Abstract
In this study, the structural design of railing post affecting road landscape was investigated. Bridge beam-type railing post is often made of aluminum-alloy because it has high durability and the extrusion process is possible to produce an arbitrary shape. The optimization of extruded shape was performed by a genetic algorithm using multiple objective functions of mechanical performance and economy. By changing dimensional parameters used in the optimization, the effect of each parameter on the optimization was examined. Based on the optimization results of separated extrusion models, the shape optimized for bulk extrusion models that require the latest developed extrusion machine was also examined.
