Fire resistance performance of unprotected wood–wood–wood and wood–steel–wood connections: A literature review and new data correlations

Lei, Peng; Hadjisophocleous, George; Mehaffey, J. R.; Mohammad, Mohammad

doi:10.1016/j.firesaf.2010.08.003

“…Therefore, as a further simplification, M and N are averaged and rounded-off as 0.17 and 0.06 for bolt-type connections, and 0.40 and 0.00 for dowel-type connections, respectively. The values given in Table 1 are found to be a little different in comparison to the values presented in a preliminary analysis [22]. This is due to the fact that new test results have been added to the database and new analyses have been conducted.…”

Section: Www and Wsw Connectionsmentioning

confidence: 77%

On the Fire Performance of Double-shear Timber Connections

Lei¹,

Hadjisophocleous²,

Mehaffey³

et al. 2011

Fire Safety Science - Proceedings of the 10th International Sym

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In heavy timber structures, double-shear connections, including wood-wood-wood (WWW), wood-steelwood (WSW) and steel-wood-steel (SWS) connections with either bolts or dowels as fasteners, are widely used to assembly structural members and transfer loads. However, connections with metal fasteners and components are potentially venerable links in fire exposure. A number of efforts have been devoted to study the fire performance of timber connections in the last two decades. With the knowledge and experimental data generated, new attempts have been made in order to develop new calculation methods and improve design rules for timber connections in fire. In this paper, existing models are discussed and new correlations are presented for the calculation of the fire resistances of double-shear timber connections. Various factors, i.e. timber thickness, fastener diameter, and load ratio are considered in the correlations. Comparison between the predictions using the correlations and the measured results in fire resistance tests shows good agreement. For timber connections with protective membranes, the component additive method (CAM) can be used by adding the additive fire resistances of the protective membranes to the fire resistances of unprotected timber connections. Connections with concealed fasteners and intumescent paint are also discussed in this paper.

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“…The correlation details can be seen in [9]. Table 1 are found to be a little different in comparison to the values presented in a preliminary analysis [22]. This is due to the fact that new test results have been added to the database and new analyses have been conducted.…”

Section: Www and Wsw Connectionsmentioning

confidence: 85%

On the Fire Performance of Double-shear Timber Connections

Peng¹,

Hadjisophocleous²,

Mehaffey³

et al. 2011

Fire Safety Science - Proceedings of the 10th International Sym

View full text Add to dashboard Cite

In heavy timber structures, double-shear connections, including wood-wood-wood (WWW), wood-steelwood (WSW) and steel-wood-steel (SWS) connections with either bolts or dowels as fasteners, are widely used to assembly structural members and transfer loads. However, connections with metal fasteners and components are potentially venerable links in fire exposure. A number of efforts have been devoted to study the fire performance of timber connections in the last two decades. With the knowledge and experimental data generated, new attempts have been made in order to develop new calculation methods and improve design rules for timber connections in fire. In this paper, existing models are discussed and new correlations are presented for the calculation of the fire resistances of double-shear timber connections. Various factors, i.e. timber thickness, fastener diameter, and load ratio are considered in the correlations. Comparison between the predictions using the correlations and the measured results in fire resistance tests shows good agreement. For timber connections with protective membranes, the component additive method (CAM) can be used by adding the additive fire resistances of the protective membranes to the fire resistances of unprotected timber connections. Connections with concealed fasteners and intumescent paint are also discussed in this paper.KEYWORDS: timber, connections, fire resistance, structural design. NOMENCLATURE LISTING

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“…Thomas [73], found the point of tensile failure at 80°C. Konig and Walleij [71], found this point at 100°C and Schaffer [45] at 200°C. At 300°C the wood is completely converted to char and loses all its tensile strength.…”

Section: Tensile Strengthmentioning

confidence: 93%

“…Peng [72], summarized the specific heat values reported by several researchers [71] as shown in Figure 21. Mehaffey [69] and Kong [71] considered a specific heat with a peak at 100-120°C because of the energy required to evaporate the water in the wood.…”

Section: Specific Heatmentioning

confidence: 99%

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Fire Performance of Hybrid Timber Connections

Ali¹

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Wood is being widely used as a construction material; however, the use of wood has been restricted by building codes because it is combustible. Hybrid building systems involve the use of heavy timber in combination with other materials. A hybrid timber connection is considered as the weakest link in this construction system particularly under fire exposure. Analysis of hybrid timber connections is complicated because the behavior and properties of the different materials are different under fire exposure. Fire Performance of Hybrid Timber Connections iv AcknowledgementsMy gratitude goes to the Almighty God for the opportunity, grace and wisdom that has seen me through this Doctorate program.

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Fire resistance performance of unprotected wood–wood–wood and wood–steel–wood connections: A literature review and new data correlations

Cited by 25 publications

References 4 publications

On the Fire Performance of Double-shear Timber Connections

On the Fire Performance of Double-shear Timber Connections

On the Fire Performance of Double-shear Timber Connections

Fire Performance of Hybrid Timber Connections

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