Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Progressive Strength Loss of Fire Retardant Treated Lumber: A Case Study
Renovation of a restaurant in a suburban shopping center revealed numerous fractures in the prefabricated wood roof trusses. The building was constructed in the mid-1980s, and was about 30 years old at the time of renovation. The fractures were consistent with progressive strength loss attributable to fire-retardant treatment (FRT) chemicals that were commonly used in the 1980s. Several repair and strengthening schemes were considered, leading to the conclusion that the compromised trusses needed to be replaced in their entirety. This paper describes the discovery, diagnosis, and documentation of the FRT-induced distress, as well as the analysis and decision process that led to full replacement in lieu of retrofit. Additional background information on FRT lumber is provided, including a similar case study and prior laboratory testing performed by one of the authors. Unique characteristics of this case included a variety of service environments that ranged from conditioned space in an open-ceiling portion of the restaurant to un-conditioned attic space. Additional notable details of the retrofit are also discussed including the need to bring the roof into compliance with current energy code requirements, and challenges faced during replacement of the weakened roof structure.
Progressive Strength Loss of Fire Retardant Treated Lumber: A Case Study
Renovation of a restaurant in a suburban shopping center revealed numerous fractures in the prefabricated wood roof trusses. The building was constructed in the mid-1980s, and was about 30 years old at the time of renovation. The fractures were consistent with progressive strength loss attributable to fire-retardant treatment (FRT) chemicals that were commonly used in the 1980s. Several repair and strengthening schemes were considered, leading to the conclusion that the compromised trusses needed to be replaced in their entirety. This paper describes the discovery, diagnosis, and documentation of the FRT-induced distress, as well as the analysis and decision process that led to full replacement in lieu of retrofit. Additional background information on FRT lumber is provided, including a similar case study and prior laboratory testing performed by one of the authors. Unique characteristics of this case included a variety of service environments that ranged from conditioned space in an open-ceiling portion of the restaurant to un-conditioned attic space. Additional notable details of the retrofit are also discussed including the need to bring the roof into compliance with current energy code requirements, and challenges faced during replacement of the weakened roof structure.
Progressive Strength Loss of Fire Retardant Treated Lumber: A Case Study
Mulea, Carmen C. (Autor:in) / Drerup, Michael J. (Autor:in)
Eighth Congress on Forensic Engineering ; 2018 ; Austin, Texas
Forensic Engineering 2018 ; 903-913
27.11.2018
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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