Risk discussed by Wang and Ormsbee <2005> may differ from that of Holzer. Although there are some different definitions of risk among different professions, it is quantified by three termsc probability, hazard (loss or others), and exposure. For example, in health sciences, risk is defined as the probability of gettingcancer if an average daily dose of a hazardous substance (hazard) is taken over a 70-year lifetime (exposure). In the financial world, risk is defined as the probability of losing a certain amount of money (loss) over a period of time. Wang and Ormsbee defined seismic risk as the probability of a structure being damaged one or more times (at least once) in t years (exposure) by an earthquake or ground motion (hazard) generated by the earthquake.This definition is consistent with that of Cornell <1968>. This is also consistent with those used in building codes, such as the International Building Code <ICC, 2000>.