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F-shape Bolt Through Tie-Down Anchor Size

Question
State	WI
Description Text	Can we reduce the size of the bolt through tie-down anchor from its current 1.125" diameter size if we increase the grade of the anchor?

System Performance Evaluation

System Types
Portable Barriers

Applications

System Features

Date January 18, 2007
Previous Views (19) Favorites (0)

Response
Response (active)	The short answer is yes. Ron and I calculated the shear, tensile, and bending capacities of the 1.125" diameter A307 anchor we used to test the system. We then compared those capacities with a 1" diameter Grade 5 (A325) rod. The 1" diameter Grade 5 rod possesses sufficient capacity and ductility to be substituted for the larger anchor if desired. So as long as the anchor grade is increased to a Grade 5 equivalent, the diameter can be reduced to 1" We would suggest that you approach FHWA for approval on the use of the smaller anchor in order to alleviate any potential liability issues raised by switching to an anchor other than what was full-scale tested.

Response

Response
(active)

The short answer is yes. Ron and I calculated the shear, tensile, and bending capacities of the 1.125" diameter A307 anchor we used to test the system. We then compared those capacities with a 1" diameter Grade 5 (A325) rod. The 1" diameter Grade 5 rod possesses sufficient capacity and ductility to be substituted for the larger anchor if desired. So as long as the anchor grade is increased to a Grade 5 equivalent, the diameter can be reduced to 1"

We would suggest that you approach FHWA for approval on the use of the smaller anchor in order to alleviate any potential liability issues raised by switching to an anchor other than what was full-scale tested.

Date January 18, 2007
Previous Views (19) Favorites (0)

Attachment Anchor Bolt Capacity V2.xls