RAM | STAAD Forum - Differentiating Between Base Plate and Anchor Design according to Seismic Provisions
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Question

Differentiating Between Base Plate and Anchor Design according to Seismic Provisions

by
Josh Burns
Explorer

I have created a RAM Structural System model and gone through RAM Frame and am now looking at the base plate designs in RAM Connection. The project has a Seismic Design Category C and uses "Steel Systems Not Specifically Detailed for Seismic Resistance" as the lateral system. When designing the base plate connections for the seismic over-strength factor, my understanding is that only provisions of ACI 318, Chapter 17 are required and not the AISC Seismic Provisions. This would mean only my anchors are designed for the seismic over-strength factor, and my base plate design will not incorporate the seismic over-strength factor. This is also according to AISC Design Guide #1, Third Edition, which makes clear in Chapter 6 that only anchorage needs to be designed for over-strength in this case. However, RAM Connection doesn't seem to differentiate between the base plate and anchor designs and is attempting to design the base plate for over-strength as well.

Is there a work-around for this? Would I just design the anchors according to the over-strength factor and then un-check the Seismic Load Cases before designing the base plate?