- Conference Paper
Material science has not yet succeeded to fully explain the mechanics of explosive fire spalling. What is missing is a clear definition of the parameters governing explosive spalling to what extent. As a result, the fully material based instructions of EN 1992-1-2  do often not allow for satisfactory identification of explosive spalling issues and to handle explosive spalling in buildings. Nevertheless, no global building failure due to concrete spalling under fire conditions has been observed to the authors’ knowledge. This document presents a general risk-based spalling design approach suitable for application in engineering practice. The approach takes both material behaviour and structural behaviour into account by means of spalling risk classes (SRC). For each SRC, methods for both spalling design and structural ultimate limit state fire design are provided. The different design methods are subdivided into different levels of approximation. The more severe the consequences of explosive spalling are the more precise design methods must be used. The aim of the proposed method is to draw attention in design to the parts of the building where a high probability of spalling actually results in more severe consequences or higher risks, respectively. On the other hand, the use of the proposed method allows avoiding extensive discussions about potential spalling issues for uncritical structural elements. Furthermore, the proposed method provides a means to structural engineers for handling explosive spalling not only by specifying sometimes rather unreliable material properties, but also by accounting for a robust design. Show more
Pages / Article No.
PublisherRISE Research Institutes of Sweden
SubjectExplosive spalling; Spalling design approach; Robustness
Organisational unit09469 - Kaufmann, Walter / Kaufmann, Walter
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