Experimental investigation of the behaviour of a steel sub-frame under a natural fire

Santiago, Aldina; Silva, Luís Simões da; Vaz, Gilberto C.; Real, Paulo Vila; Lopes, António Gameiro

doi:10.12989/scs.2008.8.3.243

Cited by 29 publications

(21 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pool fires were used to expose single portals to localized heating, with the columns remaining relatively cool, and the response and failure modes of the structure were observed. Santiago et al (2008) present details of a unique testing facility and a series of tests on six steel 'sub-frames' under a 'natural fire' at the University of Coimbra, Portugal, using a custom designed array of gas burners. These tests were intended to provide insight into the influence of various connection types on the behavior of steel substructures in fire.…”

Section: Fire Tests On Portal Frames and Sub-frame Assembliesmentioning

confidence: 99%

“…The University Coimbra, Portugal, has a unique 'natural fire' testing rig which is capable of testing steel subframe assemblies under exposure to gas burners with the ability to spatially and temporally vary the thermal insult to loaded test assemblies (Santiago et al 2008). Tests performed using this facility are briefly described above in Section 3.2.…”

Section: Unusual Custom Made or Modified Furnacesmentioning

confidence: 99%

See 1 more Smart Citation

A contemporary review of large-scale non-standard structural fire testing

2013

View full text Add to dashboard Cite

In recent years, large-scale structural fire testing has experienced something of a renaissance. After about a century with the standard fire resistance test being the predominant means to characterize the response of structural elements in fires, both research and regulatory communities are confronting the many inherent problems associated with using simplified single element tests, on isolated structural members subjected to unrealistic temperature-time curves, to demonstrate adequate structural performance in fires. As a consequence, a shift in testing philosophy to large-scale non-standard fire testing, using real rather than standard fires, is growing in momentum. A number of custom made, non-standard testing facilities have recently been constructed or are nearing completion. Non-standard fire tests performed around the world during the past three decades have identified numerous shortcomings in our understanding of real building behavior during real fires; in most cases these shortcomings could not have been observed through standard furnace tests. Supported by a grant from the Fire Protection Research Foundation, this paper presents a review of relevant non-standard structural fire engineering research done at the large-scale around the world during the past few decades. It identifies gaps and research needs based both on the conclusions of previous researchers and also on the authors' own assessment of the information presented. A review of similar research needs assessments carried out or presented during the past ten years is included. The overarching objective is to highlight gaps in knowledge and to help steer future research in structural fire engineering, particularly experimental research at the large-scale.

show abstract

Section: Fire Tests On Portal Frames and Sub-frame Assembliesmentioning

confidence: 99%

Section: Unusual Custom Made or Modified Furnacesmentioning

confidence: 99%

A contemporary review of large-scale non-standard structural fire testing

2013

View full text Add to dashboard Cite

show abstract

“…The corresponding non-dimensional axial and rotational restraint ratios are given by: b a ¼ K a;c K a;b ¼ 0:267 and b r ¼ K r;c K r;b ¼ 7:460; where K a,b and K r,b are the axial and the rotational stiffnesses of the beam and K a,c and K r,c are the axial and the rotational stiffnesses of the columns at the beam level [22]. The beam was assumed exposed to the fire load, while the columns were unexposed and thermally protected.…”

Section: Structural Modelmentioning

confidence: 99%

“…Additionally, the influence of different joint typologies is also assessed. The accuracy of the analysis is checked by comparison with the results from experimental fire tests carried out by the authors [22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of the Influence of Joint Typologies on the 3D Behaviour of a Steel Sub-Frame Under a Natural Fire

2009

Self Cite

View full text Add to dashboard Cite

In order to address the complex loading condition of steel joints in fire, and based on the experimental fire tests on steel frames with different joint typologies, performed at the University of Coimbra ), a detailed threedimensional model was developed and calibrated to simulate the behaviour of welded and bolted end plate beam-to-column joints. The structural frame is modeled combining 3D shell, solid and joint elements, thereby taking into account the effect of the local failure modes, and the realistic behaviour of the frame exposed to a natural fire. The numerical model accounts for the initial geometrical imperfections, non-linear temperature gradient, geometrical and material nonlinearity and temperature dependent material properties. The results show the performance of each individual structural joint component under heating and cooling conditions and identify the main dependencies of the geometrical and mechanical variables of the components on the joint behaviour. The global behaviour of the frame and the joint failure modes are compared and discussed with the experimental observations.

show abstract

“…Over the past few years, one of the main achievements of structural steel research has been the development of the new engineering methods of analysis and design that take into account the real conditions of fire and the real fire resistance of steel structures ( [3], [4], [5]). Such methods allow safer and more economical design and construction of steel structures.…”

Section: Introductionmentioning

confidence: 99%

Sub-Frames With Reverse Channel Connections to CFT Composite Columns –Experimental Evaluation

Lopes¹,

Santiago²,

Silva³

et al. 2015

Volume 11 Number 1

Self Cite

View full text Add to dashboard Cite

This paper presents the experimental results of the investigation on the coupled joint-structure behaviour of the composite sub-frame, using the reverse channel connections between an I-beam and the concrete filled tube (CFT) columns. This experimental programme includes seven full-scale tests: three tests at ambient temperature and four tests under heating-cooling curves. The parametric study was dedicated to: temperature-time curve and channel wall thickness (8, 10 and 12 mm).The main objective of these tests is to provide experimental information on the behaviour of the reverse channel joints and its influence on the structure under a heating-cooling fire. The restraining effects from the unaffected part of surrounding structure induce highly variable loading histories on the joints during fire; therefore the investigation on coupled joint-structure behaviour should lead to a realistic prediction of progressive collapse of the structure.

show abstract

Experimental investigation of the behaviour of a steel sub-frame under a natural fire

Cited by 29 publications

References 4 publications

A contemporary review of large-scale non-standard structural fire testing

A contemporary review of large-scale non-standard structural fire testing

Numerical Modelling of the Influence of Joint Typologies on the 3D Behaviour of a Steel Sub-Frame Under a Natural Fire

Sub-Frames With Reverse Channel Connections to CFT Composite Columns –Experimental Evaluation

Contact Info

Product

Resources

About