Sign support height analysis using finite element simulation

Finite element (FE) computer simulation has been proven to be an essential tool for evaluating crashworthiness and safety performance of automobiles, roadside hardware appurtenances, as well as several other engineering struc tures. Its use has increased dramatically thanks to remarkable improvements in computer technology and finite element codes. In this study finite elem ent simulation is used to analyse the safety performance of roadside sign s upport systems. Specifically. the study focuses on determining the effect o f sign height on the amount of intrusion into the occupant compartment. The sign support system that is investigated in this study is the 4lb/ft U-pos t. FE models of 5ft (1.5m) and 7ft (2.1m) height signs were created and imp acted with a set of vehicle models at different impact speeds. Five vehicle models were employed in the study: Chevrolet C2500 pickup, Geo Metro, Ford Taurus, Plymouth Neon, and Dodge Caravan. Three impact speeds were analyse d: 20, 40, and 60mph (32, 64, and 96km/h). A total of 18 simulations were p erformed and the results were compared to evaluate intrusion of the signs i nto the occupant compartment. The simulation results were verified by condu cting a full-scale test of the worst-case scenario, a Geo Metro into the U- post at 60 mph.