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    Implementation of Cold-Formed Steel Stress–Strain Relationships Using Limited Available Material Parameters

    Source: Journal of Structural Engineering:;2024:;Volume ( 150 ):;issue: 010::page 04024142-1
    Author:
    Junbo Chen
    ,
    Zhiliang Chen
    ,
    Haixin Liu
    ,
    Tak-Ming Chan
    DOI: 10.1061/JSENDH.STENG-13749
    Publisher: American Society of Civil Engineers
    Abstract: Implementation of existing stress–strain models for cold-formed steel requires the input of key material parameters determined from corner coupon tests on cold-formed portions. This paper proposes various approaches that can accurately describe the stress–strain responses of cold-formed steel by using corner material properties if known, or by using parent material properties and the corner geometry after cold-forming in the absence of corner material properties. First, a comprehensive database of coupon test results of cold-formed steel is assembled. A total of 483 corner coupon test results with 236 full stress–strain curves are collected from 31 sources, covering a large range of steel grades with nominal yield strength varying from 235 to 960  MPa. The applicability of existing empirical models for determination of the enhanced yield strength, ultimate strength, and ultimate strain is carefully evaluated. New predictive expressions for the required input parameters (namely, 0.01% or 0.05% proof stresses for the use of the two-stage Ramberg-Osgood model, and the strain hardening exponent for the use of one-stage material model) are subsequently derived. Prediction performances of the two-stage Ramberg-Osgood model and the one-stage material model are then evaluated against experimental stress–strain curves under different availabilities of primary material parameters. According to the proposed approaches, the minimum required input parameter to utilize these models is only the yield strength of cold-formed steel or, alternatively, the yield strength of the parent metal and corner geometry after cold-forming. The developed models are proved to be accurate in predicting the monotonic stress–strain response (up to the ultimate point) of cold-formed steel, and they are suitable for use in parametric studies and advanced modeling of cold-formed structures.
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      Implementation of Cold-Formed Steel Stress–Strain Relationships Using Limited Available Material Parameters

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    contributor authorJunbo Chen
    contributor authorZhiliang Chen
    contributor authorHaixin Liu
    contributor authorTak-Ming Chan
    date accessioned2024-12-24T10:04:51Z
    date available2024-12-24T10:04:51Z
    date copyright10/1/2024 12:00:00 AM
    date issued2024
    identifier otherJSENDH.STENG-13749.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4298260
    description abstractImplementation of existing stress–strain models for cold-formed steel requires the input of key material parameters determined from corner coupon tests on cold-formed portions. This paper proposes various approaches that can accurately describe the stress–strain responses of cold-formed steel by using corner material properties if known, or by using parent material properties and the corner geometry after cold-forming in the absence of corner material properties. First, a comprehensive database of coupon test results of cold-formed steel is assembled. A total of 483 corner coupon test results with 236 full stress–strain curves are collected from 31 sources, covering a large range of steel grades with nominal yield strength varying from 235 to 960  MPa. The applicability of existing empirical models for determination of the enhanced yield strength, ultimate strength, and ultimate strain is carefully evaluated. New predictive expressions for the required input parameters (namely, 0.01% or 0.05% proof stresses for the use of the two-stage Ramberg-Osgood model, and the strain hardening exponent for the use of one-stage material model) are subsequently derived. Prediction performances of the two-stage Ramberg-Osgood model and the one-stage material model are then evaluated against experimental stress–strain curves under different availabilities of primary material parameters. According to the proposed approaches, the minimum required input parameter to utilize these models is only the yield strength of cold-formed steel or, alternatively, the yield strength of the parent metal and corner geometry after cold-forming. The developed models are proved to be accurate in predicting the monotonic stress–strain response (up to the ultimate point) of cold-formed steel, and they are suitable for use in parametric studies and advanced modeling of cold-formed structures.
    publisherAmerican Society of Civil Engineers
    titleImplementation of Cold-Formed Steel Stress–Strain Relationships Using Limited Available Material Parameters
    typeJournal Article
    journal volume150
    journal issue10
    journal titleJournal of Structural Engineering
    identifier doi10.1061/JSENDH.STENG-13749
    journal fristpage04024142-1
    journal lastpage04024142-16
    page16
    treeJournal of Structural Engineering:;2024:;Volume ( 150 ):;issue: 010
    contenttypeFulltext
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