Numerical study on structural behaviour of cold-formed steel columns under fire conditions

2013 ◽  
pp. 735-736 ◽  
Keyword(s):  
Numerical Study ◽  
Structural Behaviour ◽  
Steel Columns ◽  
Cold Formed Steel ◽  
Fire Conditions

scholarly journals Buckling behavior of cold-formed steel columns at both ambient temperature and simulated fire conditions

Fire Research ◽  
2016 ◽  
Author(s):  
Hélder D. Craveiro ◽  
João Paulo C. Rodrigues ◽  
Luís M. Laím
Keyword(s):  
Experimental Investigation ◽  
Ambient Temperature ◽  
Cross Sections ◽  
Failure Modes ◽  
Steel Columns ◽  
Buckling Behavior ◽  
Wide Range ◽  
Cold Formed Steel ◽  
Simulated Fire ◽  
Fire Conditions

Cold-formed steel (CFS) profiles with a wide range of cross-section shapes are commonly used in building construction industry. Nowadays several cross-sections can be built using the available standard single sections (C, U, Σ, etc.), namely open built-up and closed built-up cross-sections. This paper reports an extensive experimental investigation on the behavior of single and built-up cold-formed steel columns at both ambient and simulated fire conditions considering the effect of restraint to thermal elongation. The buckling behavior, ultimate loads and failure modes, of different types of CFS columns at both ambient and simulated fire conditions with restraint to thermal elongation, are presented and compared. Regarding the buckling tests at ambient temperature it was observed that the use of built-up cross-sections ensures significantly higher values of buckling loads. Especially for the built-up cross-sections the failure modes were characterized by the interaction of individual buckling modes, namely flexural about the minor axis, distortional and local buckling. Regarding the fire tests, it is clear that the same levels of restraint used in the experimental investigation induce different rates in the generated restraining forces due to thermal elongation of the columns. Another conclusion that can be drawn from the results is that by increasing the level of restraint to thermal elongation the failure of the columns is controlled by the generated restraining forces, whereas for lower levels of restraint the temperature plays a more important role. Hence, higher levels of imposed restraint to thermal elongation will lead to higher values of generated restraining forces and eventually to lower values of critical temperature and time.

Experimental and numerical study on the fire response of cold-formed steel beams with elastically restrained thermal elongation

2016 ◽  
Vol 7 (4) ◽  
pp. 388-402 ◽  
Author(s):  
Luis Laím ◽  
João Paulo C. Rodrigues
Keyword(s):  
Cross Sections ◽  
Failure Modes ◽  
Numerical Study ◽  
Research Work ◽  
Experimental Tests ◽  
Steel Beams ◽  
Structural Behaviour ◽  
Content Type ◽  
Axial Forces ◽  
Cold Formed Steel

Purpose This paper is mainly aimed at the structural performance of compound cold-formed galvanised steel beams under fire conditions based on the results of a large programme of experimental tests and numerical simulations. The main objective of this research was to assess the critical temperature and time of the studied beams. Other important goals of this research work were to investigate the influence of the cross-sections (C, lipped-I, R and 2R beams) and, above all, of the axial restraint (0, 0.45, 3, 7.5, 15, 30, ∞ kN/mm) to the thermal elongation of the beam and the rotational restraint at beam supports (0, 15, 80, 150, 300, 1,200 and ∞ kN.m/rad) on the fire resistance of this kind of beams. Design/methodology/approach This paper still provides details of the simulation methodology for achieving numerical stability and faithful representation of detailed structural behaviour and compares the simulation and experimental results, including beam failure modes, measured beam axial forces and beam mid-span deflections. Findings Good agreement between Abaqus simulations and experimental observations confirms that the finite element models developed with the Abaqus/standard solver are suitable for predicting the structural fire behaviour of restrained cold-formed steel beams. Originality/value The results showed above all that the effect of the stiffness of the surrounding structure seems to decrease with the increasing slenderness of the beams.

scholarly journals Full-scale experimental and numerical study about structural behaviour of a thin-walled cold-formed steel building affected by ground settlements due to land subsidence

2015 ◽  
Vol 372 ◽  
pp. 141-144 ◽  
Author(s):  
J. A. Ortiz ◽  
L. A. Hernández ◽  
M. Hernández ◽  
J. Pacheco ◽  
M. E. Zermeño ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Numerical Study ◽  
Full Scale ◽  
Water Withdrawal ◽  
Angular Distortion ◽  
Structural Behaviour ◽  
Steel Building ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Ground Settlements

Abstract. Land subsidence due to ground water withdrawal is a problem in many places around the world (Poland, 1984). This causes differential ground settlements that affect masonry structures, because these structural materials do not exhibit an adequate performance beyond a certain level of angular distortion. This work presents the experimental and numerical results about a study regarding the performance of a full-scale thin-walled cold-formed steel building affected by ground differential settlements due to land subsidence. The experimental stage consisted in the construction of a test-building to be subjected to differential settlements in laboratory. The numerical stage consisted in performing a numerical non-linear static pull-down analysis simulating the differential ground settlements of the test-building. The results show that the structural performance of the tested building was very suitable in terms of ductility.

NUMERICAL STUDY OF SHEATHED COLD-FORMED STEEL COLUMNS

2018 ◽  
Author(s):  
Constantinos Kyprianou ◽  
◽  
Pinelopi Kyvelou ◽  
Leroy Gardner ◽  
David A. Nethercot ◽  
...  
Keyword(s):  
Numerical Study ◽  
Steel Columns ◽  
Cold Formed Steel

Cold-formed steel columns at both ambient and fire conditions

2018 ◽  
Vol 9 (3) ◽  
pp. 189-202 ◽  
Author(s):  
Hélder Craveiro ◽  
João Paulo Correia Rodrigues ◽  
Luis Laim
Keyword(s):  
Cross Section ◽  
Critical Temperatures ◽  
Content Type ◽  
Steel Columns ◽  
Channel One ◽  
Steel Members ◽  
Current Design ◽  
Cold Formed Steel ◽  
Support Conditions ◽  
Fire Conditions

Purpose The use of cold-formed steel members has increased significantly in the past few years; however, its design is only briefly addressed in the current design codes, such as the EN 1993-1-3. To evaluate the compressive behavior of single and built-up cold-formed steel members, at ambient and simulated fire conditions with restrained thermal elongation, experimental and numerical tests were undertaken. Design/methodology/approach Four cross-section shapes were tested, namely, one single (lipped channel), one open built-up (I) and two closed built-up (R and 2R), considering two end support conditions, pinned and fixed. Two test set-ups were specifically developed for these tests. Based on the experimental results finite element models were developed and calibrated to allow future parametric studies. Findings This paper showed that increasing the level of restraint to thermal elongation and the initially applied load led to lower critical temperatures. Increasing the level of restraint to thermal elongation, the failure is governed by the generated axial restraining forces, whereas for lower levels of restraint to thermal elongation, the failure is controlled by the temperature increasing. Originality/value This paper is a contribution to the knowledge on the behavior of cold-formed steel columns subjected to fire, especially on the ones with a built-up cross-section, where results on thermal restrained ones are still scarce. It presented a set of experimental and numerical results useful for the development of numerical and analytical analysis concerning the development of new simplified calculation methods.

A numerical study of thermal behavior of CASTOR RBMK-1500 cask under fire conditions

2021 ◽  
Vol 376 ◽  
pp. 111131
Author(s):  
Robertas Poškas ◽  
Povilas Poškas ◽  
Kęstutis Račkaitis ◽  
Renoldas Zujus
Keyword(s):  
Thermal Behavior ◽  
Numerical Study ◽  
Fire Conditions
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