Performance & Resilience Design

For each structure, there is a continuous curve indicating the magnitude of earthquakes that may occur over the useful life of the structure. This curve begins with small earthquakes with a high probability of occurrence and low damage to the useful life of the structure and ends with very large earthquakes with a very low probability of occurrence and severe damage to the useful life of the structure. In Performance Based Seismic Design, the goal is to have a structure with the desired performance under all points on the curve, each representing an earthquake of a certain magnitude and probability.

As we know in the seismic design of structures, our goal is never to prevent any damage to the worst possible earthquake. This is neither necessary nor economically rational. Given this fact, the main purpose in seismic design is to limit the damage to a building under different earthquakes to an acceptable level.

The primary purpose of current codes is to protect lives under severe earthquakes and implicitly control hazardous conditions. This goal is a minimum goal that is required for ordinary structures. Based on the performance base design philosophy of acceptable failure limits, it is defined by considering the economic impacts of structural failure. In other words, the costs of constructing, maintaining, and repairing the damages caused by possible earthquakes over the useful life of the structure ultimately determine the type of design and the extent of the damage acceptable. Thus, the extent of damage to structures will cover a wide range from "no damage" to "collapse".

Today, resilience-based design has been defined and evaluated on a variety of topics such as risk management, crisis management, social security, economics, and in general, any system of society where sudden and unexpected disruption is possible. Resilience to infrastructure performance against natural disasters is mainly concerned with the ability to resist and recover quickly from all types of structures, infrastructure and critical arteries in the face of devastating events. This topic, which is one of the latest engineering sustainable development approaches, will assess seismic damage in addition to seismic risk assessment and examine how post-earthquake engineering systems are recovered. A resilience assessment approach will also include a simulation of how to manage the crisis, return and repair of the building and its facilities after the earthquake.