Prediction Model for beam-upright connection in Ultra-high-rise cold-formed steel storage rack structures

Ultra-high steel storage racks are becoming more common to accommodate Automatic Storage and Retrieval System (ASRS). This type of structure employs partially restrained connections at the beam-to-column joints. Accurate structural analysis of this type of structure requires a realistic structural model for the beam-to-column joint. This research presents beam-to-column joints model for the design of high-rise cold-formed steel storage racks. This study consisted of analyzing beam-to-column joint tests from past studies and developing a moment-rotation joint model based on an appropriate mathematical function and statistical analysis. When compared with experimental investigation research and new experiment, it was found that the moment-rotation response from model could predict the beamcolumn joint behavior with acceptable accuracy. Therefore, it can be concluded that proposed model could be used in the design process and performance evaluation of the steel storage racks