Preliminary Results for a GRS Integrated Bridge System Supporting a Large Single Span Bridge

Warren, Kimberly; Schlatter, Warren; Adams, Michael T.; Stabile, Thomas; LeGrand, D.

doi:10.1061/41128(384)63

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The specific requirements for the integrated approach are outlined in the most recent interim implementation guide for this technology (Adams et al, 2011a), and the details of the GRS IBS construction process for this bridge are outlined by Warren et al (2013) and Warren et al (2010). Based on on-going GRS IBS performance monitoring conducted by the FHWA, there is no requirement of an expansion joint or approach slab.…”

Section: Fig 1 Grs Ibs Constructed In Defiance Ohio (2009): (A) Dementioning

confidence: 99%

Three-Year Evaluation of Thermally Induced Strain and Corresponding Lateral End Pressures for a GRS IBS in Ohio

Warren

Whelan

Hite

et al. 2014

Geo-Congress 2014 Technical Papers

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Geosynthetic-Reinforced Soil (GRS) Integrated Bridge Systems (IBS) integrate conventional bridge superstructures with a GRS abutment foundation and GRS approach for a cost effective, rapid construction alternative. A 42.7 m long single span GRS IBS was constructed and instrumented to monitor the thermally induced behaviors and better understand the interaction between the superstructure and substructure within the limits of this system. Strain gages were attached to the steel girders and lateral end pressures were monitored using earth pressure cells to determine the level of stress thermally induced in the GRS approach over a 3.5 year monitoring period and evaluate the rigidity of the boundary conditions that exist at the interface. During this 3.5 year monitoring period, the data show that the GRS approach is engaged with the superstructure, and experiences both active and passive lateral pressures during each thermal cycle without displaying an increase in passive pressure with time. The stress-strain data acquired during this project indicate that the GRS IBS is behaving significantly more like a system with unrestrained boundaries due to the flexibility of the GRS approach at each end. The tightly spaced reinforcements create a composite material at the ends of the superstructure that enable the approach fill to move successfully with thermally induced superstructure deformations without creating a failure within the soil or at the surface of the roadway (interface included).

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Section: Fig 1 Grs Ibs Constructed In Defiance Ohio (2009): (A) Dementioning

confidence: 99%

Three-Year Evaluation of Thermally Induced Strain and Corresponding Lateral End Pressures for a GRS IBS in Ohio

Warren

Whelan

Hite

et al. 2014

Geo-Congress 2014 Technical Papers

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“…The advantages of a GRS-IBS have been widely documented (2,3). Many GRS-IBSs have been instrumented in the field (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12), some of which showed through field measurements that thermal effects do occur in a GRS-IBS. This is because GRS-IBSs are integral bridges whereby the superstructure is structurally connected to the substructure.…”

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confidence: 99%

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

Taeb¹,

Ooi

2020

Transportation Research Record: Journal of the Transportation R

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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.

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Experimental and theoretical studies on deformation characteristics of Geosynthetic-Reinforced Soil (GRS) abutments induced by vertical loads

Wang,

Xu,

Shen

et al. 2024

Geotextiles and Geomembranes

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Preliminary Results for a GRS Integrated Bridge System Supporting a Large Single Span Bridge

Cited by 5 publications

References 2 publications

Three-Year Evaluation of Thermally Induced Strain and Corresponding Lateral End Pressures for a GRS IBS in Ohio

Three-Year Evaluation of Thermally Induced Strain and Corresponding Lateral End Pressures for a GRS IBS in Ohio

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

Experimental and theoretical studies on deformation characteristics of Geosynthetic-Reinforced Soil (GRS) abutments induced by vertical loads

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