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What are the functions of anti-bursting reinforcement?

Through stress transfer along lean edge of P/T slab, compressive stress is transmitted from anchorage zone to slab in the interior. Nevertheless, there also unfavorable transverse tensile stress occurs which might cause slab to blow out from inside out unless enough amount of anti-burst reinforcement is provided.

This blow out occurs particularly at top or bottom of slab where confinement is barely provided.

Furthermore, at local stressed zone nearby anchorage device, extremely high stress concentration can occur at the magnitude superior than unconfined compressive strength of concrete itself.

Two general forms of anti-burst rebars are ties (stirrups) and helical wire type. Huge benefit of helical wires over conventional ties has been observed in its ductility improvement to concrete at local zone due to well-organized confinement.

It is very straightforward to install as compared with conventional tie outline.