Abstract
The results of an experimental programme on the structural behaviour, fire behaviour, and fire resistance of CLT rib panels are presented. The floor system consists of cross-laminated timber (CLT) plates rigidly bonded to glued-laminated timber ribs by means of screw-press gluing.The experimental programme comprised ultimate-load tests at normal temperature as reference tests and full-scale fire resistance tests on four cross-sections. In addition to the reference tests, shear tests of the glue line between CLT plate and glued-laminated timber rib were performed for analysis of the cross-sections’ composite action.The results of the reference tests show good agreement with results based on the simplified method according to EN 1995-1-1 [1] and its final draft of CLT design [2]. The importance of the glue line’s quality was confirmed. The fire resistance tests show results on the safe side compared to predictions of the fire behaviour according to EN 1995-1-2 [3] and its actual draft [4]. However, the fire resistance was underestimated due to conservative assumptions about the composite cross-section’s structural behaviour.The experimental programme addressed the fire behaviour and fire resistance of CLT rib panels currently not covered in standards. The project’s overall aim is the development of design rules in fire for EN 1995-1-2.
Highlights
The demand for sustainable buildings is increasing and will continue to grow in the foreseeable future
This paper presents the results of an experimental programme comprising ultimate-load tests at normal temperature as reference tests and full-scale fire resistance tests on four cross-sections
In the ultimate-load tests at normal temperature, the experimental loadbearing capacity of test specimens tested as T-sections showed very good agreement with the estimated loadbearing capacity, using the effective width according to EN 1995-1-1:20xx [2]
Summary
The demand for sustainable buildings is increasing and will continue to grow in the foreseeable future. For long-span floor systems, the loadbearing capacity of CLT panels can be increased using ribbed cross-sections of timber composite structures. Shear tests of the glue line between CLT plate and glulam rib were performed for further analysis of the composite action. In the full-scale fire tests, particular attention was given to the fire behaviour and the composite action of the cross-section. For some applications (e.g. buildings of higher consequence classes) authorities may require a performance based design including the verification of burnout. In this case, the influence of exposed timber surfaces on fire dynamics in compartments needs to be considered [7,8,9]
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