Anchor bolts and Base plate 1

[VillegasST]

Colleagues:

Another question, what is the main difference for anchor bolt and base plate desing between an ordinary and a ductile desing. Due to the different R value that is used, of course seismic forces are different. But is there any special consideration that must be taken?
Thanks!

 

[TLHS]

For an anchorage detail to be ductile, you have to ensure that your governing failure mechanism is ductile via yielding in the anchor bolts rather than, for instance, concrete breakout.

 

[amec2004]

Anchor bolt ductile design --> all concrete related failure modes, breakout, pullout, side blowout, pryout etc, have larger capacities than anchor rod material capacity. In another word, the anchor rod (ductile material) will always fail ahead of concrete's brittle failure.

When SDC>= C, the anchor bolt shall be ductile design or ACI318-08 D.3.3.5 or D.3.3.6 must be satisfied for non-ductile anchor bolt design

The bigger R value you use, the more seismic load reduction you use in the design. This requires the higher ductility in the connection and anchor bolt and base plate are one of these connections

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