مشخصات پژوهش

Historical buildings (HBs) not only encapsulate the cultural heritage and civilization of a region but also serve as invaluable legacies passed down by our ancestors. Consequently, their conservation, maintenance, and rehabilitation are essential to ensure their longevity for future generations. This study aims to employ the supervised ambient vibrations technique to assess the pathology and vulnerability of HBs, thereby mitigating the risks posed by concealed hazards. Specifically, the structural integrity of the Vakil Mosque, an architectural masterpiece dating back to 1773, was evaluated through experimental analysis. Due to restrictions imposed by the Cultural Heritage Organization and the lack of access to accurate mechanical and material properties of the Vakil Mosque, ambient vibration measurements were focused to the available results from the testing campaign. These signals were subsequently processed using the floor spectral ratio (FSR), random decrement method (RDM), and horizontal-to-vertical spectral ratio (HVSR) techniques to investigate the influence of the soil-structure resonance (SSR) phenomenon on the building. Additionally, the mosque’s natural frequency was estimated in accordance with ASCE standards. The collated and processed data from the testing campaign manifested that the fundamental natural frequency of the mosque closely corresponds to the predominant natural frequency of the site. The obtained results also revealed that the SSR phenomenon has not only increased the structural vulnerability but also poses a persistent threat to the structural stability of the mosque. In light of these findings, it is imperative that historical building codes integrate a comprehensive assessment of SSR effects on the pathology and vulnerability of heritage buildings. Thus, implementing the proposed methodology is essential for safeguarding these treasured monuments and mitigating potential structural risks.