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State of Practice for Positive Moment Connections in Prestressed Concrete Girders Made Continuous |
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| Authors: | Makarand Hastak Amir Mirmiran Richard Miller Ronak Shah Reid Castrodale |
| Affiliation: | 1Assistant Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN?47907-1294. 2Professor, Dept. of Civil Engineering, North Carolina State Univ., Raleigh, NC. 3Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, Cincinnati, OH?45221-0071. 4Construction Manager, Pacific 17, Roswell, GA. 5Associate and Senior Engineer, Ralph Whitehead Associates, Charlotte, NC. |
| Abstract: | Precast bridges are often constructed as single span for dead load, but continuous for live load. A diaphragm connection is provided for negative moment continuity. However, the connection may also be subjected to positive moments due to time-dependent effects. Because these moments may be large enough to damage the diaphragm or even the girders, a positive moment connection is often provided. This paper reports on a study to determine the types of positive moment connections used across the country and to identify potential problems with these types of connections. A questionnaire survey was conducted to assess the state of practice for precast prestressed concrete bridges made continuous. The survey provides valuable information on this type of bridge and updates a previous survey on this subject. |
| Keywords: | Bridges, concrete Concrete, prestressed Continuous structures Concrete, precast Connections |