Proposed Refinements to Design Procedures for Geosynthetic Reinforced Soil (GRS) Structures in AASHTO LRFD Bridge Design Specifications (2019) / Chapter Skim
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1 SUMMARY Proposed Refinements to Design Procedures for Geosynthetic-Reinforced Soil (GRS) Structures in AASHTO LRFD Bridge Design Specifications NCHRP Web-Only Document 260 is an adaptation of Chapter 8 of the Contractor's Final Report for NCHRP Project 24‐41, "Defining the Boundary Conditions for Composite Behavior of Geosynthetic Reinforced Soil Structures," which discusses proposed design refinements for Section 11.10 of the AASHTO LRFD Bridge Design Specifications.
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2 A comprehensive summary of the state‐of‐the‐practice was compiled to document the characteristics of the various components of geosynthetic‐reinforced soil bridge abutments constructed worldwide. This is a type of structure for which closely‐spaced reinforcement has often been adopted.
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3 pressures, lateral wall facing deflections, and strains of primary and secondary geogrids, respectively. A reevaluation was conducted of the collected data with focus on the effect of vertical spacing.
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4 of this study to assess additional aspects of geosynthetic‐reinforced soil behavior. Accordingly, this study included the compilation of a large volume of data generated by testing geosynthetic‐ reinforced soil models in geotechnical centrifuges, from which a portfolio was created of centrifuge data on geosynthetic‐reinforced soil structures, with an emphasis on data in which reinforcement vertical spacing was varied.
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5 The experimental component of this study included the development of a new device to comprehensively assess the soil‐reinforcement composite interaction under both working stress and failure conditions. This new equipment was able to assess the mechanical behavior of a geosynthetic‐reinforced soil mass considering varying reinforcement vertical spacings.
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6 between the stress and strain distributions anticipated within the primary and bearing bed zones (i.e. zones with different vertical reinforcement spacing)
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7 the impact of the stiffness/spacing ratio depends on the dominant internal stability mechanism (i.e. reinforcement pullout or breakage)
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8 for the case of structures designed using the same vertical reinforcement spacing and reinforcement design strength in the entire height of the GMSE structure. 2 Effect of vertical spacing on the magnitude and distribution of connection loads: A uniform distribution of reinforcement connection load with depth is recommended for GMSE structures with closely‐spaced vertical reinforcement.
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