Abstract
The chapter discusses the nonlinear analysis stress effects on the behavior of concrete-filled square steel tubular members. In the practical construction of concrete-filled square steel tubular structures, a square steel tube usually has some initial stresses before it works together with its core-concrete. This initial stress could affect the load-carrying capacity of the whole member. Based on tests and theoretical analyses, there are reports that address the importance of considering the influence of the initial stress. Some simplified formulae are also suggested in literature. The chapter presents a numerical investigation on the effect of initial stresses in a square steel tube on the behavior of a concrete-filled square steel tubular member using the non-linear finite element method. The investigation includes some parametrical studies, such as initial stress ratios. Results are compared with existing experimental data and published theoretical results. Recommendations on how to consider the effect in a design formula are also provided in the chapter.
Published Version
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