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building structure's ability to sustain its due functions, such as safety and serviceability, at and after a particular earthquake. A structure is, normally, considered safe if it does not endanger the lives and wellbeing of those in or around it by partially or completely collapsing. A structure may be considered serviceable if it is able to fulfill its operational functions for which it was designed.
Nowadays, the people's attitude has changed dramatically though seismic loads, sometimes, exceed ability of a structure to resist them without being broken, partially or completely.