Crash Impact Modelling Of Security Bollard

This paper presents the findings from vehicular crash test of a security bollard system, as well as findings generated from numerical simulations using two different loading approaches in LS-Dyna®. The differences between the results from numerical simulations and test observations are explored by examining the velocity-time history profiles of the vehicle and the rotational response of the bollard. The first approach involved a NCAC Chevrolet C2500 finite element pickup model impacting against the bollard model. Contact algorithm was defined to represent the contact of an impacting pickup with the bollard at the collision. In the second approach, the vehicle impact was instead represented by a force pulse generated from the actual crash testing. This approach greatly reduced the computational time required and the results showed good agreement with the vehicle model simulation applied in the earlier approach. These models can be useful tools for design work and provide alternative means to assess the performance of the security bollard system.