Continued development of a non-proprietary, high-tension, cable end terminal system.
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2016-04-29
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Edition:Final report
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Abstract:A non-proprietary, cable guardrail system is currently under development for the Midwest States Pooled Fund Program.
A cable guardrail end terminal was necessary to accompany the cable guardrail system. The objective of this research
project was to develop design recommendations for the cable end terminal. Bogie testing that was previously completed on
a design concept indicated delayed cable release, which was an undesired performance that led to vehicle instabilities.
Several design changes were recommended for better end terminal performance and to reflect the changes made to the cable
median barrier.
An LS-DYNA model of the modified cable end terminal was developed. Simulations of 0- and 15-degree impacts on the
end of the cable anchor bracket with a bogie model indicated that the cables would release easily and not induce vehicle
instabilities. This behavior still needs to be verified through bogie and full-scale crash testing. Simulations of a 25-degree
reverse impact between post nos. 2 and 3 with small car models indicated that cables did not release easily and may
interlock around the car resulting in excessive vehicle decelerations or instabilities.
Simulations of various line post designs found that the MWP and weakened MWP have lower forces and energies during
impact than the S3x5.7 posts used in previous three-cable end terminals. This finding would suggest improved performance
with respect to vehicle override and instability. However, vehicle simulations with multiple line posts impacted were
inconclusive. Further design modifications, evaluation, and testing are recommended.
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