ИСТИНА

Development of earthquake-resistant design techniques begins with the selection of a basic description of seismic ground motion. As dictated by the principles of dimensional analysis, the motion of any mechanical system is determined by three independent dimensions: distance, time, and mass (or force). Therefore, the variables that describe the seismic ground motion must include all of these fundamental dimensions. The concept “oscillation duration” is determined in different ways and can have different physical meanings or even at all not to have any sense.