Buildings: [5.8.4 EN 1998-1]
Bridges : [6.4.2. EN 1998-2]
To these paragraphs in certain areas (i. below pilecup and at soil strata changes with stiffness module ratio more than 6) you should design as potential plastic hinge regions. That means that in buildings you should apply (DCM) the paragraph [5.4.3.2.2 EN 1998-1] that requires minimum longitudinal reinforcement 1% and maximum 4%. Also design for critical regions (i.e. stirrups distances, volumetric ratio etc).