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Showing 1 to 20 of 71 for “"LRFD"”.
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LRFD evaluation of full-scale metal building rigid frame tests
… linearly elastic frame analyses and 1993 AISC LRFD Specification strength checks. It was concluded that standard analysis procedures are very accurate when applied to rigid frames such as the ones in this study. The provisions concerning lateral-torsional buckling of singly-tapered segments …
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Implications of P-Delta analysis and LRFD of gable frames
Recent developments in the philosophy of structural steel design have led to design specifications that incorporate second-order geometric effects. The use of second-order elastic analysis (SOEA) in the design of structural frameworks may lead to more economically designed structures and increased …
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Experimental and analytical investigation of the LRFD strength of tapered members
… of this study was to investigate the AISC LRFD strength of the rigid knee portion of gable frames. The experimental portion of this study was sponsored by Kawada Industries, Inc., Costa Mesa, California. Eight specimens consisting of a tapered column and a portion of the tapered rafter were …
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Numerical Study and Load and Resistance Factor Design (LRFD) Calibration for Reinforced Soil Retaining Walls
Load and resistance factor design (LRFD) (often called limit states design (LSD)) has been mandated in the AASHTO Bridge Design Specifications and will be adopted in future editions of Canadian Highway Bridge Design Code for all transportation-related structures including reinforced soil retaining …
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Comparison of LRFD and allowable stress design criteria for the design of multi-story frames
… of limit states. The main difference between LRFD and the traditional Allowable Stress Design method is the use of load and resistance factors, which account for the variability of parameters affecting the design. The purpose of this study is to compare both design methods. To do so, a …
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The Influence of the Recommended LRFD Guidelines for the Seismic Design of Highway Bridges on Virginia Bridges
The influence of the recommended LRFD Guidelines for the seismic design of highway bridges in Virginia was investigated by analyzing two existing bridges. The first bridge has prestressed concrete girders and is located in the Richmond area. The second bridge has steel girders and is located in the …
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Load and resistance factor design of drilled shafts subjected to lateral loading at service limit state
… 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 subjected to lateral loads using reliability-based analysis. On a …
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Load and resistance factor design of cold-formed stainless steel structural members
… load and resistance factor design (LRFD) criteria have been successfully applied to the structural design of hot-rolled steel shapes and built-up members. The AISI LRFD Specification is being developed as well for the design of structural members cold-formed from carbon and low alloy …
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Pier moment-rotation behavior of high performance steel HPS70W I-girders
… 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 currently …
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Thermal Gradients in Southwestern United States and the Effect on Bridge Bearing Loads
… 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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Simplified live-load moment distribution factors for simple span slab on I-girder bridges
… 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 techniques used in modeling …
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Nontraditional Limitations on the Shear Capacity of Prestressed Concrete Girders
… included in the 4th edition of the AASHTO LRFD Bridge Design Specifications may underestimate the demand on longitudinal tension reinforcement. Alternatively an equilibrium based approach is presented for determining demand on longitudinal tension reinforcement near the support.
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Load and resistance factor design of drilled shafts in shale using SPT and TCP measurements
… based on Load and Resistance Factor Design (LRFD) methods that relate uniaxial compressive strength measurements of rock cores to the side and tip resistance for drilled shafts. However, shale and other weak rock can be notoriously difficult to effectively sample and test, which poses …
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Interface Shear Strength in Lightweight Concrete Bridge Girders
… of lightweight concrete. The current AASHTO LRFD Specification provides design equations for horizontal shear strength of both lightweight and normal weight concrete. Thirty-six push-off tests were performed to determine if the current code equations accurately predict the horizontal shear …
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Stiffener Design for Beam-to-Column Connections
… design for the test specimens was based on LRFD guidelines. The actual load distribution between the column web and stiffeners is determined from strain data obtained during testing. This distribution is compared with the assumed loads obtained from the initial LRFD calculations. Finite …
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Shear Strength of a PCBT-53 Girder Fabricated with Lightweight, Self-Consolidating Concrete
… 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 upper limit …
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Reliability based criteria for cold-formed steel members
… entitled "Load and Resistance Factor Design (LRFD) of Cold-Formed Steel" was conducted at the University of Missouri-Rolla, Washington University, and the University of Minnesota. This study included the selection of a reliability analysis model; the evaluation of load factors; the calibration …
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Resistance Factor for Cold-Formed Steel Compression Members
This research investigates if the LRFD strength reduction factor for cold-formed steel compression members can be increased above its current value of Ï c = 0.85, which was established by the LRFD Cold-Formed Steel Design Manual (1991) on the basis of 264 column tests. The resistance factor in the …
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Shear Strength of Full-Scale Prestressed Lightweight Concrete Girders with Composite Decks
… shear strength according to the 2010 AASHTO LRFD Bridge Specifications. Compared to normal weight concrete, sand-lightweight concrete performed reasonably well, and therefore, does not need a lightweight modifier when designing for shear. However, a reliability analysis of the …
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