State Road 50 Bridge over State Road 436: Implementation of a Simple-Supported Steel Box Girder System

This intersection is one of the most highly traveled and congested intersections in Central Florida. The improvements include the widening of SR 50 and the construction of a bridge over SR 436. The resulting bridge contains a varied span arrangement due to a skewed approach of SR 436. Several superstructure and substructure alternatives were studied. Special aesthetics requirements, Traffic control restrictions, and the construction sequencing also impacted the evaluation of structure types. The use of simple spans reduced the complexity during construction by minimizing the impact on the traveling public. The bents for the bridge were placed normal to the roadway in order to simplify construction. The intermediate bents consist of an inverted T-cap section. This article will discuss the implementation of both the superstructure and substructure design types for this unique project. This includes the use of simply supported box-girders, post-tensioned post-tensioned inverted T-caps, simplified construction sequences, girder shipping lengths, and accelerated erection times.