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Ductility In Appendix D ACI 318

Ductility In Appendix D ACI 318

Ductility In Appendix D ACI 318

(OP)
I need help with ACI 318 Appendix D. I am designing a non-building structure in SDC C. I used ASCE7 chapter 15, R= 1.5. The structure is a concentrically braced frame.

In D.3.3.4 the ACI 318 code specifies, "In regions of moderate or high seismic risk ... anchors shall be designed to be governed by tensile or shear strength of a ductile steel element." What does this mean? Does the controlling failure mode need to be bolt tension or bolt shear? Non-building structures are allowed to be designed for an R = 1.5 without the use AISC341 even for structures in SDC C,D,E,F. It seems to me the same logic could be applied to concrete structures.

RE: Ductility In Appendix D ACI 318

Which code are you in, 08, 11, 14? ACI 318-11 D.3.3.4.3, has the requirements for anchors that fail ductile. As you state the basic requirement is that the concrete failure modes do not control. ACI 318-11 D.3.3.5.3 governs for shear.

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