Thrie-beam guardrail is a stronger version of the w-beam guardrail systems. The additional corrugation in the rail stiffens the system, making it less prone to damage during low speed and moderate speed impacts. It also allows higher mounting of the rail, which increases its ability to contain larger vehicles under some impact conditions.
Thrie-beam is available in two configurations; using standard blocking pieces or modified blocking pieces. The blocking pieces are used to secure the rail to the specially-engineered supporting posts.
Adjacent rails are bolted together forming a splice connection and end terminals are placed at either end to anchor the system.
Thrie-beam guardrail using either standard blocking pieces or modified blocking pieces is regarded as a semi-rigid barrier. A semi-rigid barrier provides a desirable outcome for both designer and the vehicle occupants. The lateral displacement of the thrie-beam systems, also known as deflection, is typically limited to 0.6m providing protection from nearby roadside hazards. The ability of thrie-beam guardrail to absorb some of the crash energy reduces occupant risk and limits the deformation of the impacting vehicle.
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