Abstract
A structure may be totally destroyed due to a fire, but often it is only partially damaged and parts of it may still be salvaged and reused. For buildings with significant historic and cultural value, it is of utmost importance that these elements, which were only partially damaged, can still be recovered as to preserve the authenticity of the structure. In the case of timber elements after a fire, it is common to find damage on the cross-section exterior part, whereas the inner part presents still a non-damaged section. Therefore, the element is often found with an exterior irregular shape, either due to its original shape prior decay or due to the exposure to fire, that does not coincide with the inner residual cross-section. Moreover, it is essential to perform a preliminary safety analysis to verify which elements can be preserved and to what extent interventions could be needed. The objective of this work is to apply a methodology that allows to calculate the residual cross-section of partially burnt timber elements structures as to calculate the resistant and apparent sections for geometry assessment and to implement that information in three-dimensional structural models. For this purpose, this work proposes a methodology based on a combination of drilling resistance tests together with laser scanner measurements. The methodology was first tested and calibrated within a controlled laboratory environment and then validated onsite using elements from a building exposed to a past fire. The Casa de Sarmento (Sarmento's House) in Guimarães (Portugal) was used as case study, where various structural damages due to a past fire were found.
Highlights
Throughout history, there are several cases in which historic timber structures were exposed to a fire, such as the recent Notre Dame Cathedral fire (2019)
Even if the elements have been partially burnt, which might have even accentuated prior existing damages, it is important to consider the possibility of maintaining the original struc ture configuration, especially when dealing with historic value build ings. In this case it is essential to obtain the residual cross-section that can be considered for a safety analysis, as well as to perform a structural assessment of the timber structure individually and globally
Non-destructive tests on these timber elements must be made allowing for a proper estimation of the section geometry that remains after a fire
Summary
Throughout history, there are several cases in which historic timber structures were exposed to a fire, such as the recent Notre Dame Cathedral fire (2019). In many of those events, the structure suffers a complete loss of its elements, but there are cases in which damage to the elements is partial or confined to a specific location of the structure When this situation occurs, even if the elements have been partially burnt, which might have even accentuated prior existing damages, it is important to consider the possibility of maintaining the original struc ture configuration, especially when dealing with historic value build ings. Even if the elements have been partially burnt, which might have even accentuated prior existing damages, it is important to consider the possibility of maintaining the original struc ture configuration, especially when dealing with historic value build ings In this case it is essential to obtain the residual cross-section that can be considered for a safety analysis, as well as to perform a structural assessment of the timber structure individually (by element) and globally (whole structure). Non-destructive tests on these timber elements must be made allowing for a proper estimation of the section geometry that remains after a fire
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