T310: The majority of bridges in the U.S. are built with precast, prestressed concrete. Excellent durability and structural performance over the long term and low cost in the short term have encouraged owners and designers to find methods to extend the span ranges of typical girder shapes and to develop new shapes to satisfy more applications. Many methods to accomplish longer spans have been developed. Many of these are becoming almost commonplace today. A brief history of traditional span ranges is reviewed as are the many benefits of longer-span applications. Methods and materials resulting in longer spans is discussed as are their implications for fabrication and construction.

After completing this course, the student will be able to:

• Recall reasons for historical span limitations
• Recognize the benefits of longer spans
• Recognize advancements that have allowed span lengths to increase dramatically
• Identify methods being used to build long bridge spans with precast concrete
• Examine the significance of common methods used to extend spans
• Recognize the implications for fabrication and construction when employing these methods