Condition Assessment of Steel Riveted Roof of Heritage Building in Sofia, Bulgaria

Abstract

The findings of a recent survey on the steel roof structure of an early-twentieth-century building located in Sofia, Bulgaria are reported. The steel roof structure is supported by solid masonry walls around the building perimeter and on slender cast-iron columns along two interior longitudinal lines. The south part of the building was severely damaged during the bombing raids over Sofia in WWII. The building underwent a major refurbishment within the 1995-2000 period accompanied by detailed survey and condition assessment of the steel roof structure. In 2020 the authors carried out a survey for condition assessment of the steel roof structure including checks of riveted connections, analysis of chemical composition by OES metal analyser and inspection of the roof cladding components by endoscopic device.