Journal ArticleDOI
Material properties of cold-formed high strength steel at elevated temperatures
Hai-Ting Li,Ben Young +1 more
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TLDR
In this paper, a test program has been carried out to investigate the material properties of cold-formed high strength steel at elevated temperatures, including thermal elongation, elastic modulus, yield stress, ultimate strength and fracture strain.Abstract:
This paper presents the material properties of cold-formed high strength steel at elevated temperatures. Material properties at elevated temperatures have a crucial role in fire resistance design of steel structures. The fire resistances of steel structures in the existing international standards are mainly based on experimental data of hot-rolled mild steel. However, investigation of high strength steel at elevated temperatures is limited. Therefore, a test program has been carried out to investigate the material properties of cold-formed high strength steel at elevated temperatures. The coupon specimens were extracted from cold-formed high strength steel square and rectangular hollow sections with nominal yield stresses of 700 and 900 MPa at ambient temperature. The coupon tests were carried out through both steady and transient state test methods for temperatures up to 1000 °C. Material properties including thermal elongation, elastic modulus, yield stress, ultimate strength, ultimate strain and fracture strain were obtained from the tests. The test results were compared with the design values in the European, American, Australian and British standards. The comparison results revealed the necessity of proposing specified design rules for material properties of cold-formed high strength steel at elevated temperatures. New design curves to determine the deterioration of material properties of cold-formed high strength steel at elevated temperatures are proposed. It is shown that the proposed design curves are suitable for high strength steel materials with nominal yield stresses ranged from 690 to 960 MPa at ambient temperature.read more
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Journal ArticleDOI
Description of stress-strain curves for cold-formed steels
Leroy Gardner,Xiang Yun +1 more
TL;DR: In this paper, a two-stage Ramberg-Osgood model is used to model the engineering stress-strain response of cold-formed steels, which can be accurately described by the values of the key input parameters.
Journal ArticleDOI
Mechanical properties and cross-sectional behavior of additively manufactured high strength steel tubular sections
TL;DR: In this article, the authors investigate the mechanical properties and structural performance of additively manufactured high strength steel tubular sections at the cross-sectional level through experimental program, and the results were used to assess the applicability of existing design provisions in the American Specification, Australian and New Zealand Standard as well as European Code.
Journal ArticleDOI
Tests of Cold-formed High Strength Steel Tubular Sections undergoing Web Crippling
Hai-Ting Li,Ben Young +1 more
TL;DR: In this paper, an experimental investigation of cold-formed high strength steel tubular sections undergoing web crippling was conducted on square and rectangular hollow sections with nominal 0.2% proof stresses of 700 and 900 MPa.
Journal ArticleDOI
Residual mechanical properties of high strength steels after exposure to fire
Hai-Ting Li,Ben Young +1 more
TL;DR: In this paper, the residual mechanical properties of high strength steels (HSS) after exposure to fire were investigated. And the influence of heating rate on post-fire mechanical properties was also investigated.
Journal ArticleDOI
Elevated temperature mechanical properties of cold-rolled steel sheets and cold-formed steel sections
M. Rokilan,Mahen Mahendran +1 more
TL;DR: In this paper, low and high strength CFS lipped channel sections and floor decks were tested in the temperature range of 20-700°C under isothermal conditions to determine the reductions in their mechanical properties.
References
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Journal ArticleDOI
Behavior of High Strength Structural Steel at Elevated Temperatures
TL;DR: In this paper, the mechanical properties of high strength structural steel and mild structural steel at elevated temperatures were investigated using steady and transient-state test methods, and it was shown that the reduction factors of yield strength and elastic modulus of both high strength and mild steel are quite similar for the temperature ranging from 22 to 540°C.
Journal ArticleDOI
Mechanical properties of structural steel at elevated temperatures and after cooling down
Jyri Outinen,Pentti Mäkeläinen +1 more
TL;DR: In this article, the experimental test results for the mechanical properties of the studied steel grades S350GD+Z, S355 and S460M at fire temperatures are presented with a short description of the testing facilities.
Reference BookDOI
Steel and Composite Structures : Behaviour and Design for Fire Safety
TL;DR: In this paper, the authors introduce the Behaviour and Design at Ambient Tempeture (BEAT) at the level of Steel and Composite Structures in Fire and Numerical Modelling.
Journal ArticleDOI
High-Temperature Properties of Steel for Fire Resistance Modeling of Structures
TL;DR: In this paper, the effect of various constitutive models on overall fire resistance predictions is illustrated through case studies, and the results from the case studies are used to draw recommendations on the use of appropriate constitutive model for fire resistance assessment.
Journal ArticleDOI
Elevated temperature material properties of stainless steel alloys
TL;DR: In this paper, the authors present an overview and reappraisal of previous pertinent research, together with an evaluation of existing elevated temperature stainless steel stress-strain test data and previously proposed material models.