Physical Model of Shallow Foundation under Dynamic Loads on Sands

Structures built on sands worldwide, with shallow foundations, have experienced damage and collapse during after earthquakes. Two phenomena triggered the collapse: liquefaction phenomenon P-Δ effects. However, current research practice do not fully understand granular soil behavior effects, as proven by sum of investigations physical models, constitutive laboratory testing proposals about these topics. A question appears at this point: what is relationship between excitation frequency, displacement amplitude, triggering overturning? To cope issue, authors propose to create a 1-g model composed single-degree-of-freedom oscillator (SDOFO) capable transmitting cyclic loadings in rocking vibration mode. The measurement methodology was based computer vision using OpenCV Python, which allowed “free movement” SDOFO. use suitable way obtain displacements times without sensors placed directly model. According results, it possible define an inversely non-linear total cycles required reach overturning for different effective grain-size (D10).