| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 91 === The main idea of this research is to show the concrete-filled steel tube (CFT) which is forced by the constant loading would have the acts of the monotonic and cyclic moments that based on the fiber element analysis, and further more; comparing the analytic results and the experimental dates to obtain more information. We can understand more from figuring out how much the concrete works to confine the steel tubes by anatomizing the relations between the CFT and the external force, and we could comprehend the influence of the mechanics behavior on the steel tubes after buckling.
According to the analysis, when the specimen is affected by the moment, the pressured-side of the specimen is easier into “steel tube-bucking”, especially the non-enhanced rectangle section. Next, the simulated parameters, 、 and are discussed with the fiber element analysis. The parameter is the concrete-confined factor (the strength of concrete %), the parameter is the tube buckling strain, and the parameter is the ratio of the modulus of buckling to the modulus of elasticity. Subsequently, the confined factor has increased with the effect of the section enhancing, and also the buckling of the steel tube happens in advance with the ratio of the loading to the raising one. The ratio of the modulus of buckling to is changing with the different enhancement of the specimen’s section; the K of the non-enhanced rectangle section is bigger, and the buckling is more obvious; on the contrary, the well-enhanced specimen has a less value of K and is unapparent buckling.
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