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    Ultimate Stress Design

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    Jennifer dela Cruz
    The Ultimate Strength Design (USD) method is used extensively for structural design as it more accurately predicts the ultimate strength of reinforced concrete sections. USD is based on the actual inelastic behavior of materials from extensive experimental research, unlike the Working Stress Design method which assumes elastic behavior. USD assumes that the stress in reinforcement remains constant after yielding while concrete sections reach capacity at 0.003 strain in compression. Strains across sections are considered to vary linearly between known values.

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    Ultimate Stress Design

    Uploaded by

    Jennifer dela Cruz
    34 views4 pages
    The Ultimate Strength Design (USD) method is used extensively for structural design as it more accurately predicts the ultimate strength of reinforced concrete sections. USD is based on the actual inelastic behavior of materials from extensive experimental research, unlike the Working Stress Design method which assumes elastic behavior. USD assumes that the stress in reinforcement remains constant after yielding while concrete sections reach capacity at 0.003 strain in compression. Strains across sections are considered to vary linearly between known values.

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    Ultimate-Stress-Design

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    The Ultimate Strength Design (USD) method is used extensively for structural design as it more accurately predicts the ultimate strength of reinforced concrete sections. USD is based on the actual inelastic behavior of materials from extensive experimental research, unlike the Working Stress Design method which assumes elastic behavior. USD assumes that the stress in reinforcement remains constant after yielding while concrete sections reach capacity at 0.003 strain in compression. Strains across sections are considered to vary linearly between known values.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    34 views4 pages

    Ultimate Stress Design

    Uploaded by

    Jennifer dela Cruz
    The Ultimate Strength Design (USD) method is used extensively for structural design as it more accurately predicts the ultimate strength of reinforced concrete sections. USD is based on the actual inelastic behavior of materials from extensive experimental research, unlike the Working Stress Design method which assumes elastic behavior. USD assumes that the stress in reinforcement remains constant after yielding while concrete sections reach capacity at 0.003 strain in compression. Strains across sections are considered to vary linearly between known values.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 4

    Group Concrete

    Castillo Nikki
    Damian Kenji B.
    Dela Cruz Jhen 
    De Jesus Mark
    Esguerra Gelo
    Ultimate Stress
    Design Method
    Ultimate Strength Design method is used extensively and almost
    exclusively in many countries for structural design practice. The
    Working Stress Design (WSD) method designs RC sections assuming
    them to be within their elastic limits, where stresses are proportional to
    strains. Large margins or factors of safety are assumed on material
    strengths to ensure such behavior. It is equally, if not more important to
    predict the ultimate strength of RC sections so that they can be
    designed to resist the largest loads anticipated during their design lives.
    The materials are not expected to remain within their elastic limits at
    such high stresses. More realistic methods of analysis, based on actual
    inelastic behavior rather than assumed elastic behavior of materials and
    on results of extremely extensive experimental research, have been
    performed to predict the ultimate strengths. The Ultimate Strength
    Design (USD) method, derived from such works.
    Stress in reinforcement varies linearly with strain up to the specified yield
    strength. The stress remains constant beyond this point as strains continue
    increasing. This implies that the strain hardening of steel is ignored.
    Concrete sections are considered to have reached their flexural capacities when
    they develop 0.003 strain in the extreme compression fiber.
    Strains in reinforcement and concrete are directly proportional to the distance
    from neutral axis. This implies that the variation of strains across the section is
    Assumptions of linear, and unknown values can be computed from the known values of strain
    through a linear relationship.
    Ultimate Tensile strength of concrete is neglected.

    ress Design Method: Compressive stress distribution of concrete can be represented by the
    corresponding stress-strain relationship of concrete.

    Limitations of Ultimate Strength Design Method:


    Collapse of FLEXURE, COMPRESSION, SHEAR, TORSION

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