Aesthetic Concrete Barrier Design

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Therefore, the Oregon bridge rail crash test was not taken into consideration when selecting the failure limit. The outcome of impacts with solid barriers in which the internal energy of the floorboard is between 2,200 N-m and 10,700 N-m is largely unknown due to lack of crash test data with a sufficient range of OCD values. As is described in Chapters 6 and 7, the full-scale crash tests were designed to adjust these energy thresholds and reduce the size of the region with unknown performance. GENERALIZED SURFACE ASPERITY DEFINITION In order to model asperities on the barrier surface for evaluation in the parametric simulation effort, it was necessary to adequately define their geometry.

This is because even though d is large, the small width of the asperity reduces the potential for vehicle parts to intrude into the asperity. Thus, the opportunity for vehicle Parametric study results for a 30-degree angle of asperity Asperity Width (W) Run Vehicle [mm] 1 100 Truck 2 100 Truck 3 Truck 200 200 4 Truck Truck 5 200 6 400 Truck Truck 7 400 400 Truck 8 400 Truck 9 10 600 Truck 11 600 Truck 12 600 Truck 600 Truck 13 600 14 Truck Passing Limit = 2,200 J Failure Limit = 10,700 J Asperity Depth (d) [mm] 0 25 0 25 50 0 25 50 75 0 25 50 75 100 Truck Floorboard Internal Energy [J] 1,108 4,476 1,108 6,238 7,652 1,108 4,465 7,538 11,341 1,108 3,952 4,701 5,985 6,724 Pass/Fail Pass Marginal Pass Marginal Marginal Pass Marginal Marginal Fail Pass Marginal Marginal Marginal Marginal 51 Figure 59.

LS-DYNA has been used extensively in simulations involving vehicular impacts with roadside safety appurtenances, including safety shape barriers. The decision to choose this explicit finite element code for this research was based on several reasons, including: • The availability of vehicle models that correspond to NCHRP Report 350 design test vehicles (mainly the 820C and 2000P vehicles). These vehicle models have been used for roadside safety applications for the last 6 or more years, and their fidelity and limitations are reasonably understood.

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