Earthquake and corrosion are two factors that threaten reinforced concrete structures in the coastal areas of southern Iran. Taking into account both hazards in designing of structures in these areas, apart from the significant reduction in loss of human lives, can minimize the economic damages. In Iran, the design of newly built buildings is based on seismic hazard maps in the design codes based on a fixed return period of 475 years. Using this traditional approach, results in an unequal risk level. This justifies the risk-targeted design approach and developing risk-targeted hazard maps which leads to a uniform level of risk in the national scale. In this paper, intermediate Reinforced Concrete moment-resisting frames (RC MRFs) under corrosive environment are studied in four important port cities in Iran using risk-targeted approach and in doing so, the design-based peak ground acceleration (PGAs) of these cities is corrected. Based on the results of incremental dynamic analysis (IDA), the risk-targeted PGAs (PGARs) were derived and the correction coefficients for PGAs based on EMME14 (CR-EMME14) and Standard 2800 (CR-St2800) is calculated. The average amount PGARs was between 0.216 g and 0.585 g and the correction factors were from 0.72 to 1.951. The comparison between correction coefficients obtained for the buildings damaged by corrosion, indicate that current PGAs for the studied cities, are not sufficient for the seismic demands. The results also indicate that by increasing the time after corrosion initiation the correction factors for PGAs increase which clearly shows the importance of risk-targeted approach in the seismic design of structures exposed to corrosive environment.