The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Thomas Lee Wilkinson - One of the best experts on this subject based on the ideXlab platform.
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LRFD FOR ENGINEERED WOOD STRUCTURES - CONNECTION BEHAVIORAL EQUATIONS
Journal of Structural Engineering-asce, 1993Co-Authors: Thomas E. Mclain, David G. Pollock, Lawrence A. Soltis, Thomas Lee WilkinsonAbstract:A new design specification for engineered wood structures has been proposed in load and resistance factor design (LRFD) format. This paper provides an overview of the proposed LRFD connections design criteria. The connections design provisions are, in part, calibrated from Allowable Stress design provisions. Major changes from historic practice, however, result from a change in behavioral equations to a theoretical base for predicting the lateral strength of connections using bolts, screws, and nails. New provisions for axial withdrawal of driven and turned fasteners, as well as combined axial and lateral loading criteria are also proposed. Safety levels were calibrated to historic practice, but some change in design capacity is expected due to format change, conversion to new behavioral equations, and the selection of a calibration point. The LRFD document contains substantial improvement in code clarity, simplification, and structure over the historic Allowable Stress design specification. A clear mechanism for including design with new wood-based engineering materials is provided.
Thomas E. Mclain - One of the best experts on this subject based on the ideXlab platform.
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LRFD FOR ENGINEERED WOOD STRUCTURES - CONNECTION BEHAVIORAL EQUATIONS
Journal of Structural Engineering-asce, 1993Co-Authors: Thomas E. Mclain, David G. Pollock, Lawrence A. Soltis, Thomas Lee WilkinsonAbstract:A new design specification for engineered wood structures has been proposed in load and resistance factor design (LRFD) format. This paper provides an overview of the proposed LRFD connections design criteria. The connections design provisions are, in part, calibrated from Allowable Stress design provisions. Major changes from historic practice, however, result from a change in behavioral equations to a theoretical base for predicting the lateral strength of connections using bolts, screws, and nails. New provisions for axial withdrawal of driven and turned fasteners, as well as combined axial and lateral loading criteria are also proposed. Safety levels were calibrated to historic practice, but some change in design capacity is expected due to format change, conversion to new behavioral equations, and the selection of a calibration point. The LRFD document contains substantial improvement in code clarity, simplification, and structure over the historic Allowable Stress design specification. A clear mechanism for including design with new wood-based engineering materials is provided.
David G. Pollock - One of the best experts on this subject based on the ideXlab platform.
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LRFD FOR ENGINEERED WOOD STRUCTURES - CONNECTION BEHAVIORAL EQUATIONS
Journal of Structural Engineering-asce, 1993Co-Authors: Thomas E. Mclain, David G. Pollock, Lawrence A. Soltis, Thomas Lee WilkinsonAbstract:A new design specification for engineered wood structures has been proposed in load and resistance factor design (LRFD) format. This paper provides an overview of the proposed LRFD connections design criteria. The connections design provisions are, in part, calibrated from Allowable Stress design provisions. Major changes from historic practice, however, result from a change in behavioral equations to a theoretical base for predicting the lateral strength of connections using bolts, screws, and nails. New provisions for axial withdrawal of driven and turned fasteners, as well as combined axial and lateral loading criteria are also proposed. Safety levels were calibrated to historic practice, but some change in design capacity is expected due to format change, conversion to new behavioral equations, and the selection of a calibration point. The LRFD document contains substantial improvement in code clarity, simplification, and structure over the historic Allowable Stress design specification. A clear mechanism for including design with new wood-based engineering materials is provided.
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Design of Connections in Wood Structures: LRFD vs. ASD
Structural Engineering in Natural Hazards Mitigation, 1993Co-Authors: David G. PollockAbstract:This paper provides a comparison of connection design capacities using load and resistance factor design (LRFD) procedures and Allowable Stress design (ASD) procedures.
Lawrence A. Soltis - One of the best experts on this subject based on the ideXlab platform.
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LRFD FOR ENGINEERED WOOD STRUCTURES - CONNECTION BEHAVIORAL EQUATIONS
Journal of Structural Engineering-asce, 1993Co-Authors: Thomas E. Mclain, David G. Pollock, Lawrence A. Soltis, Thomas Lee WilkinsonAbstract:A new design specification for engineered wood structures has been proposed in load and resistance factor design (LRFD) format. This paper provides an overview of the proposed LRFD connections design criteria. The connections design provisions are, in part, calibrated from Allowable Stress design provisions. Major changes from historic practice, however, result from a change in behavioral equations to a theoretical base for predicting the lateral strength of connections using bolts, screws, and nails. New provisions for axial withdrawal of driven and turned fasteners, as well as combined axial and lateral loading criteria are also proposed. Safety levels were calibrated to historic practice, but some change in design capacity is expected due to format change, conversion to new behavioral equations, and the selection of a calibration point. The LRFD document contains substantial improvement in code clarity, simplification, and structure over the historic Allowable Stress design specification. A clear mechanism for including design with new wood-based engineering materials is provided.
Kazuhiro Kimura - One of the best experts on this subject based on the ideXlab platform.
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Evaluation and Extension of Allowable Stress Values for GR.91
Volume 6B: Materials and Fabrication, 2017Co-Authors: Kazuhiro KimuraAbstract:Evaluation and extension of Allowable Stress values of Grade 91 steel have been investigated with the updated creep database. Creep database has been updated and 2,046 of time to rupture data, 523 of time to initiation of tertiary creep data and 388 of time to 1% total strain data have been compiled. Accuracy of evaluation and extrapolation was examined on several type data analysis procedures. Larson-Miller and Orr-Sherby-Dorn parameters were used. Lot-centering method, data-censoring by 1,000 h, and region-splitting method by half-yield were investigated. Precise and conservative evaluation was obtained by region-splitting analysis with 3rd and 2nd order polynomials for high- and low-Stress regimes, respectively. According to the data analysis, Minimum Stress-to-Rupture, Sr, and Allowable Stress Intensity Values of St and Smt have been evaluated and extended to 500,000 hours.Copyright © 2017 by ASME
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Review of Allowable Stress and new guideline of long-term creep strength assessment for high Cr ferritic creep resistant steels
Materials at High Temperatures, 2008Co-Authors: Kazuhiro KimuraAbstract:AbstractA large drop in creep rupture strength in the long-term is a noticeable phenomenon for high Cr ferritic creep resistant steels, since it may result in overestimation of 100,000 h creep rupture strength, and Allowable Stress. A program for assessment of long-term creep strength and review of current Allowable Stress of high Cr ferritic creep resistant steels has been conducted in Japan. Provisional rules for revised Allowable Stress and new life prediction method for those materials have been set up at the beginning of 2005. In this paper, the contents of those rules will be presented.
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assessment of long term creep strength and review of Allowable Stress of high cr ferritic creep resistant steels
ASME 2005 Pressure Vessels and Piping Conference, 2005Co-Authors: Kazuhiro KimuraAbstract:Large drop in creep rupture strength in the long-term is a noticeable phenomenon for high Cr ferritic creep resistant steels, and the neglecting this phenomenon may result in overestimation of 100,000h creep rupture strength, and Allowable Stress. A committee at Japan Power Engineering and Inspection Corporation was organized to evaluate long-term creep strength and to review current Allowable Stresses of high Cr ferritic creep resistant steels. Life prediction method for high Cr ferritic creep resistant steels with tempered martensite microstructure is discussed. Appropriateness of current Allowable tensile Stress regulated in METI (Ministry of Economy, Trade and Industry) Thermal Power Standard Code has been assessed on a modified 9Cr-1Mo steel (ASME Gr.91) and KA-SUS410J3 type steels. KA-SUS410J3 is a material specification in METI Thermal Power Standard Code and corresponds to ASME Gr.122. The validity of existing Allowable Stress was shown on a modified 9Cr-1Mo steel. Those for KA-SUS410J3 type steels, however, have been revised to the lower values.Copyright © 2005 by ASME
