The in-service performance of many bridges built on the Geosynthetic Reinforced Soil (GRS) Integrated Bridge System (IBS) indicate the superstructure and approach fill coexist to maintain a smooth, bump-free transition without the need to include a traditional approach slab or special pavement system. This project will investigate the interaction between the end of different super-substructure combinations and a GRS integrated approach. The project will involve a series of laboratory experiments and computer modeling to simulate thermal bridge cycles and measure the resulting passive earth pressure against the GRS integrated approach in an attempt to understand the interaction with the integrated approach that can be applied to the IBS and other systems.
The key project objectives are:
(1) Define the mechanics of passive earth pressure against a geosynthetic reinforced soil (GRS) integrated approach.
(2) Define the interaction between the superstructure and abutment.
(3) Determine how the thermally induced force from the approach backfill affects the superstructure.
(4) Develop a computer model to simulate the GRS integrated approach for different bridge configurations
(5) Apply the results of this work to the design of bridges with various abutment types (e.g. GRS, integral, etc.).