Basic Behavior of Centrifugal Hollow Concrete-filled Steel Tube (H-CFST) Stub Columns under Axial Compression

다국어 초록 (Multilingual Abstract)

High-strength steel structural members can offer significant economic advantages compared to normal strength steel bytyand result in increased deflections. In concrete-filed tube (CFT) construction, these concerns are minimized in that the fulltensile 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 ofer over steel or reinforced concrete alone, use ofCFT elements as flexural members is limited in the United States, because connection designs are stil in development. Aresearch study at the University of Washington was undertaken to develop reliable base connections for CFT columns for aconcrete footing conections with slender tubes of high-strength steel. A parametric study was conducted to determine theinfluence of the primary connection parameters and the test variables. Three columns were constructed and tested to evaluatethe influence of the embedment depth and vertical reinforcement in the footing. The results show that shallow embedmentdepths may result in significant resistance and deformation capacities but result in severe damage to the footing at higher driftthe footing which allows the system to sustain large inelastic deformation demands.

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