Bracket and Sacrificial Pin Sign Support on CMB

Report Number(s): 0-6646-1, 466462-2a

Description: The design used for test 466462-2a consisted of the same sign assembly and post details used in test 466462-1. However, the sign post is mounted to the barrier by attaching it to two trapezoidal side plates. The ¾-inch thick plates hold the post via a ¾-inch diameter bolt and a 5/16-inch diameter sacrificial bolt. Both bolts are designed to keep the sign up under wind loading. However, the sacrificial bolt would break upon excessive longitudinal forces on the post due to impact. Hence, this the sign assembly would pivot around the ¾-inch hinge bolt under excessive impact force. The bolts are secured to the side plates/base pivot assembly. The plates are welded to a 20-inch × 6-inch × ½-inch thick plate. This mounting assembly is attached to the top face of the barrier via two anchor rods; each is 8 inches long, ¾-inch diameter.

Test Level: 3

MASH Test Number: 3-11

Proprietary/Non-proprietary: Non-proprietary

Pass/Fail: Pass

Evaluation: Testing + Engineering Analysis

Sponsor: TxDOT & FHWA