The radius requirement tends to be more of a structural / moment capacity requirement and not a geotechnical side shear development question, and therefore a question best left for the owner’s structural engineer. In this way, TIP™ results require owner input as more information is being provided than with previous integrity testing methods.
While designs vary, generic guidelines can be adopted based on the amount of cage movement, reduction in effective radius, or reduction in concrete cover. Some owners specify:
•No more than 1.5 inches (3.81 cm) of cage movement
•No less than 4.5 inches (11,43 cm) of cover (salt water environment)
•No less than 1.5 inches (3.81 cm) of cover (non-corrosive environment)Return to FAQs