Worldwide, the road safety barriers containment capacity is evaluated by full scale crash tests which are performed according to specific crash conditions. In the most common benefit-cost analysis aimed at evaluating roadside safety alternatives and in the most common road safety barriers selection procedures, the barrier’s performance limit is assumed as the maximum Impact Severity of the crash tests successfully performed, that is the vehicle’s kinetic energy evaluated by the lateral component of velocity. In this paper the effectiveness of IS has been assessed. At this aim a great number of collisions of an Heavy Goods Vehicle against a steel road safety barrier were simulated through a non-linear dynamic finite element analysis, each one characterized by the same value of kinetic transverse energy and different values of the parameters that define IS: vehicle’s speed, mass and impact angle. The results obtained show that the collision outcomes noticeably change with these parameters: the smaller the impact angle and mass the greater the barrier’s displacements and vehicle’s rollover risk. Due to this influence the Limit Impact Severity of safety barriers considerably changes with the impact conditions. To address this problem, at least for the barrier and the vehicle considered in the study, an analysis aimed at evaluating the relationships between Limit Impact Severity and vehicle’s impact angle and mass has been carried out. The expressions obtained allow to evaluate the vehicle’s containment taking into account both the IS value and the values of vehicle’s mass and impact angle.

HGV Collisions Against Road Safety Barriers in Relation to the Parameters which Define Impact Severity

MONTELLA, ALFONSO;PERNETTI, MARIANO
2000

Abstract

Worldwide, the road safety barriers containment capacity is evaluated by full scale crash tests which are performed according to specific crash conditions. In the most common benefit-cost analysis aimed at evaluating roadside safety alternatives and in the most common road safety barriers selection procedures, the barrier’s performance limit is assumed as the maximum Impact Severity of the crash tests successfully performed, that is the vehicle’s kinetic energy evaluated by the lateral component of velocity. In this paper the effectiveness of IS has been assessed. At this aim a great number of collisions of an Heavy Goods Vehicle against a steel road safety barrier were simulated through a non-linear dynamic finite element analysis, each one characterized by the same value of kinetic transverse energy and different values of the parameters that define IS: vehicle’s speed, mass and impact angle. The results obtained show that the collision outcomes noticeably change with these parameters: the smaller the impact angle and mass the greater the barrier’s displacements and vehicle’s rollover risk. Due to this influence the Limit Impact Severity of safety barriers considerably changes with the impact conditions. To address this problem, at least for the barrier and the vehicle considered in the study, an analysis aimed at evaluating the relationships between Limit Impact Severity and vehicle’s impact angle and mass has been carried out. The expressions obtained allow to evaluate the vehicle’s containment taking into account both the IS value and the values of vehicle’s mass and impact angle.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/187754
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