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(Now that the project has proven successful, PRHTA is ready to implement the technology in a broader manner and in bridges of greater spans.) Second, PRHTA could use void slabs (pre-stressed elements with longitudinal circular voids) directly on top of the GRS-IBS, eliminating the need to cast a concrete leveling pad.
To obtain funding for the project, PRHTA submitted a request for consideration under FHWA's Innovative Bridge Research and Deployment Program, which awarded the agency a $370,000 grant.
As part of the implementation of GRS-IBS technology, PRHTA coordinated a workshop with FHWA to introduce the technology to the Puerto Rican staff, consultants, contractors, and suppliers.
PRHTA used this spreadsheet as the basis for design of its GRS-IBS structures.
PRHTA added a graphic interface to help users understand the input and output data.
Because the spreadsheet considered only static loading, PRHTA modified it to include AASHTO seismic criteria.
PRHTA added the stability criteria as a method of preliminary assessment of the external stability of the GRS before entering the model into a slopes stability analysis program.
PRHTA developed Special Provision 983--Geosynthetic Reinforced Soil Integrated Bridge System in coordination with the FHWA Resource Center.
PRHTA also developed another document, Special Provision Specification 975--Bridge Monitoring and Instrumentation System, for the instrumentation and monitoring of the bridges using fiber-optic sensor technology.
Bridge 1121, the second bridge PRHTA replaced, was instrumented with 20 pressure cells (10 on each abutment in the GRS mass) to measure the superstructure's vertical pressure distribution, and 16 geosynthetic fiber-optic sensors (8 on each abutment) in the integration zone and GRS mass) to measure stresses and strains.
Since the bridges do not cross water, PRHTA officials decided in the design stage to use a well-graded, rather than an open-graded, backfill for the GRS-IBS structure.
From the start of the construction process, the contractor and PRHTA inspection personnel noticed that the concrete blocks for the abutments tended to move forward when the compaction roller was in use.
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- PRI Act
- PRI Act
- PRI LVL
- PRI Modem
- PRI TGT
- Priacanthus arenatus