Application of the probabilistic SBRA method in the steel frame design

Abstract

This paper is concerned with the alternative reliability assessment of steel frame structures using the probabilistic SBRA method (Simulation-Based Reliability Assessment). The attention is focused on the selection of appropriate reference values, which serve to define the resistance (in case of safety assessment) and appropriate limitations (in case of serviceability assessment) applied in the calculation of the probability of failure Pf of the structure and its members. Next it is necessary to evaluate the suitability of particular transformation models serving as tools for transforming the loading into the response of the structure to the load with regard to the substance of the stochastic method. In this connection attention is paid to the transition from the traditional assessment of buckling strength in compliance with contemporary standards (buckling lengths, buckling factor or stress) to the "strength stability concept" with respect to the effects corresponding to the second order theory. Possible solution based on the probabilistic SBRA method and increasing capacity of computer techniques is outlined and demonstrated using an example of reliability assessment of a multistory frame structure.