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Anchoring cap on existing abutment

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Ddebnath

Structural
Apr 27, 2003
1
Hi
I am working on a bridge where the superstructure is pony truss with corrugated metal deck. I am using the existing abutment which is in very good shape. The existing abut. will be cut like 2-3 ft and anchored with a new abutment cap and grouted. How do I calculate the number and spacing of anchored bars and the anchored depth? Any idea where can I find the design guidelines?
Thank you in advance.
 
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The forces you need to pass to the abutment drive the details of the connection. If giving your reliance upon the sliding devices in place the shearing forces are scarce (at least there will be one end where braking must be taken, wind, earthquake in both, at least in one direction, presumably, shrinkage as well maybe to some extent etc) you then will resource to constructive detailing. But first, all needs by analyzed and designed for the forces there.

If you want to ensure some better connection between the old and the new, you may elect to preserve the main rebar if any in the abutment; this will ensure more perfect connection for not too deep drilled connectors. I would say that placing drilled connectors under 10 inches separation is no good practice where there is not such need. Contrarily, 20 inches look to me too much separation. This in each row. Separation between the rows I would admit bigger.

Respect the depth of the connection there technical procedures of calculation in the codes, UBC had such. The providers of drilled fasteners also make readily available procedures for their proprietary systems. In general if you go by any of these providers you will be talking normally of short anchors, say 6 to 16 inches. You may elect procedures more of RC and then epoxy glue far deeper rebar. Using rods like anchoring base plates for steel columns is also of such depths and a feasible but less likely election.
 
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