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Post-Fire Rehabilitation of CLT
RISE Research Institutes of Sweden, Safety and Transport, Safety Research.ORCID iD: 0000-0002-7663-1525
RISE Research Institutes of Sweden, Safety and Transport, Safety Research.ORCID iD: 0000-0001-8670-062x
RISE Research Institutes of Sweden, Safety and Transport, Safety Research.
2021 (English)Report (Other academic)
Abstract [en]

Engineered mass timber materials such as CLT have been increasingly implemented as a structural material for tall or larger buildings in recent years. Most studies have been conducted on the structural performance of timber exposed to fire, but the number of studies focusing on post-fire rehabilitation of mass timber have been limited. As increasingly large timber buildings are being realized, for insurance purposes it becomes increasingly important to ensure that a building can be repaired after a fire. This report presents a case study of the repair of a section of a CLT ceiling after a significant fire. The specimen is obtained from a recent compartment fire test and is positioned and oriented in a way that is representative for on site rehabilitation. The repair was done in six steps: 1. Mapping the thickness of the charred or damaged layer 2. Design and planning 3. Removal of the char layer 4. Planing of the surface including corners 5. Gluing procedure of replacing lamella 6. Finish the surface to meet architectural requirement A new method for determining the grade of damage, the method for planing the specimen, the adhesive type, the glue pressing methods were designed for the rehabilitation exercise. In addition, the layup of the CLT is changed to prioritise flexural stiffness and bending capacity over shear capacity, as they generally govern the structural capacity of CLT floors. After the six-step repair was done, the specimen was cut in half to perform two similar structural bending tests. The results indicate that the flexural stiffness which is generally governing the load bearing capacity of floors, is fully restored by the rehabilitation work. The results also indicate that bending capacity, which can be governing for relatively short floor spans, is restored and possibly increased by the rehabilitation work. The shear capacity which is only critical for short floor spans in combination with very high loads is, however, reduced, as the experimental shear capacity is 18% lower than the characteristic shear capacity.

Place, publisher, year, edition, pages
2021. , p. 33
Series
RISE Rapport ; 2021:67
Keywords [en]
Repair, char, timber, fire, damage
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:ri:diva-58152ISBN: 978-91-89385-57-3 (electronic)OAI: oai:DiVA.org:ri-58152DiVA, id: diva2:1627124
Available from: 2022-01-12 Created: 2022-01-12 Last updated: 2023-05-22Bibliographically approved

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Brandon, DanielSjöström, Johan

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