Abstract

Design for safety includes not only the vehicle and occupant protection system but also the structures that vehicles hit. One such example includes temporary concrete barriers. Often in work zones on bridges there is very little room available for barrier deflections when impacted by errant vehicles. Thus, deflections of the barriers must be severely restricted to prevent the barrier from being deflected off of the deck, followed closely by the striking vehicle.

A tie-down design was generated consisting of a steel base plate with two vertical steel tubes, each with a crosshead tube blockout. Nonlinear finite element analysis of the new design focused on gauging the performance of the design as well as optimizing the structural requirements and anchor loads. Results of simulating a full-scale crash test predicted that the proposed design would be capable of safely constraining the barriers during an impact event.

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