Collapse probability and resistance factor calibration of 2D steel frames under gravity loads

The current advanced analysis techniques for steel frames generally use structural analyses with geometric and material nonlinearities to capture the collapse strength of frame. Unfortunately, true a frame cannot be predicted accuracy because uncertainties most significant design variables. Building codes structures apply resistance factor account present in variables thus ensure target level reliability. This article examines reliability planar subject gravitational loads by (second-order inelastic analysis). To calculate probability frames, we utilized first-order method (FORM). were performed using program MASTAN2 considered inelasticity steel. probabilities evaluated adequacy applied was discussed. procedure ANSI 360 reduces yield stiffness all members 0.90. Thus, study suggests that adopted must equal 0.85 index 3.0, or it 0.69 3.8.