Mohammad Reza GHAYAMGHAMIAN - Professor, IIEES, Tehran, Iran
Fatemeh BOZORGI - Ph.D. Student, IIEES, Tehran, Iran

One of the main challenges of this century for high-seismic cities is to prepare for natural disasters, especially earthquakes to reduce the vulnerability and increase seismic resilience. Seismic resilience indicates the ability to maintain a level of functionality or performance of a building, bridge, lifeline network, or community over a specified period of time determined as a TLC or control time (Figure 1). Resilience is defined geometrically as a normalized shaded area below the functional diagram of the system, determined as Q(t). Q(t) is an invariant stochastic process that is measured as a percentage in terms of the dimensionless function of time.In the case of multiple events, each event is expressed as a continuous piece of independent function (Figure 2).Mathematically, the resilience of several events can express with Equation (1).

Seismic resilience, Risk reduction, Hospitals and healthcare centers, Prioritization of retrofit and rehabilitation, Cost-benefit function