Armen Assatourians - Earthquake Engineering Research Consultant, Yerevan, Armenia
Mohammad Reza Mehrdoust - Earthquake Engineer, Head of North-East branch of BHRC, Mashhad, Iran
Sohrab Fallahi - Senior Structural Designer, E.S.S. Consulting Eng. Co., Tehran, Iran

Widely distributed 111 series, 10 story R.C. frame buildings are constructed during former Soviet Union in Armenia and Nagorno-Karabakh province. In current research we illustrate the concept of seismic upgrading of above mentioned buildings, using an Additional Isolated Upper Floor (AIUF). For this purpose, a three dimensional of 111-c R.C. frame building is modeled and analyzed according to Armenian SNIP II-6.02 code, based on 3 soil categories of Rock (Vs> 800m/s), Dense Soil (500

Seismic upgrading, Additional isolated upper floor, Performance point, Modal pushover analysis, Capacity spectrum