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Geosynthetic Reinforced Soil Walls As Integral Bridge Abutment Walls
The first use of geosynthetic reinforced soil walls for integral bridge abutment construction in North America occurred on the Greenville Southern Connector (I-185) toll road in 1999. A second bridge with a longer span and higher loads was constructed in 2000 for the same project. Each of these four bridge abutment walls were constructed over 20 ft. (6 m) high using modular concrete block wall (MCBW) facing units and geosynthetic reinforcement with a silty fine to medium sand backfill around vertically driven steel "H-Pile" foundation elements. While the piles were designed to carry all the vertical live and dead bridge loads, the lateral loads due to momentum, braking, and thermal movement would be transferred through the integrally cast-in-place concrete abutment to the piles to the wall facing elements through the piles, located just 3 ft. (1 m) behind the MCBW facing, and resisted by the geosynthetic reinforcement within the abutment wall. This paper describes the engineering analysis, design procedures, and some of the installation details utilized for these geosynthetic reinforced Mechanically Stabilized Earth Walls (MSEWs) with MCBW facing for the traditional retaining wall loadings, plus the additional procedures to account for the pile induced lateral loads. The design procedures were based on the prevailing guidelines at the time, the 1996 AASHTO "Standard Specifications for Highway Bridges" as revised in 1998. Lateral loads were apportioned to the wall facing and geosynthetic reinforcement using "P-Y" curves for laterally loaded piles developed by Reese & Matlock. Seismic loadings were addressed by pseudo-static procedures. A review of the performance of these geosynthetic walls based on deformed shape measurement of the wall facing after ten years of service is also presented to begin to assess their performance.
Geosynthetic Reinforced Soil Walls As Integral Bridge Abutment Walls
The first use of geosynthetic reinforced soil walls for integral bridge abutment construction in North America occurred on the Greenville Southern Connector (I-185) toll road in 1999. A second bridge with a longer span and higher loads was constructed in 2000 for the same project. Each of these four bridge abutment walls were constructed over 20 ft. (6 m) high using modular concrete block wall (MCBW) facing units and geosynthetic reinforcement with a silty fine to medium sand backfill around vertically driven steel "H-Pile" foundation elements. While the piles were designed to carry all the vertical live and dead bridge loads, the lateral loads due to momentum, braking, and thermal movement would be transferred through the integrally cast-in-place concrete abutment to the piles to the wall facing elements through the piles, located just 3 ft. (1 m) behind the MCBW facing, and resisted by the geosynthetic reinforcement within the abutment wall. This paper describes the engineering analysis, design procedures, and some of the installation details utilized for these geosynthetic reinforced Mechanically Stabilized Earth Walls (MSEWs) with MCBW facing for the traditional retaining wall loadings, plus the additional procedures to account for the pile induced lateral loads. The design procedures were based on the prevailing guidelines at the time, the 1996 AASHTO "Standard Specifications for Highway Bridges" as revised in 1998. Lateral loads were apportioned to the wall facing and geosynthetic reinforcement using "P-Y" curves for laterally loaded piles developed by Reese & Matlock. Seismic loadings were addressed by pseudo-static procedures. A review of the performance of these geosynthetic walls based on deformed shape measurement of the wall facing after ten years of service is also presented to begin to assess their performance.
Geosynthetic Reinforced Soil Walls As Integral Bridge Abutment Walls
Simac, Michael R. (author) / Elton, David J. (author)
Earth Retention Conference (ER) 2010 ; 2010 ; Bellevue, Washington, United States
Earth Retention Conference 3 ; 604-611
2010-07-26
Conference paper
Electronic Resource
English
Geosynthetic Reinforced Soil Walls As Integral Bridge Abutment Walls
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