Affiliation:
1. Federal Highway Administration, U.S. Department of Transportation, 6300 Georgetown Pike, McLean, VA 22101.
Abstract
The use of prefabricated concrete bridge deck components can offer many advantages over conventional cast-in-place construction techniques. However, completing the overall bridge system requires the installation of connecting elements. The state of the practice for these connecting elements has been deficient in resilience, durability, and ease of construction. An ongoing research effort at FHWA, in conjunction with partners from the New York State and Iowa Departments of Transportation, is focused on engaging the advantageous properties of ultra-high-performance concrete (UHPC) to develop a new type of detail applicable to deck-level connections between prefabricated modular bridge components. This physical testing program investigated the structural performance of a field-cast UHPC connection under repeated truck wheel loading. The connection—150 mm (5.9 in.) thick and 152 mm (6 in.) wide—was designed as a noncontact lap splice with straight 16M (No. 5) steel reinforcement. After more than 11 million structural-loading cycles at progressively increasing load levels, individual bars within the connection began to fail in metal fatigue. The stress range in the reinforcement at initial fatigue failure was conservatively estimated at 197 MPa (28.6 ksi). No debonding or slippage of reinforcement was observed. The performance of this connection detail demonstrated the types of details that can be developed and deployed with field-cast UHPC.
Subject
Mechanical Engineering,Civil and Structural Engineering
Reference5 articles.
1. GraybealB. Behavior of Field-Cast Ultra-High Performance Concrete Bridge Deck Connections Under Cyclic and Static Structural Loading. NTIS PB2011-101995. National Technical Information Service, U.S. Department of Commerce, Nov. 2010, 106 pp.
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19 articles.
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