Behavior Comparison of Prestressed Channel Girders from High-Performance and Ultrahigh-Performance Concrete
| Autor: | Mark P. Manning, Brad D. Weldon, Michael J. McGinnis, David V. Jáuregui, Craig M. Newtson |
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| Rok vydání: | 2016 |
| Předmět: |
050210 logistics & transportation
Materials science business.industry Mechanical Engineering 05 social sciences 020101 civil engineering 02 engineering and technology Structural engineering Bridge (interpersonal) Durability 0201 civil engineering Compressive strength Flexural strength Girder 0502 economics and business Ultimate tensile strength business Ductility Reinforcement Civil and Structural Engineering |
| Zdroj: | Transportation Research Record: Journal of the Transportation Research Board. 2577:60-68 |
| ISSN: | 2169-4052 0361-1981 |
| DOI: | 10.3141/2577-08 |
| Popis: | In response to the demand for sustainable and improved bridge design practices, the development of emerging materials like ultrahigh-performance concrete (UHPC) is at the forefront of structural innovation. UHPC offers significant advantages to bridge superstructure design as it provides advanced mechanical and durability properties, including high compressive strength and increased tensile capacity. With the introduction of high-strength steel fibers into mixture proportions, postcracking tensile and flexural tensile capacities are increased. These increased tensile capacities provide greater ductility and reduce or possibly eliminate the need for mild steel reinforcement. The present research investigated the behavioral response of full-scale prestressed bridge girders subjected to four-point flexural loading. Two channel-shaped girders were designed to provide equal design moment capacities to facilitate comparative analyses of performance. The first of these girders was designed with high-performance concrete [HPC; 9.5 kips per square inch (ksi; 66 MPa)] and mild steel reinforcement typical of that used in New Mexico bridge designs. The second girder used nonproprietary UHPC [20 ksi (138 MPa)] mixture proportions consisting primarily of local materials, local mixing procedures, and a local curing regimen, all of which were developed at New Mexico State University, Las Cruces. Digital image correlation was used to capture deformations throughout the testing. This information creates a full field of displacements that captures tensile and compressive strain behaviors in the pure moment region. This investigation demonstrated the advantages and improved performance of UHPC and the contribution of steel fiber reinforcement to postcracking strength and flexural capacity. |
| Databáze: | OpenAIRE |
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