The net pressure exerted by the soil on the wall varies during the earthquake. However, the net pressure has a upper limit that cannot be exceeded, which corresponds to the condition of limit equilibrium. To check if this condition is always satisfied during the calculation, DReW Seismic plots the evolution with time of the net stress calculated at the base of the wall and compares it to the value corresponding to the limit equilibrium condition. The method developed by Conte, Troncone and Vena (2017) is used to this purpose. An example is shown in the following.
Comparison between the net pressure calculated at base of the wall and the maximum threshold corresponding to the limit equilibrium condition
After the calculation, the user should verify that the net pressure calculated at the wall base never exceeds the limit value.