Elisian Viaduct, Los Angeles, California, USA

This bridge featured an old design concept of steel girders supported by concrete pier cap beams. The new retrofit design specified extensive use of bar tendons throughout the entire structure.
The cap beam width was increased by adding new concrete on both sides. Transverse Ø32 mm DYWIDAG Bars (THREADBAR^®) connected new concrete to old. Steel girder stability was increased by adding special spreader beams bolted to the existing webs at several locations. Spreader beams placed in pairs were connected with an external restraint made of Ø32 mm bars (THREADBAR^®).