1st Croatian Conference on Earthquake Engineering 1CroCEE 2021

This work presents a systematic and comprehensive review of all up-to-date official seismic hazard zonation maps and design codes for the Former Yugoslav (FY) counties. Discussed are different methodologies for calculating seismic design forces related to the different design codes and presented are the methodological and outcome differences. Official seismic zoning maps are recompiled in a uniform GIS manner, enabling easy visualization and tracking of spatial differences. The implications of different design codes and seismic zoning maps are significant, discussed through variations of seismic design force value on selected particular building samples.

FY countries have a more than 70 years history of implementation of official design codes. The first official building code was enforced in 1948 with Provisional Technical Regulations for Loading of Structures (OGoFNRY No. 61/48 of July 17, 1948). The second edition of the building code was published in 1964 with Provisional Technical Regulations for Construction in Seismic Regions (OGoSFRY No. 39/64 of September 30, 1964). In 1981, the third and in some FY counties still valid administrative edition was put on force through Technical Regulations for Construction of Buildings in Seismic Regions (OGoSFRY No. 31/81 of June 5, 1981, with Amendments 49/82, 29/83, 21/88, and 52/90). Today, most FY countries have adopted Eurocodes as official design code with single or parallel implementation. Along with the design codes, for this region, 13 different seismic zoning maps were in official use up-to-date, 6 of them related to the period 1948-1990 and 7 EC-8 seismic zoning maps.

The concept of design codes, as well as seismic zonation, has a direct impact on the seismic risk of the built environment. Starting from this point, we believe that it is necessary to review all up-to-date official seismic design codes and seismic zonation maps, building ground for further research and analysis in the domain of seismic risk assessment.