|Bridges: Representative Special Bridge Related Projects/Research Projects|
DOR Single and Multiple Span Inverted Tee (IT) Standards Development
US Army Corps of Engineers’ Rapid Over-bridge Standard Design
The developed precast beams and ramps system are set on the damaged span over the existing superstructure and piers (or abutments). The proposed beams can be rapidly installed and assembled through transverse post-tensioning at the precast diaphragms. The novel curved top surface allows for considerable reduction of the length of the ramp generally required for the steel bridges with prismatic section. The bridge system is demonstrated for a 21.3 m (70 ft) span under heavy military loads. Each piece is limited in weight to about 12.7 metric tons (14 tons) and in depth to 0.9 m (3 feet). The on-site construction operation is minimized as no cast-in-place concrete or grout is required. As a removable bridge, the precast beams and ramps can be easily disassembled and reused. Despite the relatively complex precast component shapes, the cost of the formwork can be amortized over an extensive amount of production. This project focused on a simple-span replacement for any bridge width in increments of 0.6 m (2 ft). Although the system was designed for military applications as a substitute for prefabricated steel bridges, it has great potential for civilian applications.
National Cooperative Highway Research Program (NCHRP)
Federal Highway Administration (FHWA)
Precast/Prestressed Concrete Institute (PCI)
FHWA Generic Workshop HPC Bridge Design Module
Development and Validation Support for LEAP Software - LEAP Software is a bridge industry leader in the development of bridge engineering software. It is a highly visible company known to provide particularly reliable engineering software products. Over thirty State Departments of Transportation, the Federal Highway Administration, numerous local governmental entities, and most ENR top 500 consulting firms currently use LEAP’s software.
As a result of its special knowledge and skill in the area of precast/prestressed concrete bridge design, IS was retained by LEAP to support the continuing development and validation efforts associated with its specialized bridge design software. Over the past couple of years, TA has provided technical support on the following software programs:
Graduate Thesis – Implementation of the Inverted Tee Bridge System