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Post-fire mechanical properties of advanced high-strength cold-formed steel alloys
https://orcid.org/0000-0002-1263-3417
https://orcid.org/0000-0002-1529-0552
https://orcid.org/0000-0002-3511-9226
Abstract An experimental investigation was conducted on the post-fire mechanical properties of advanced high-strength cold-formed steel alloys. Tensile specimens made of two dual-phase steels and two martensitic steels with nominal yield stress from 340 MPa to 1200 MPa were tested after exposure to temperatures up to 700 °C. The stress-strain curves and mechanical properties were obtained from the tests and post-fire retention factors were derived. Comparison with available test data on hot-rolled and conventional cold-formed steels showed the influence of cold-working and steel grade on the post-fire mechanical properties. The permanent reduction in strength after exposure to elevated temperature is more severe and starts at lower temperatures for cold-formed steels compared with hot-rolled steels. Furthermore, cold-formed steels made of advanced high-strength grade exhibit proportionally larger permanent reductions in yield stress and ultimate stress than those made of conventional grade. A model for the post-fire properties of advanced high-strength cold-formed steels was proposed based on calibration of a simple three-coefficient equation developed through committee work with the American Iron and Steel Institute.
Highlights Study on post-fire properties of AHSS alloys with up to 1200 MPa yield stress. Tests of ASTM E8 coupons after exposure to temperatures up to 700 °C. Comparison with literature data of hot-rolled and cold-formed steels residual properties. Obtained AHSS data show greater post-fire loss than published data and design codes. New predictive models are proposed to determine the post-fire mechanical properties of AHSS.
Post-fire mechanical properties of advanced high-strength cold-formed steel alloys
https://orcid.org/0000-0002-1263-3417
https://orcid.org/0000-0002-1529-0552
https://orcid.org/0000-0002-3511-9226
Abstract An experimental investigation was conducted on the post-fire mechanical properties of advanced high-strength cold-formed steel alloys. Tensile specimens made of two dual-phase steels and two martensitic steels with nominal yield stress from 340 MPa to 1200 MPa were tested after exposure to temperatures up to 700 °C. The stress-strain curves and mechanical properties were obtained from the tests and post-fire retention factors were derived. Comparison with available test data on hot-rolled and conventional cold-formed steels showed the influence of cold-working and steel grade on the post-fire mechanical properties. The permanent reduction in strength after exposure to elevated temperature is more severe and starts at lower temperatures for cold-formed steels compared with hot-rolled steels. Furthermore, cold-formed steels made of advanced high-strength grade exhibit proportionally larger permanent reductions in yield stress and ultimate stress than those made of conventional grade. A model for the post-fire properties of advanced high-strength cold-formed steels was proposed based on calibration of a simple three-coefficient equation developed through committee work with the American Iron and Steel Institute.
Highlights Study on post-fire properties of AHSS alloys with up to 1200 MPa yield stress. Tests of ASTM E8 coupons after exposure to temperatures up to 700 °C. Comparison with literature data of hot-rolled and cold-formed steels residual properties. Obtained AHSS data show greater post-fire loss than published data and design codes. New predictive models are proposed to determine the post-fire mechanical properties of AHSS.
Post-fire mechanical properties of advanced high-strength cold-formed steel alloys
https://orcid.org/0000-0002-1263-3417
https://orcid.org/0000-0002-1529-0552
https://orcid.org/0000-0002-3511-9226
Abstract An experimental investigation was conducted on the post-fire mechanical properties of advanced high-strength cold-formed steel alloys. Tensile specimens made of two dual-phase steels and two martensitic steels with nominal yield stress from 340 MPa to 1200 MPa were tested after exposure to temperatures up to 700 °C. The stress-strain curves and mechanical properties were obtained from the tests and post-fire retention factors were derived. Comparison with available test data on hot-rolled and conventional cold-formed steels showed the influence of cold-working and steel grade on the post-fire mechanical properties. The permanent reduction in strength after exposure to elevated temperature is more severe and starts at lower temperatures for cold-formed steels compared with hot-rolled steels. Furthermore, cold-formed steels made of advanced high-strength grade exhibit proportionally larger permanent reductions in yield stress and ultimate stress than those made of conventional grade. A model for the post-fire properties of advanced high-strength cold-formed steels was proposed based on calibration of a simple three-coefficient equation developed through committee work with the American Iron and Steel Institute.
Highlights Study on post-fire properties of AHSS alloys with up to 1200 MPa yield stress. Tests of ASTM E8 coupons after exposure to temperatures up to 700 °C. Comparison with literature data of hot-rolled and cold-formed steels residual properties. Obtained AHSS data show greater post-fire loss than published data and design codes. New predictive models are proposed to determine the post-fire mechanical properties of AHSS.
Post-fire mechanical properties of advanced high-strength cold-formed steel alloys
Yan, Xia (author) / Xia, Yu (author) / Blum, Hannah B. (author) / Gernay, Thomas (author)
Thin-Walled Structures ; 159
2020-11-09
Article (Journal)
Electronic Resource
English
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