Inelastic wind design of a steel concentrically braced frame building

An inelastic wind design method for steel frame buildings that allows limited inelasticity under strength-level loads is presented in this paper.In the proposed design method, the main wind force resisting system is designed using reduced strength-level design forces by employing a wind response modification factor that is based on ductility and overstrength.Serviceability requirements are still met using elastic design.The proposed design method is illustrated for a 3-story building with steel concentrically braced frames.Two types of braced frames were designed: a conventional braced frame based on an elastic design and a ductile braced frame based on the proposed inelastic design method.Incremental dynamic analysis results show that the collapse capacity of the inelastically designed braced frames exceed the collapse capacity of the conventional braced frame.Both the conventionally designed and inelastically designed braced frames have a low estimated risk of wind collapse.