Local Site Effects in Definition of Seismic Design Parameters for Historical Monuments
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EARTHQUAKE-RESISTANT CONSTRUCTION LOCAL SITE EFFECTS IN DEFINITION OF SEISMIC DESIGN PARAMETERS FOR HISTORICAL MONUMENTS
UDC 624.131.522 J. Bojadjieva, V. Sheshov, K. Edip, and D. Dojchinovski Ss. Cyril and Methodius University, Institute of Earthquake Engineering and Engineering Seismology, Skopje, Macedonia, *Corresponding author Email: [email protected].
Presented in this paper are investigations related to local site conditions carried out for seismic assessment of two historical structures in Macedonia: the Church of the Holy Mother of God Peribleptos dating back to the 13th Century and located in the old town of Ohrid, and the Mustafa Pasha Mosque in Skopje dating back to the 15th Century. The objective of the described procedure has been to take into consideration the regional and microlocation geological and seismological parameters in order to define the input seismic parameters for dynamic analysis of the historical structures. The obtained results have pointed out the significance of involving local site conditions in seismic assessment and retrofitting of historical structures in general. The procedure has been applied to many buildings of historical importance requiring strengthening and rehabilitation with great success and efficiency. Introduction Being located in the Central Balkan region, Macedonia is characterized by a significant cultural and historical heritage, which has experienced many earthquakes causing a lot of damages during their lifetime. Historical monuments have either collapsed or have retained their stability with damages. In this context, it is very important to assess the seismic resistance of these historical monuments in order to enable their further existence. A comprehensive methodology for seismic risk assessment of historical masonry buildings has been developed in the Institute of Earthquake Engineering and Engineering Seismology (IZIIS) for over 40 years [1, 2]. The procedure involves field, laboratory, and numerical studies to be performed in compliance with the latest achievements in the field of earthquake engineering. This paper is mainly focused on local soil conditions and their influence on the definition of seismic input. The concept involves seismic hazard analysis-regional approach, in-situ and laboratory investigations (microlocation approach, modelling of local soil conditions and performing site response analysis of representative geodynamic models), and evaluation of seismic input and definition of seismic risk. These aspects are presented in detail in this paper through two chosen case studies of very unique and specific types of historical monuments: the Mustafa Pasha Mosque in Skopje from the 15th Century and the Church of the Holy Mother of God Peribleptos from the 13th Century, located in the old town of Ohrid. Description Of The Applied Methodology Earthquake hazard definition for urban areas is the first and the most important step towards seismic risk analysis and mitigation strategy [3]. While defining seismic parameters, one would like to qua
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