Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes

Fatemeh Azhari, Amin Heidarpour Esfarjani, Xiao Lin Zhao, Christopher Hutchinson

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

This paper presents an experimental study on the post-fire mechanical behavior of ultra-high strength steel (UHSS) tubes with nominal yield strength of 1200MPa. In order to understand the changes occurring during cooling phase of a fire, the in-fire mechanical behavior of UHSS is also studied experimentally. The temperatures characteristic of fire simulated in this study are within the range of 300ºC to 800ºC. In the experimental tests, standard dog-bone UHSS
specimens are subjected to quasi- static tensile tests at fire temperatures and after being cooled to room temperature. The stress-strain curves, strength and ductility of the tested specimens are discussed. To investigate the effect of steel grade on the post-fire mechanical response, the strength deterioration of different grades of steels available in literature including grades of 460, 690, 800 and 960, are compared with those of UHSS (Grade 1200). Finally, the obtained results are explained based on the phase changes occurring in the steel material during fire by calculating the thermodynamic stability of the ferrite and cementite phases in the tested materials.
Original languageEnglish
Title of host publicationStructures in Fire, Proceedings of the Ninth International Conference [(SiF 2016)
Subtitle of host publication June 8 to June 10, Princeton University, USA
EditorsMaria E. Moreyra Garlock, Venkatesh K.R. Kodur
Place of PublicationLancaster, Pennsylvania, USA
PublisherDEStech Publications, Inc
Pages377-384
Number of pages8
ISBN (Print)9781605953205
Publication statusPublished - 2016
EventInternational Conference on Structures in Fire 2016 - Princeton University, Princeton, United States of America
Duration: 8 Jun 201610 Jun 2016
Conference number: 9th
http://www.structuresinfire.com/corpo/conferences/sif16.pdf

Conference

ConferenceInternational Conference on Structures in Fire 2016
Abbreviated titleSIF 2016
CountryUnited States of America
CityPrinceton
Period8/06/1610/06/16
Internet address

Cite this

Azhari, F., Heidarpour Esfarjani, A., Zhao, X. L., & Hutchinson, C. (2016). Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes. In M. E. M. Garlock, & V. K. R. Kodur (Eds.), Structures in Fire, Proceedings of the Ninth International Conference [(SiF 2016): June 8 to June 10, Princeton University, USA (pp. 377-384). Lancaster, Pennsylvania, USA: DEStech Publications, Inc.
Azhari, Fatemeh ; Heidarpour Esfarjani, Amin ; Zhao, Xiao Lin ; Hutchinson, Christopher. / Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes. Structures in Fire, Proceedings of the Ninth International Conference [(SiF 2016): June 8 to June 10, Princeton University, USA. editor / Maria E. Moreyra Garlock ; Venkatesh K.R. Kodur. Lancaster, Pennsylvania, USA : DEStech Publications, Inc, 2016. pp. 377-384
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title = "Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes",
abstract = "This paper presents an experimental study on the post-fire mechanical behavior of ultra-high strength steel (UHSS) tubes with nominal yield strength of 1200MPa. In order to understand the changes occurring during cooling phase of a fire, the in-fire mechanical behavior of UHSS is also studied experimentally. The temperatures characteristic of fire simulated in this study are within the range of 300ºC to 800ºC. In the experimental tests, standard dog-bone UHSS specimens are subjected to quasi- static tensile tests at fire temperatures and after being cooled to room temperature. The stress-strain curves, strength and ductility of the tested specimens are discussed. To investigate the effect of steel grade on the post-fire mechanical response, the strength deterioration of different grades of steels available in literature including grades of 460, 690, 800 and 960, are compared with those of UHSS (Grade 1200). Finally, the obtained results are explained based on the phase changes occurring in the steel material during fire by calculating the thermodynamic stability of the ferrite and cementite phases in the tested materials.",
author = "Fatemeh Azhari and {Heidarpour Esfarjani}, Amin and Zhao, {Xiao Lin} and Christopher Hutchinson",
year = "2016",
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pages = "377--384",
editor = "Garlock, {Maria E. Moreyra} and Kodur, {Venkatesh K.R.}",
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Azhari, F, Heidarpour Esfarjani, A, Zhao, XL & Hutchinson, C 2016, Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes. in MEM Garlock & VKR Kodur (eds), Structures in Fire, Proceedings of the Ninth International Conference [(SiF 2016): June 8 to June 10, Princeton University, USA. DEStech Publications, Inc, Lancaster, Pennsylvania, USA, pp. 377-384, International Conference on Structures in Fire 2016, Princeton, United States of America, 8/06/16.

Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes. / Azhari, Fatemeh; Heidarpour Esfarjani, Amin; Zhao, Xiao Lin; Hutchinson, Christopher.

Structures in Fire, Proceedings of the Ninth International Conference [(SiF 2016): June 8 to June 10, Princeton University, USA. ed. / Maria E. Moreyra Garlock; Venkatesh K.R. Kodur. Lancaster, Pennsylvania, USA : DEStech Publications, Inc, 2016. p. 377-384.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

TY - GEN

T1 - Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes

AU - Azhari, Fatemeh

AU - Heidarpour Esfarjani, Amin

AU - Zhao, Xiao Lin

AU - Hutchinson, Christopher

PY - 2016

Y1 - 2016

N2 - This paper presents an experimental study on the post-fire mechanical behavior of ultra-high strength steel (UHSS) tubes with nominal yield strength of 1200MPa. In order to understand the changes occurring during cooling phase of a fire, the in-fire mechanical behavior of UHSS is also studied experimentally. The temperatures characteristic of fire simulated in this study are within the range of 300ºC to 800ºC. In the experimental tests, standard dog-bone UHSS specimens are subjected to quasi- static tensile tests at fire temperatures and after being cooled to room temperature. The stress-strain curves, strength and ductility of the tested specimens are discussed. To investigate the effect of steel grade on the post-fire mechanical response, the strength deterioration of different grades of steels available in literature including grades of 460, 690, 800 and 960, are compared with those of UHSS (Grade 1200). Finally, the obtained results are explained based on the phase changes occurring in the steel material during fire by calculating the thermodynamic stability of the ferrite and cementite phases in the tested materials.

AB - This paper presents an experimental study on the post-fire mechanical behavior of ultra-high strength steel (UHSS) tubes with nominal yield strength of 1200MPa. In order to understand the changes occurring during cooling phase of a fire, the in-fire mechanical behavior of UHSS is also studied experimentally. The temperatures characteristic of fire simulated in this study are within the range of 300ºC to 800ºC. In the experimental tests, standard dog-bone UHSS specimens are subjected to quasi- static tensile tests at fire temperatures and after being cooled to room temperature. The stress-strain curves, strength and ductility of the tested specimens are discussed. To investigate the effect of steel grade on the post-fire mechanical response, the strength deterioration of different grades of steels available in literature including grades of 460, 690, 800 and 960, are compared with those of UHSS (Grade 1200). Finally, the obtained results are explained based on the phase changes occurring in the steel material during fire by calculating the thermodynamic stability of the ferrite and cementite phases in the tested materials.

M3 - Conference Paper

SN - 9781605953205

SP - 377

EP - 384

BT - Structures in Fire, Proceedings of the Ninth International Conference [(SiF 2016)

A2 - Garlock, Maria E. Moreyra

A2 - Kodur, Venkatesh K.R.

PB - DEStech Publications, Inc

CY - Lancaster, Pennsylvania, USA

ER -

Azhari F, Heidarpour Esfarjani A, Zhao XL, Hutchinson C. Evaluating post-fire mechanical behavior of ultra-high strength (grade1200) steel tubes. In Garlock MEM, Kodur VKR, editors, Structures in Fire, Proceedings of the Ninth International Conference [(SiF 2016): June 8 to June 10, Princeton University, USA. Lancaster, Pennsylvania, USA: DEStech Publications, Inc. 2016. p. 377-384