Brandversuche an brettschichtverleimten Holzträgern unter Biegebeanspruchung

Dorn, Hans; Egner, K.

doi:10.1007/bf02615681

Cited by 13 publications

(4 citation statements)

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“…Resorcinol-formaldehyde (RF) and phenol-resorcinol-formaldehyde (PRF) adhesives have been used for decades for bonding load-bearing timber components. Fire tests performed in the past with glued laminated timber beams bonded with RF and PRF adhesives never led to concerns about failure of the gluelines (Dorn andEgner 1961, 1967;Dreyer 1969). Therefore a reference series of oven tests was performed with specimens bonded with the resorcinolformaldehyde adhesive Kauresin 460.…”

Section: Introductionmentioning

confidence: 99%

Shear behaviour of bond lines in glued laminated timber beams at high temperatures

Frangi

Fontana

Mischler

2004

Wood Science and Technology

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A comprehensive research project has been carried out at the Swiss Federal Institute of Technology (ETH) on the fire behaviour of timber-concrete composite slabs (Frangi and Fontana 2000). The glued laminated timber beams used for the fire tests were bonded with a one-component polyurethane (1-K-PUR) adhesive. As one fire test on a slab showed an unexpected shear failure of a glued laminated timber beam, a series of tests was carried out to study the shear behaviour of different types of adhesives at high temperatures. The first part of the paper describes the results of the shear tests at elevated temperatures, in the second part the shear test results are compared to the fire test on a slab.

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Section: Introductionmentioning

confidence: 99%

Shear behaviour of bond lines in glued laminated timber beams at high temperatures

Frangi

Fontana

Mischler

2004

Wood Science and Technology

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“…The reason is that the tested specimens were cut from central section of the glulam and the temperature within central section increased slowly and remained steady due to char layer formation during the fire exposure test. Dorn and Eg- ner [17], and Dreyer [18] also reported that fire tests performed with glued laminated timber beams bonded with RF and PRF (phenol-resorcinol-formaldehyde) adhesives did not show results that would lead to concerns about failure of the gluelines. On the other hand, there are indications that epoxy based adhesives are sensitive to heat [19,20].…”

Section: Compression Strength Of Glulam After Fire Exposurementioning

confidence: 97%

Effect of fire exposure on the mechanical properties of glued laminated timber

et al. 2009

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“…Fire tests performed with glued laminated timber beams bonded with RF and PRF adhesives never led to concerns about failure of the adhesive [9][10][11]. Nyman [12] studied the influence of temperature and moisture on the strength of timber and bonded joints and found that the timber strength was more sensitive to an increase in temperature than the RF adhesive.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Adhesive on the Load-Carrying Capacity of Glued Laminated Timber Members in Fire

Klippel¹,

Frangi²,

Fontana³

2011

Fire Saf. Sci.

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Design models for timber structures in fire usually take into account the loss in cross-section due to charring and the temperature-dependent reduction in strength of timber. For bonded timber elements like glued laminated timber beams it is assumed that the adhesive used does not influence the resistance of structural timber beams significantly. To investigate the fire resistance of bonded timber elements a comprehensive research project is currently in progress at the Institute of Structural Engineering of ETH Zurich, Switzerland. The aim of this research project is the development of a simplified design model for the fire resistance of bonded structural timber elements taking into account the behavior at elevated temperature of the adhesive used. This paper presents experimental analyses and results of first calculations performed on the influence of the adhesive on the load-carrying capacity of glued laminated timber members in fire. It is shown that the temperature-dependent material properties of the adhesive used in the bondline of glued laminated timber beams have small influence on the shear resistance. For the investigated timber beams failure occurs mainly due to exceeding the bending moment resistance. Because of the steep temperature gradient in timber beams during fire exposure the temperature in the inner region of the cross-section is rather low; hence the shear capacity in the bondline between the different lamellas is still sufficient. However, in case of finger jointed lamellas of glued laminated timber beams, the influence of adhesive used in the finger joints is more significant and has to be considered. Tensile tests at elevated temperatures on finger jointed specimens confirmed the significant influence of the adhesive used.

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Brandversuche an brettschichtverleimten Holzträgern unter Biegebeanspruchung

Cited by 13 publications

References 0 publications

Shear behaviour of bond lines in glued laminated timber beams at high temperatures

Shear behaviour of bond lines in glued laminated timber beams at high temperatures

Effect of fire exposure on the mechanical properties of glued laminated timber

Influence of the Adhesive on the Load-Carrying Capacity of Glued Laminated Timber Members in Fire

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