International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
권호 표지

Experimental Investigation of Column-to-Footing Connections for High-Strength Vanadium Steel Concrete Filled Tube Construction

Kingsley, Angela;Williams, Travis;Lehman, Dawn;Roeder, Charles

  • Published : 20051200
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Abstract

High-strength steel structural members can offer significant economic advantages compared to normal strength steel by reducing the material required to obtain a specific resistance. However, reduced sections can be susceptible to local instability and result in increased deflections. In concrete-filled tube (CFT) construction, these concerns are minimized in that the full tensile strength of the steel can be utilized while the concrete fill restrains buckling of the tube and reduces member deflections. Despite the improved structural performance that CFT construction may offer over steel or reinforced concrete alone, use of CFT elements as flexural members is limited in the United States, because connection designs are still in development. A research study at the University of Washington was undertaken to develop reliable base connections for CFT columns for a wide range of applications. The research investigates the performance and constructability of embedded-type CFT columnconcrete footing connections with slender tubes of high-strength steeL A parametric study was conducted to determine the influence of the primary connection parameters and the test variables. Three columns were constructed and tested to evaluate the influence of the embedment depth and vertical reinforcement in the footing. The results show that shallow embedment depths may result in significant resistance and deformation capacities but result in severe damage to the footing at higher drift levels and subsequent deterioration in the system performance. Increasing the embedment depth reduces the local demand in the footing which allows the system to sustain large inelastic deformation demands.

Keywords

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