Performance Based Design (PBD) is the modern conceptual approach of seismic structural design which defines target performance objectives that a structure should meet for a number of different hazard levels ranging from earthquakes with a small intensity to more destructive events. PBD procedures have the following distinctive features with respect to traditional prescriptive design requirements: (a) allow the structural engineer to define the appropriate performance of the structure, based on the level of seismic hazard and the corresponding seismic demand and (b) the structure is designed to meet the requirements corresponding to a number of seismic intensity levels. On the other hand, vulnerability analysis is usually performed in order to assess the integrity of existing structures or the designs of new structures obtained by PBD (or the prescriptive) design framework, through estimation of the probabilities that various performance levels will be reached or exceeded given the occurrence of a seismic event corresponding to a specific intensity level. Vulnerability analysis represents an important stage in risk assessment, loss estimation and decision making procedures where it is desirable to achieve a long-term objective in reduction of cost, loss and consequences.
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