Post-fire residual material properties of cold-formed steel elliptical hollow sections

2021 ◽  
Vol 183 ◽  
pp. 106723
Author(s):  
Man-Tai Chen ◽  
Madhup Pandey ◽  
Ben Young
Keyword(s):  
Material Properties ◽  
Residual Material ◽  
Cold Formed Steel

scholarly journals Mechanical Properties of Steels for Cold-Formed Steel Structures at Elevated Temperatures

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Zhen Nie ◽  
Yuanqi Li ◽  
Yehua Wang
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Elevated Temperatures ◽  
Elasticity Modulus ◽  
Mechanical Performance ◽  
Strain Curve ◽  
Steel Structures ◽  
Test Method ◽  
Stress Relieving ◽  
Cold Formed Steel

It is highly important to clarify the high-temperature mechanical properties in the design of cold-formed steel (CFS) structures under fire conditions due to the unique deterioration feature in material properties under fire environment and associated reduction to the mechanical performance of members. This paper presents the mechanical properties of widely used steels for cold-formed steel structures at elevated temperatures. The coupons were extracted from original coils of proposed full annealed steels (S350 and S420, with nominal yielding strengths 280 MPa and 350 MPa) and proposed stress relieving annealed steels (G500, with nominal yielding strength 500 MPa) for CFS structures with thickness of 1.0 mm and 1.2 mm, and a total of nearly 50 tensile tests were carried out by steady-state test method for temperatures ranging from 20 to 700°C. Based on the tests, material properties including the yield strengths, ultimate strengths, the elasticity modulus, and the stress-strain curve were obtained. Meanwhile, the ductility of steels for CFS structures was discussed. Then, the temperature-dependent retention factors of yield strengths and elasticity modulus were compared to those provided by design codes and former researchers. Finally, a set of prediction equations of the mechanical properties for steels for CFS structures at elevated temperatures was proposed depending on existing tests data.

Assessment of Mechanical Properties of Cold Formed Steel Material at Elevated Temperature

2016 ◽  
Vol 846 ◽  
pp. 27-36
Author(s):  
Fadhluhartini Muftah ◽  
Mohd Syahrul Hisyam Mohd Sani ◽  
Ahmad Rasidi Osman ◽  
Mohd Azran Razlan ◽  
Shahrin Mohammad
Keyword(s):  
Elastic Modulus ◽  
Elevated Temperature ◽  
Ambient Temperature ◽  
Yield Stress ◽  
Material Properties ◽  
High Efficiency ◽  
Strain Curve ◽  
Ultimate Stress ◽  
Fire Incident ◽  
Cold Formed Steel

Fire accident is considered as the one of most severe environmental hazards to building and infrastructure. Cold formed steel (CFS) beam has been used extensively as primary load bearing structural member in many applications in the building construction due to high efficiency in term of production, fabrication, and assembling in construction. This material must be well perform in fire incident in term of its integrity and stability of structural for a period of time. Hence, the assessment of the material properties of this material is greatly important in order to predict the performance of this structure under fire incident. The tensile coupon tests of CFS are according to BS EN 10002-1:2001. The CFS material G450 with 1.9 mm thickness is used in this study. The elastic modulus, yield stress, correspondent percentage strain at yield stress, ultimate stress, and correspondent percentage strain of ultimate stress was 200.3 GPa, 540.5 MPa, 0.478 %, 618.8 MPa, and 8.701 % respectively. The results of the ambient temperature test have been used to assess the mechanical strength of CFS at elevated temperature. The discussion of material properties is based on EC3-1-2 and proposed model from other researchers. The main material properties discussed is the stress-strain curve, elastic modulus, yield strength at elevated temperature was determined. The actual elastic region is slightly lower than the prediction of EC3-1.2 at ambient temperature, but well fit with two other studies. Besides that, the actual material properties experience strain hardening after yielding and reach a maximum stress up to 618 MPa while EC3-1.2 predict the constant value of the yield stress after yield until 15 % strain,other two study was fit the ambient tensile test up to ultimate stress, and fit until 2 % strain level.

Establishing an industrial symbiosis – key factors and time aspects in steel industry

2019 ◽  
Vol 107 (5) ◽  
pp. 508 ◽  
Author(s):  
Sara Rosendahl ◽  
Katarina Lundkvist ◽  
Björn Haase ◽  
Jeanette Stemne ◽  
Linn Andersson ◽  
...  
Keyword(s):  
Material Properties ◽  
Steel Industry ◽  
Industrial Symbiosis ◽  
Key Factors ◽  
Production Processes ◽  
Residual Material ◽  
Laws And Policies ◽  
Production Industry ◽  
Material Requirements

Today production industry has increasing incentives to be resource efficient and sustainable. Many residual material streams from production processes are therefore recycled internally; however, some streams might be of better use in another industry. In this study, factors seen as encouraging and/or barriers in the work towards an industrial symbiosis with residual materials, between two or more industries, were identified. The factors were divided into five categories: physical/technical, regulatory, business, motivation and society, on three organisational levels. Based on the key factors, the time aspect for establishing an industrial symbiosis was studied and criteria that need to be met in order to carry on with a business idea for a residual material were divided into three work phases. The study shows that an industrial symbiosis based on residual materials on many levels differs from a business with main products, for example when it comes to laws and policies. With residual materials it is also extra important to have good understanding of the material properties and the customer’s material requirements. It was concluded that the establishment of industrial symbioses would be facilitated if all materials had the same conditions regardless of origin provided that the final product gets the same properties.

Effect of temperature and galvanization on the compressive strength of cold-formed angles

1990 ◽  
Vol 17 (3) ◽  
pp. 440-451 ◽  
Author(s):  
D. Polyzois ◽  
P. Charnvarnichborikarn ◽  
S. Rizkalla ◽  
C. K. Wong
Keyword(s):  
Compressive Strength ◽  
Material Properties ◽  
Room Temperature ◽  
Slenderness Ratio ◽  
Effect Of Temperature ◽  
Experimental Program ◽  
Ultimate Capacity ◽  
Cold Formed Steel ◽  
University Of Manitoba ◽  
The University

An experimental program was conducted at The University of Manitoba to investigate the effect of subfreezing temperatures and galvanization on the compressive strength of cold-formed steel angles. The study involved the testing of 20 cold-formed angles, 55 × 55 × 4 mm, with a slenderness ratio of approximately 70. Equal numbers of galvanized and ungalvanized angles were tested at various temperatures ranging from −45 to 25 °C. The material properties were obtained through 48 standard tension coupon tests conducted at the same temperature range. The results showed that the capacity of the angles measured at temperatures below −40 °C was approximately 8% higher than the capacity at room temperature. Similar results were obtained during testing of the standard tension coupons where the yield and tensile strengths of the steel used were approximately 10% higher at temperatures below −40 °C than at room temperature. On the average, the ultimate capacity of galvanized angles was approximately 9% higher than that of ungalvanized angles. Although the yield strength of the corner coupons was between 13% and 27% higher than that of flat coupons tested at room temperature, the compressive strength of the full-size angles was influenced mainly by the material properties of the flat regions. A comparison of the measured and predicted capacities using the current Canadian standard and American specification indicated that the Canadian standard overestimated the ultimate capacity of the angles by as much as 37%, while the American specification underestimated the capacity by as much as 45%. Key words: angles, cold-formed, galvanized, temperature, compression, ultimate.

Effects of Connecting Plates on Cold-Formed Steel Wall Plate System

2016 ◽  
Vol 858 ◽  
pp. 38-43
Author(s):  
Ng Ling Ying Adeline ◽  
Wei Hui Hii
Keyword(s):  
Failure Mode ◽  
Material Properties ◽  
Experimental Investigations ◽  
Ultimate Capacity ◽  
Pull Out ◽  
Modes Of Failure ◽  
Cold Formed Steel ◽  
Yield Capacity ◽  
Mode Failure ◽  
Plate System

The paper presents experimental investigations on cold-formed steel (CFS) wall plate system. The behavior and the modes of failure of the system under uplift were studied. The parameters tested were the presence of gaps and the thickness of connecting plates. Results showed that samples with and without gaps at the supports experienced the same failure mode. Failure began with the yielding of connecting plates followed by the buckling of C-channel. Similar ultimate capacity was also obtained for samples with and without gaps. When connecting plates of different thicknesses were used to connect the wall-plate, different modes of failure were observed. Instead of yielding in the connecting plates, screw pull-out was observed in the connection before the C-channel buckled. Besides, it was observed that the ultimate capacity of the system was reduced when thicker connecting plates were used. It is not conservative to estimate the capacity of screwed connection according to the design standard and it is proposed that the capacity of the wall plate system is taken as the yield capacity of the connecting plates of the same material properties.

Evaluation of Material Properties of Cold-formed Steel Channel Section with Different Thickness

2016 ◽  
pp. 133-145
Author(s):  
Mohd Syahrul Hisyam Mohd Sani ◽  
Fadhluhartini Muftah ◽  
Ahmad Rasidi Osman ◽  
Mohd Azran Razlan ◽  
Cher Siang Tan
Keyword(s):  
Material Properties ◽  
Channel Section ◽  
Cold Formed Steel ◽  
Different Thickness

scholarly journals Elevated temperature material properties of cold-formed steel hollow sections

2015 ◽  
Vol 90 ◽  
pp. 84-94 ◽  
Author(s):  
Finian McCann ◽  
Leroy Gardner ◽  
Sophie Kirk
Keyword(s):  
Elevated Temperature ◽  
Material Properties ◽  
Cold Formed Steel
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