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"ductile failure" of anchor bolts

"ductile failure" of anchor bolts

"ductile failure" of anchor bolts

(OP)
I am designing a base plate of a special concentrically based frame.  I understand that it is preferable to maintain a ductile failure mode.  Does this just mean that the strength of the concrete embedment needs to be greater that the steel strength of the anchor bolts?  Currently, I have 1 3/8" A36 anchor bolts with 30" embed.  The design tensile strength of 4 bolts is 257k.  The design breakout strength of the 4 bolt group is 279k.  The amplified seismic uplift is 176k.  So 279k is greater than 257k and the design is "ductile."  Is this correct?  Do I need to maintain a certain factor of safety for ductility? Thanks.

RE: "ductile failure" of anchor bolts

No, you got it correct.  The steel will yield prior to concrete breakout.

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