@article{cote_robinson_gabr_borden_2013, title={Performance-Cost Analysis of Stabilized Undercut Subgrades}, volume={139}, ISSN={["0733-9364"]}, DOI={10.1061/(asce)co.1943-7862.0000572}, abstractNote={AbstractAn approach for comparatively evaluating the performance cost of undercut subgrade stabilization measures is presented. The performance-cost analysis coupled results from laboratory cyclic load testing with material prices and estimated cost factors for stabilization alternatives. The study utilized data from 22 simulated undercut sections with different stabilization configurations over a soft subgrade with a California bearing ratio of approximately 2.0%. The computed cost factors are normalized with respect to the rut-depth magnitude and subgrade strength. Sections with lime-stabilized subgrade were the most economical with respect to initial and postrut repair cycles. Unreinforced aggregate based course (ABC) sections between 356 and 508 mm (14 and 20 in.) in thickness were economical during initial cycles. Sections with geosynthetic reinforcement showed that once enough rut depth is induced to mobilize the strength of the reinforcement, economical performance was comparable with other stabili...}, number={2}, journal={JOURNAL OF CONSTRUCTION ENGINEERING AND MANAGEMENT-ASCE}, publisher={American Society of Civil Engineers (ASCE)}, author={Cote, Benjamin and Robinson, Brent and Gabr, M. A. and Borden, Roy H.}, year={2013}, month={Feb}, pages={121–127} }
 @article{robinson_suarez_gabr_kowalsky_2011, title={Simplified Lateral Analysis of Deep Foundation Supported Bridge Bents: Driven Pile Case Studies}, volume={16}, ISSN={["1084-0702"]}, DOI={10.1061/(asce)be.1943-5592.0000182}, abstractNote={A simplified approach for modeling soil and foundation system supported bridge bents is applied to three bridges that represent three pile types and three superstructures. This point-of-fixity approach is applied by modeling the bridge bent substructure as an elastic frame. The models are compared with more refined analyses in FB-MultiPier, with SAP as an independent verification tool, using pile sections with nonlinear soil, pile, and pile cap material properties. The results for simple pile bents show that an equivalent frame model provides similar moment, shear, and displacement values as those obtained from both the SAP and MultiPier nonlinear analyses. Analysis results also indicated that the equivalent frame model parameters are particularly sensitive to the comparable selection of both axial and lateral loads. If lateral loads used to develop the equivalent model are higher than experienced, the axial and lateral deflections and moments will also be higher. For design purposes, this is conservative.}, number={4}, journal={JOURNAL OF BRIDGE ENGINEERING}, author={Robinson, Brent and Suarez, Vinicio and Gabr, Mohammed A. and Kowalsky, Mervyn}, year={2011}, pages={558–569} }
 @article{valiquette_robinson_borden_2010, title={Energy Efficiency and Rod Length Effect in Standard Penetration Test Hammers}, ISSN={["2169-4052"]}, DOI={10.3141/2186-06}, abstractNote={Twenty-eight standard penetration test (SPT) hammers owned by the North Carolina Department of Transportation and private consultants were used to investigate the average energy efficiency and variability of manual versus automatic hammers, as well as the effect of SPT rod length on hammer efficiency. The results agree with published data in several regards. Automatic hammers in the study were found to have an average transferred efficiency of 80.9%. This finding agrees very well with the 80% efficiency assumed in geotechnical engineering practice for automatic hammers. Manual hammers in the study averaged 63.9%, close to the 60% efficiency assumed for manual hammers. Manual hammers were found to be twice as variable as automatic hammers in transferred energy from blow to blow within an SPT blow count. The study demonstrated that the measured transferred energy appeared to be affected by rod length. Lengths shorter than approximately 40 ft caused reduced energy to be transferred into the rod. An empirical formula is presented for correcting short rod length energy losses. The data did not demonstrate a strong dependence on SPT N-value, although the data set lacked observations where the N-value was less than 6 blows per ft.}, number={2186}, journal={TRANSPORTATION RESEARCH RECORD}, author={Valiquette, Michael and Robinson, Brent and Borden, Roy H.}, year={2010}, pages={47–56} }
 @article{suits_sheahan_cote_robinson_pyo_park_gabr_borden_2010, title={Laboratory Performance Comparison of Stabilized Undercut Subgrade Under Cyclic Loading}, volume={33}, DOI={10.1520/gtj102935}, abstractNote={Abstract}, number={6}, journal={Geotechnical Testing Journal}, publisher={ASTM International}, author={Suits, L. D. and Sheahan, T. C. and Cote, Benjamin and Robinson, Brent and Pyo, Sangchul and Park, Young Jin and Gabr, Mohammed and Borden, Roy}, year={2010}, pages={102935} }
 @article{vidot-vega_possiel_robinson_kowalsky_gabr_2009, title={Evaluation of Rotational Stiffness of Elastomeric Bearing Pad-Anchor Bolt Connections on Deep Foundation Bents}, volume={14}, ISSN={["1084-0702"]}, DOI={10.1061/(ASCE)BE.1943-5592.0000010}, abstractNote={Experimental tests are performed on a bearing pad-anchor bolt connection to study rotational stiffness and moment transfer capabilities of a typical bridge configuration. The experimental program is divided in two phases. The first phase consisted of shear and compression properties of two types of bearing pads. The second phase consisted of a total of 42 full-scale tests of a bearing pad-anchor bolt connection. The tested bridge-bent configuration includes two AASHTO Type II girders made continuous with a slab and diaphragm, bearing pads, pile caps, and piles. Variables included axial loads applied to the piles and bearing pads, two different sets of bearing pads, and three different pile types. The bridge connection is subjected to lateral cyclic reversed loading in one-cycle displacement increments. Test results show the potential for this type of connection to sustain lateral loads and flexural moments, and to develop the full strength of the pile elements. Shear and compression modulus are also obtained for the bearing pad types used in this study. Rotational stiffness values for the connection are determined as a function of varying axial loads.}, number={6}, journal={JOURNAL OF BRIDGE ENGINEERING}, publisher={American Society of Civil Engineers (ASCE)}, author={Vidot-Vega, Aidcer L. and Possiel, Ben and Robinson, Brent and Kowalsky, Mervyn J. and Gabr, Mohammed A.}, year={2009}, pages={487–495} }
 @article{ahn_cote_robinson_gabr_borden_2009, title={Inverse Analysis of Plate Load Tests to Assess Subgrade Resilient Modulus}, volume={2101}, ISSN={["2169-4052"]}, DOI={10.3141/2101-13}, abstractNote={ Cyclic plate load testing is commonly used to investigate subgrade response under repetitive loads. Two frameworks for performing inverse analysis are described for backcalculating resilient moduli on the basis of measured key outputs. In the first approach, an elastic modulus is back-calculated in each selected domain; in the second, selected parameters in the resilient modulus model are estimated. The axisymmetric finite element model analysis results suggest that the second approach is more robust because it allows the modulus to be distributed in the selected domain. A series of sensitivity analyses was conducted with the second approach to illustrate how the assumed properties or model geometry affects the backcalculated parameters. Discrepancies between the back-calculated parameters and their known values were observed when the distance to the boundary–-that is, the radial distance from centerline to sidewall–-was not properly assigned. When backcalculating only selected parameters in the resilient modulus equation, it is necessary to assign the other parameters carefully (i.e., from laboratory tests or references). An example analysis shows the application of the proposed approach to an actual plate load test. }, number={2101}, journal={TRANSPORTATION RESEARCH RECORD}, publisher={Transportation Research Board}, author={Ahn, Jaehun and Cote, Benjamin M. and Robinson, Brent and Gabr, Mohammed A. and Borden, Roy H.}, year={2009}, pages={110–117} }