Durable UHPC Columns with High-Strength Steel
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2019-04-01
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Edition:Final Report 08/2017-05/2019
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Abstract:Ultra-High Performance Concrete (UHPC) is a versatile building material as it is characterized by very high compressive strengths reaching 200 MPa (30 ksi), ductile tensile characteristics, and energy absorption. Currently, UHPC is commonly used in small structural applications, such as joints and connections between precast structural elements. However, this material is not widely used in structural elements due to the lack of knowledge of the structural behavior and failure mechanism of these elements. Due to the exceptional mechanical properties of UHPC, compact substructure elements cross-sections can be achieved if properly designed, which make this solution very suitable for accelerated bridge construction (ABC) construction where lighter and easier-to-handle and transport bridge components can be pre-fabricated and shipped to the site. There is also a great potential for application of UHPC in bridge members with high durability requirements in aggressive environmental conditions. To realize new bridge column designs using UHPC, the goal of this project was to use extensive experimental testing to first investigate the confinement behavior of UHPC and study the structural and seismic behavior of UHPC columns subjected to combined axial and lateral loading. Large number of UHPC cylinders with various spiral steel confinement were tested to determine the change in the compression strength and ultimate strain due to confinement effects. However, the main part of the experimental program included four large-scale UHPC column that were tested under axial and quasi-static cyclic lateral loading at the Earthquake Engineering Laboratory at the University of Nevada, Reno. The lateral response of these columns was evaluated for damage progression, failure type, peak strength, and displacement and curvature ductility. The four columns varied in longitudinal and transverse steel reinforcement where conventional Grade 60 and Grade 100 high strength steel were used. The study showed that with proper reinforcement design, the strength of UHPC columns can be almost double that of the conventional concrete columns without compromising on the displacement capacities or curvature ductility.
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