Seismic Behavior of Posttensioned Concrete-Filled Fiber Tubes |
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Authors: | Mohamed ElGawady Aaron J. Booker Haitham M. Dawood |
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Affiliation: | 1Assistant Professor, Civil and Environmental Engineering Dept., Washington State Univ., WA (corresponding author). E-mail: melgawady@wsu.edu 2Staff Engineer, Kiewit Corporation, 3555 Farnam St., Omaha, NE 68131; formerly, Graduate Student, Civil and Environmental Engineering Dept., Washington State Univ., WA. E-mail: ajbooker@wsu.edu 3Research Assistant, Civil and Environmental Engineering Dept., Washington State Univ., WA. E-mail: hmousad@msn.com
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Abstract: | Precast segmental construction technique is an excellent candidate for economic rapid bridge construction in highly congested urban environments and environmentally sensitive regions. This paper presents the seismic behavior of four hybrid segmental columns consisting of precast posttensioned concrete-filled fiber tubes (PPT-CFFTs). A fifth monolithic column was also tested as a reference specimen. The columns were tested under increasing lateral loading cycles in a displacement control. The columns had circular cross section diameters of 203 mm and heights of 1,524 mm each. The parameters investigated included different construction details and energy dissipation systems. The PPT-CFFT columns developed lateral strength and deformation capacity comparable to those of the monolithic reinforced concrete column. However, the PPT-CFFT columns dissipated smaller hysteretic energy compared to that of the monolithic reinforced concrete column. Finally, a simple model was used to predict the backbone curves of segmental columns. The model was conservative and it predicted approximately 75% of the measured ultimate strength and displacement. |
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Keywords: | Columns Ductility Seismic effects Fiber reinforced polymer Tubes Bridges Connections Post tensioning |
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