Performance Evaluation of a Multi-Span Geosynthetic Reinforced Soil-Integrated Bridge System (GRS-IBS)

2017 ◽  
Author(s):  
Ashley MacMillan ◽  
Joseph C. Goode ◽  
Martin Hawkes
Keyword(s):  
Performance Evaluation ◽  
Reinforced Soil ◽  
Geosynthetic Reinforced Soil ◽  
Bridge System

Comparison of Field Behavior with Results from Numerical Analysis of a Geosynthetic Reinforced Soil Integrated Bridge System Subjected to Thermal Effects

2020 ◽  
Vol 2674 (1) ◽  
pp. 294-306
Author(s):  
Arshia Taeb ◽  
Phillip S.K. Ooi
Keyword(s):  
Pressure Fluctuations ◽  
Axial Loading ◽  
Reinforced Soil ◽  
Element Analysis ◽  
Vertical Pressure ◽  
Geosynthetic Reinforced Soil ◽  
End Wall ◽  
Cyclic Straining ◽  
Toe Pressure ◽  
Bridge System

When subjected to ambient daily temperature fluctuations, a 109.5 ft-long geosynthetic reinforced soil integrated bridge system (GRS-IBS) was observed to undergo cyclic straining of the superstructure. The upper and lower reaches of the superstructure experienced the highest and lowest strain fluctuation, respectively. These non-uniform strains impose not only axial loading of the superstructure but also bending. Pure axial loading in a horizontal superstructure will cause the footings to slide. However, bending in the superstructure will cause the footings to rotate thereby inducing cyclic fluctuations of the vertical pressure beneath the footing and also lateral pressure behind the end walls. Measured vertical footing pressure closest to the stream experienced the greatest daily pressure fluctuation (≈ 2,500–3,000 psf), while that nearest the end wall experienced the least. The toe pressure fluctuations seem rather large. That these large vertical pressure fluctuations are observed in a tropical climate like Hawaii when no other GRS-IBS in temperate regions has reported the same (or perhaps higher fluctuation) is indeed surprising. The larger these pressures are, the greater the likelihood of inducing cyclic-induced deformations of the GRS abutment. A finite element analysis of the same GRS-IBS was performed by applying an equivalent temperature and gradient to the superstructure over the coldest and hottest periods of a day to see if the field measured values of pressures are reasonable and verifiable, which indeed they were. This methodology is novel in the sense that the effects of axial load and bending of the superstructure are simulated using measured strains rather than measured temperatures.

Full-Scale Testing of Geosynthetic-Reinforced, Soil-Integrated Bridge System

2017 ◽  
Vol 2656 (1) ◽  
pp. 40-52 ◽  
Author(s):  
Milad Saghebfar ◽  
Murad Y. Abu-Farsakh ◽  
Allam Ardah ◽  
Qiming Chen ◽  
Benjamin A. Fernandez
Keyword(s):  
Reinforced Soil ◽  
Full Scale ◽  
Geosynthetic Reinforced Soil ◽  
Bridge System ◽  
Full Scale Testing

Construction and Monitoring of Alabama’s First Geosynthetic Reinforced Soil-Integrated Bridge System

2019 ◽  
Author(s):  
R. Jonathan Hogan ◽  
Robert Pirando ◽  
J. Brian Anderson ◽  
Jack Montgomery
Keyword(s):  
Reinforced Soil ◽  
Geosynthetic Reinforced Soil ◽  
Bridge System

Performance monitoring of Geosynthetic Reinforced Soil Integrated Bridge System (GRS-IBS) in Louisiana

2017 ◽  
Vol 45 (2) ◽  
pp. 34-47 ◽  
Author(s):  
Milad Saghebfar ◽  
Murad Abu-Farsakh ◽  
Allam Ardah ◽  
Qiming Chen ◽  
Benjamin A. Fernandez
Keyword(s):  
Performance Monitoring ◽  
Reinforced Soil ◽  
Geosynthetic Reinforced Soil ◽  
Bridge System

scholarly journals Evaluating the Performance of Geosynthetic Reinforced Soil-Integrated Bridge System (GRS-IBS) under Working Stress Condition

2019 ◽  
Vol 271 ◽  
pp. 02001
Author(s):  
Murad Abu-Farsakh ◽  
Allam Ardah ◽  
George Voyiadjis
Keyword(s):  
Strain Distribution ◽  
Reinforced Soil ◽  
Span Length ◽  
Linear Elastic ◽  
Geosynthetic Reinforced Soil ◽  
Working Stress ◽  
Spacing Ratio ◽  
Coulomb Model ◽  
Bridge System

This paper evaluates the performance of geosynthetic reinforced soil-Integrated Bridge System (GRS-IBS) in terms of lateral facing deformation and strain distribution along geosynthetics. Simulations were conducted using 2D PLAXIS program. The hardening model proposed by Schanz et al. [1] was used to simulate the behavior of backfill material; the backfill-reinforcement interface was simulated using Mohr-Coulomb model, and the reinforcement and facing block were simulated using linear elastic models. The numerical model was verified using the results of a case study conducted at Maree Michel GRS-IBS, Louisiana. Parametric study was carried out to investigate the effects of span length, reinforcement spacing, and reinforcement stiffness on the performance of GRS-IBS. The results indicate that span length have significant impact on strain distribution along geosynthetics and lateral facing deformation. The reinforcement stiffness has significant impact on the GRS-IBS behavior up to a certain point, beyond which the effect tends to decrease contradictory to reinforcement spacing that has a consistent relationship between the GRS-IBS behavior and reinforcement spacing. The results also indicate that reinforcement spacing has higher influence on the lateral facing deformation than the reinforcement stiffness for the same reinforcement strength/spacing ratio (Tf/Sv) due to the composite behavior of closely reinforcement spacing.

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