US-281 Bridge over the Colorado River. Marble Falls, Texas
Services Provided by FINLEY:
- Bridge Design (Redesign Of Segment Lengths) And Construction Engineering
- Preparation Of Integrated Shop Drawings
- Falsework And Temporary Works Construction And Geometry Control
- Design And Detailing Of Temporary Works
- Construction And Geometry Control Manuals
- Stressing Data For The Post-Tensioning Tendons
- Design Office Support During Construction
Estimated completion date:
Slow Motion Bridge Demonition:
Specifications & Details
The Texas Department of Transportation has set aside almost $28.65 million to replace the Lake Marble Falls bridge with two new bridges. Population growth in Burnet County, coupled with inefficiencies, are the driving forces behind the construction plan. Increased traffic flow is the main goal of this four year construction project that calls for two new bridges, one to serve northbound traffic and the other to serve southbound traffic.
The new bridges are twin segmental bridges with a main span of 410-ft. The bridges are each 3-span variable depth cast-in-place segmental structures. The spans of the bridge are 274’-0”, 410’-0”, and 274’-0”, with a bridge deck width of 47’. The structure is being built utilizing the balanced cantilever construction method with end spans constructed on falsework. The box depth varies from 23’-0” at the interior piers, to 9’-6” at the end spans, and a variable superelevation up to 5.5%.
FINLEY services includes: bridge design (redesign of segment lengths and post-tensioning) and construction engineering; preparation of integrated shop drawings; design and detailing of temporary works; falsework and temporary works construction and geometry control manuals; stressing data for the post-tensioning tendons; and design office support during construction. FINLEY performed a time-dependent staged analysis of the structure to monitor stresses and anticipated deflections during construction, revised the segment layout and optimized the post-tensioning, which reduced costs and construction time. FINLEY’s analysis included a model using Bridge Information Modeling (BrIM) which allowed the synchronization of the CADD shop drawings with the analysis model, to produce the details quickly to meet the contractor’s fast-pace construction schedule.
The first bridge was completed in March 2013. The second bridge is expected to be completed in 2014.