MASH Finite Element Analysis and Full-Scale Crash Testing of Stacked W-Beam Transition for 31-inch Guardrail (604581)

Problem Statement No. 2014-LA/77

Final Report: Full-Scale MASH Crash Test of Stacked W-Beam Transition for 31-inch Guardrail

TTI Research Supervisor:
Chiara Silvestri Dobrovolny, Ph.D.
Associate Research Scientist
Texas A&M Transportation Institute
3135 TAMU
College Station, Texas 77843-3135
(979) 845-8971
[email protected]
Pooled Fund Technical Representative:
Kurt Brauner, P.E.
Bridge Engineer Manager
Louisiana Transportation Center
1201 Capitol Road, Suite 605G
Baton Rouge, LA 70802
(225) 379-1933
[email protected]


The objective of this study was to investigate the crashworthiness of a stacked W-beam guardrail transition design for use with a 31-inch guardrail system. The transition’s crashworthiness was evaluated according to MASH criteria. The full-scale crash test was conducted according to MASH Test 3-21. The test employed a 2270P vehicle (pickup truck) impacting the test article at the critical impact point (CIP) at an impact speed of 62 mi/h and 25-degree impact angle.

The stacked W-beam transition contained and redirected the 2270P vehicle. The vehicle did not penetrate, underride, or override the installation. Maximum dynamic deflection during the test was 4.0 inches. As consequence of the impact and interaction with the test article, the roll angle of the 2270P vehicle started increasing to the point that the vehicle rolled 90 degrees onto its right side after loss of contact with the installation. Due to vehicle rollover, the stacked W-beam transition did not meet specifications for MASH Test 3-21.