Our specialty in designing concrete bridges includes prestressed concrete girder or cast-in-place concrete bridges depending on the site conditions and the spanning requirements for the structure. Past projects have included freeway interchanges, waterway over-crossings and spans over terrain that requires a bridge. We are experienced with single or multi-span bridges. The primary requirements for design are specified in the current American Association of State Highway and Transportation Officials (AASHTO) for these structures.
The selection and design of steel bridges are generally specified when the use of a more economical concrete bridge cannot be utilized. Specifying a steel bridge will generally be required when constructability issues dictate the need. This is typically when the site will likely require a longer span girder section, or when launching or setting the girders only allow for a steel section. The primary requirements for design are specified in the current American Association of State Highway and Transportation Officials (AASHTO) for these structures.
Many times the full replacement of an existing bridge is not the most economical solution, and the retrofit of the bridge becomes the recommended alternative. Many times this occurs when the bridge has historical significance and the desire is to restore it to its original constructed condition with the consideration for newer design loadings including resistance to seismic loads. Our team is experienced retrofitting bridges including bridges that are registered with the National Register of Historic Places.