Load and resistance factor design of cold-formed steel revised tentative recommendations - load and resistance factor design criteria for cold-formed steel structural members with commentary

The Allowable Stress Design Method has long been used for the design of cold-formed steel structural members. The Load and Resistance Factor Design Method has recently been developed from a research project sponsored by American Iron and Steel Institute. In this method, separate load and resistance factors are applied to specified loads and nominal resistance to ensure that the probability of reaching a limit state is acceptably small. These factors reflect. the uncertainties of analysis, design, loading, material properties and fabrication. They are derived on the basis of the first order probabilistic methodology as used for the development of the LRFD recommendations for hot-rolled steel shapes for buildings. This document contains six sections of the LRFD recommendations for cold-formed steel structural members and connections. The background information for the design criteria is discussed in the Commentary and other related references