Civil and Environmental Engineering


First Advisor

Jennifer D. Schmidt

Date of this Version



A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Master of Science, Major: Civil Engineering, Under the Supervision of Professor Jennifer D. Schmidt. Lincoln, Nebraska: November 29, 2018.

Copyright (c) Dean L. Whitfield


The objective of this research project was to develop a new, cost-effective, Manual for Assessing Safety Hardware (MASH) Test Level 6 (TL-6) barrier. A literature review on prior Test Level 5 and Test Level 6 barriers was conducted, and the cost of current TL-5 and TL-6 barriers was established. Existing and modified design procedures for roadside barrier were reviewed as well as current TL-6 design forces. A preliminary TL-6 truck model was developed in LS-DYNA. The minimum barrier height to contain a tractor-tank vehicle was determined to be 62 in. for a rigid, vertical-faced barrier through LS-DYNA computer simulation. New barrier design concepts were created, and a combination rail consisting of a lower reinforced concrete parapet and an upper steel rail was chosen as the most feasible configuration. The combination railing was then modeled, and a MASH test no. 6-12 crash test was simulated using the preliminary TL-6 model. The concept was then refined, and the crash test was then simulated again. Conclusions were drawn about the design of the combination rail concept. Recommendations for how to improve the tank-trailer model were presented.

Advisor: Jennifer D. Schmidt