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Showing 1 to 20 of 186 for “"AASHTO"”.
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Analysis of the AASHTO LFRD Horizontal Shear Strength Equation
… horizontal shear strength calculated from the AASHTO LFRD bridge design code was compared to the measured shear strength. The professional bias was computed for each specimen. The professional biases, standard deviations, and coefficients of variation for each category were calculated. The …
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Yield line analysis of an AASHTO New Jersey concrete parapet wall
Concrete bridge rails are rated according to three performance levels. For classification at a given performance level, the rail must meet specific strength and geometric requirements. To meet the strength requirement, the rail must be able to satisfactorily withstand a transverse concentrated load …
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Blast Analysis of a Bridge with AASHTO Type VI Girders Using CSI Bridge
… in this thesis represents the response of AASHTO type VI girders of a bridge subjected to blast loading. This research focusses on the material properties by varying the strength concrete i.e. 6 ksi (41.4 MPa) and 15 ksi (103.42 MPa) and structural point of view by varying the point of …
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Residual flexural strength of corroded AASHTO TYPE II pretensioned concrete girder-deck system
… of residual flexural strength of corroded AASHTO Type II pretensioned PC girders with a cast-in-place (CIP) concrete deck. The investigation involved development of a detailed Finite Element Analysis (FEA) model of the pretensioned girder-deck system subjected to corrosion. The FEA model …
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Reliability Analysis of the HEC-18 Scour Equation and AASHTO Deep Foundation Design Codes
… of the foundation followed the procedures of the AASHTO LRFD Bridge Design Specification. The design methods were the HEC-18 pier scour equation used to determine the scour depth, and the α-Method and Nordlund-Thurman Method used to design the driven pile. The limit state considered was the axial …
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Evaluation of the AASHTO Mechanistic Empirical Pavement Design Guide: an experimental and analytical investigation of the performance of flexible roads
The M-EPDG represents a significant attempt to change the approach to engineering design of road structures. It reflects a shift from total reliance on empirical methods to a combination of mechanistic and empirical methods. Three instrumented road sections were used to capture the impact of local …
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Sensitivity Analysis Of Aashto's 2002 Flexible And Rigid Pavement Design Methods
… of State Highway Transportation Officials (AASHTO) road tests. The various editions of the AASHTO pavement design guide have served well for several decades; nevertheless many serious limitations existed for their continued use as the nation's primary pavement design procedure. For example, …
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Load and resistance factor design of drilled shafts subjected to lateral loading at service limit state
… of State Highway Administration Officials (AASHTO) has made utilization of Load and Resistance Factor Design (LRFD) mandatory on all federally-funded new bridge projects (AASHTO, 2007). However, currently, there are no guidelines implementing LRFD techniques for design of drilled shaft …
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Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders
… Transfer Length measurements conducted on two AASHTO Type IV HSLWC prestressed girders, resulted in an average transfer length of 17 inches, well below the AASHTO and ACI guidance. Two girders composed of HSLWC AASHTO Type II girders and a 48" x 8" normal weight 4000-psi concrete deck were …
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Simplified live-load moment distribution factors for simple span slab on I-girder bridges
… bridges to assess the accuracy of both the AASHTO Standard and AASHTO LRFD specifications and to propose an empirical model that correlates better with the analytical results within the range of parameters that are to be studied.;These studies include: (1) a verification study into the FEA …
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Pier moment-rotation behavior of high performance steel HPS70W I-girders
… bridge girders in the current edition of the AASHTO LRFD bridge code (AASHTO, 1998 and interim 2001). The first restriction is that inelastic design involving the moment-rotation relationship of steel girders with a yield strength exceeding 50 ksi is prohibited. Though, bridge designers are …
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Live load distribution factors for multi-span girder bridges with plank decking subjected to farm vehicles
… of State Highway and Transportation Officials (AASHTO) specifications provide simplified formulae to determine Live Load Distribution Factors (LLDFs) for highway bridges. The formulae for the AASHTO code-specified LLDFs have been developed, considering the effect of typical highway trucks. In …
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Determination of AASHTO Bridge Design Parameters through Field Evaluation of the Rt. 601 Bridge: A Bridge Utilizing Strongwell 36 in. Fiber-Reinforced Polymer Double Web Beams as the Main Load Carrying Members
… of this research was to determine the following AASHTO bridge design parameters: wheel load distribution factor g, dynamic load allowance IM, and maximum deflection. The wheel load distribution factor was determined to be S/5, a dynamic load allowance was determined to be 0.30, and the maximum …
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Thermal Gradients in Southwestern United States and the Effect on Bridge Bearing Loads
… larger thermal gradients than recommended by AASHTO LRFD Bridge Design Specifications. The main objective of this study was to evaluate the effect of thermal gradients in the southwestern region of the United States on bearing design. This study consisted of two parts, heat flow analysis using …
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Evaluation of methods for measuring aggregate specific gravity
… of State Highway and Transportation Officials (AASHTO) procedures for determining the aggregate specific gravities and absorption values are time consuming and hence are not appropriate for quality control processes. These methods are not repeatable too which is another issue with the standard …
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DETERMINATION OF DYNAMIC MODULI AND PERMANENT DEFORMATION OF MARYLAND ASPHALT MIXTURES USING AMPT
… on all 28 asphalt mixtures following the AASHTO PP 60, AASHTO PP 61 and AASHTO TP 79 protocols. In addition to the 28 asphalt mixtures from Maryland, DM and RLPD data for 18 asphalt mixtures tested in NCHRP Project 9-30A were also included in parts of this study. In addition to developing …
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On the Fatigue of Headed Shear Studs in Steel-Concrete Composite Bridge Girders
… is the headed shear stud. In the current AASHTO LRFD Bridge Specifications on composite design, shear stud fatigue often governs over static strength, and a large number of shear connectors often result. This dissertation investigates headed shear stud fatigue capacities and demands, and …
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Design of a cable-stayed precast post-tensioned box girder bridge
… cable-stayed bridges are not presented in the AASHTO Code, analysis was based on allowable stresses where requirements in the AASHTO code were not specified.
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Shear Strength of a PCBT-53 Girder Fabricated with Lightweight, Self-Consolidating Concrete
… nominal shear strength calculated using the AASHTO LRFD Specifications was typically unconservative. Test results from this project suggested that the constant multiplier of 0.25 used in the LRFD equation for Vnmax may be too high. Further research may be needed to accurately quantify an …
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