There are many human injuries induced by occupational accidents in construction industries. Determination and analysis of construction accidents' contributing factors is a good way to accidents' prevention and reduction. Therefore, this study was done in view of identification and analyzing factors related to frequency and severity of construction accidents and injuries in the big construction industries. This analytical-cross sectional study was implemented on 500 occupational accidents during five years in the Iraninan big construction sites. Data gathering was done based on accident report form and information were related to all the reviewed construction accidents. Data analysis was carried out using statistical tests such as linear regression, independent sample T-test and One-way ANOVA, including statistical software of SPSS v22.0. The results revealed average values of accidents indices including accident frequency rate (AFR) and accident severity rate (AFR and ASR) respectively were 4.71 and 216.28. The findings showed that almost all factors including demographics, organization, accident type, work conditions and equipment, unsafe acts, unsafe conditions, nature of accidents, Health, safety and environment (HSE) training and control measures, and finally accident time and place were significantly related to the AFR and ASR (p<0.05). Conclusively, the results indicated that the frequency and severity of occupational accidents in construction industries were due to failures in combination of different contributing factors. Therefore, to promote HSE in the construction fields and reduce frequency and severity of the construction accidents, all these factors were considered.
Key words: Occupational accidents, human injury, construction industry, accident analysis, contributing factors.
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