study, encased concrete-filled steel box column specimens are tested under prescribed cyclic loading to investigate the effectiveness of the combined tie on the ductility of the encased concrete-filled box columns. Width-to-thickness ratio is the main parameter in this study, base on the test results, the ratio is proposed to be smaller than 37:
Elastic analysis results shows that: (1) In the elastic region, the stiffness of the combined ties is related to the width-to-thickness ratio.
Experimental results shows that: (1) Combined tie is effective to be used in the design.(2) In providing confinement to concrete, the combined tie has a similar function to the tie used in the reference specimen. (3) In this experiment, the ductility of concrete-filled steel box columns is not significantly affected by the width-to-thickness ratio. (4) For a conservative design, the diameter of supplementary longitudinal reinforcement must not be smaller than 1/6 times the hoop spacing.
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