1.The conducted studies in the field of structural damage in past earthquakes 
show that adjacent buildings with partial discontinuity or with a common wall between 
two structures may suffer serious damage during an earthquake and even go to the point 
of collapse [3, 4].Introduction
Today, in cities with high population density, the minimum gap among adjacent structures 
is an important issue due to the fluctuation of buildings during seismic excitations, and 
various codes in this field have specified the minimum distance to prevent buildings from 
colliding [1, 2].