Risk analysis for code calibration

A procedure has been developed to calibrate safe O' indices for various types of structures. The load model is based on normal approximations of non-normal distributions at the design point. For time varying loads, the basic time intervals are considered, with probabilities of occurrence in each interval and conditional distributions of intensity. Load and resistance factor format and allowable stress design are considered. Computations were carried out for the National Building Code of Canada. Safety indices are presented in charts and tables. The results can be used to determine optimum values of resistance factors and/or safety factors.