Composite Action Between Cold-Formed Steel Beams and Wood-Based Floorboards

Kyvelou, Pinelopi; Gardner, Leroy; Nethercot, D.A.

doi:10.1142/s0219455415400295

Cited by 36 publications

(33 citation statements)

References 9 publications

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“…Observing a similar trend in the carbon steel data assembled herein, εu was also considered to depend on the ratio of yield stress fy to ultimate tensile stress fu. The experimental ultimate strains εu are plotted against the corresponding fy/fu ratios for the data from 537 hot-rolled and 272 cold-formed [41,43,45,[71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87] carbon steel tensile coupon tests, as shown in Fig. 5.…”

Section: Predictive Expressions For εU and εShmentioning

confidence: 99%

Stress-strain curves for hot-rolled steels

Yun

Gardner

2017

Journal of Constructional Steel Research

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370

190

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The use of advanced analytical and numerical modelling in structural engineering has increased rapidly in recent years. A key feature of these models is an accurate description of the material stress-strain behaviour. Development of standardised constitutive equations for the full engineering stress-strain response of hot-rolled carbon steels is the subject of the present paper.The proposed models, which offer different options for the representation of the strain hardening region, feature an elastic response up to the yield point, followed by a yield plateau and strain hardening up to the ultimate tensile stress. The Young's modulus E, the yield stress fy and the ultimate stress fu are generally readily available to the engineer, but other key parameters, including the strains at the onset of strain hardening and at the ultimate stress, are not, and hence require predictive expressions. These expressions have been developed herein and calibrated against material stress-strain data collected from the literature. Unlike the widely used ECCS model, which has a constant length of yield plateau and constant strain hardening slope, the proposed models, reflecting the collected test data, have a yield plateau length and strain hardening characteristics which vary with the ratio of yield to ultimate stress (i.e. with material grade). The proposed models require three basic input parameters (E, fy and fu), are simple to implement in analytical or numerical models, and are shown herein to be more accurate than the widely employed ECCS model. The proposed models are based on and hence representative of modern hot-rolled steels from around the world.

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Section: Predictive Expressions For εU and εShmentioning

confidence: 99%

Stress-strain curves for hot-rolled steels

Yun

Gardner

2017

Journal of Constructional Steel Research

Self Cite

370

190

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“…The key measured material properties of the 3 mm thick cold-formed steel are listed in Table 2, together with those of the previously tested 1.5 mm material (Kyvelou et al 2015). It may be observed that the proof strength σ 0.2 of the corner coupons is, on average, 17% higher than that of the flat coupons.…”

Section: Tensile Steel Coupon Testsmentioning

confidence: 97%

“…A detailed explanation of the tensile coupon testing procedure, which was conducted according to BS EN ISO 6892-1 (CEN 2009), is presented by Kyvelou et al (2015). The measured material stress-strain curves, up to 2% strain, are illustrated in Fig.…”

Section: Tensile Steel Coupon Testsmentioning

confidence: 99%

“…A preliminary experimental investigation performed by Kyvelou et al (2015) on cold-formed steel beams of 1.5 mm thickness connected to wood-based floorboards showed that there is potential for significant improvement in the mechanical behavior of these systems if composite action can be mobilized; the key results of this investigation are summarized herein. These preliminary tests are supplemented by a series of additional experiments in the present paper -these include material tests to determine the basic stress-strain characteristics of the tested elements, beam tests carried out on similar flooring systems to those presented by Kyvelou et al (2015) but employing cold-formed steel joists of 3 mm thickness and pushout tests to examine the load-slip characteristics at the steel-to-board interface considering both 1.5 mm and 3.0 mm thick steel.…”

Section: Introductionmentioning

confidence: 98%

“…These preliminary tests are supplemented by a series of additional experiments in the present paper -these include material tests to determine the basic stress-strain characteristics of the tested elements, beam tests carried out on similar flooring systems to those presented by Kyvelou et al (2015) but employing cold-formed steel joists of 3 mm thickness and pushout tests to examine the load-slip characteristics at the steel-to-board interface considering both 1.5 mm and 3.0 mm thick steel. The key variable in the beam tests, and mirrored in the push-out tests, is the shear connection between the steel joists and the wood-based floorboards.…”

Section: Introductionmentioning

confidence: 99%

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Testing and Analysis of Composite Cold-Formed Steel and Wood−Based Flooring Systems

2017

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An experimental study has been conducted into the degree of composite action that can arise between cold-formed steel joists and wood-based flooring panels. A series of material, pushout and four-point bending tests have been carried out, and alternative means of shear connection, featuring fasteners and adhesives, have been investigated. It has been found that the spacing of the fasteners as well as the application of structural adhesive at the beam-board interface has a significant influence on the attained degree of shear connection and hence the moment capacity and flexural stiffness of the system. The highest degree of shear connection (up to about 60%) was obtained using the structural adhesive, bringing corresponding increases in capacity and stiffness of around 100% and 40% respectively over the bare steel.Smaller, but still very significant, increases in capacity and stiffness were achieved through the use of screws alone. Based on the results of the push-out tests, a load-slip relationship for screw fasteners in wood-based floorboards has been proposed; this is designed for use in future analytical and numerical models. The findings of this research demonstrate, for the first time, the benefits, in terms of enhanced structural performance and efficiency of material use, that can be derived through the practical exploitation of composite action in cold-formed steel flooring systems.

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Zum Tragverhalten von mechanischen Verbindungsmitteln in Stahl‐Holz‐Verbunddecken

Krinitzki,

Hartz

2024

Bautechnik

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Im Kontext der nachhaltigen Tragwerksplanung wird am Lehrstuhl Tragkonstruktionen der TU Dortmund aktuell an einer Stahl‐Holz‐Verbunddecke (SHV) geforscht. Die Leistungsfähigkeit des Deckensystems hängt neben den verwendeten Materialien insbesondere von der konstruktiven Durchbildung der Verbundfuge ab. Demnach wurden zu Beginn der Forschungsarbeiten verschiedene Fugenkonfigurationen mit reversiblen mechanischen Verbindungsmitteln experimentell untersucht. Im Zuge der durchgeführten Abscherversuche konnten die Vorzüge von senkrecht zur Holzfaser eingebrachten Holzschrauben (HS) im Vergleich zu selbstbohrenden Blechbohrschrauben (BS) sowie geneigt eingebrachten Holzschrauben festgestellt werden. Die senkrecht installierten Holzschrauben wiesen eine vergleichsweise hohe Verbundsteifigkeit sowie einen ausgeprägt duktilen Versagensmechanismus bei gleichzeitig geringem Montageaufwand auf. Dementsprechend werden in zukünftigen versuchstechnischen Untersuchungen zur Erfassung des Biegetragverhaltens der Stahl‐Holz‐Verbunddecke überwiegend senkrecht eingebrachte Holzschrauben zur Sicherstellung des Verbunds vorgesehen.

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Composite Action Between Cold-Formed Steel Beams and Wood-Based Floorboards

Cited by 36 publications

References 9 publications

Stress-strain curves for hot-rolled steels

Stress-strain curves for hot-rolled steels

Testing and Analysis of Composite Cold-Formed Steel and Wood−Based Flooring Systems

Zum Tragverhalten von mechanischen Verbindungsmitteln in Stahl‐Holz‐Verbunddecken

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