Over the past years, different building-specific seismic risk assessment tools have been developed. These tools are intended to estimate damage costs and functionality downtime of buildings, which are beyond the life safety requirements of current codes. Although all these programs can be used to measure the performance of different structures, they highly depend on regional economics and construction procedures. In addition, downtime loss estimations are significantly a function of operational efficiency of local contractors and developers (Kahandawa et al., 2018). Therefore, a buildingspecific seismic risk assessment tool for a certain geographic region is inevitable.A building-specific seismic risk assessment platform, called TRUST, is developed for the first time for the country of Iran. This program evaluates the associated risk of structures based on the required repair cost and time for restoring buildings to their pre-earthquake condition. This paper demonstrates the methodology used for the development of
TRUST platform, which is essentially based on the existing performance assessment calculation tool (PACT) (FEMA-P58, 2012). In this software, the risk measures of buildings are calculated by a number of realizations utilizing Monte Carlo simulation to map various sources of uncertainties. The reparability of buildings is examined through the comparison between the simulated demands against collapse and residual drift capacity of buildings. If a building is considered repairable for a certain realization, then the attributes of damage such as repair cost, repair time, casualties and unsafe placarding are calculated (FEMA-P58, 2012). The vulnerability of components is assessed by capacity fragility functions which define the probability of building components that will be damaged under considered earthquakes (Porter et al., 2007). Then, the consequence functions that demonstrate the repair cost and the time of all structural and nonstructural elements are used. Consequence functions of
PACT are based on the socio-economic situation of the USA.
TRUST uses similar functions developed for the country of Iran.