huangyhg

1997 ubc chapter 23 "mode iii or iv" ?
in the 1997 ubc, chapter 23, section 2316.2, table 2.3.2 has two footnotes which address using load duration factor cd greater than 1.33. however, the footnotes refer to "... connections exhibiting mode iii or iv behaviour..." which i cannot find any reference to within the ubc. i believe these are failure modes of some type but need additional info to determine their applicability.
can someone point me in the right direction regarding "mode iii or iv" literature?
thanks
tom hubbell

i found the "definitions" to modes of failure in the fourth edition of the aitc manual.
basically, they are as follows:
mode im - bearing yield of wood from dowels (i.e. bolts, nails, lag screws, etc) bearing on the main member
mode is - bearing yield of wood bearing on the secondary members
mode ii - yielding of the wood due to pivoting of the dowel and crushing near the face of the members.
mode iiim - yielding occurs in the dowel with bending at one plastic hinge point per shear plane (single shear only)
mode iiis - yielding occurs in the dowel with bending at one plastic hinge point per shear plane in secondary
thanks for the very swift reply!
tom
okay, found it.
the various modes are shown and explained in the nds-1997, appendix i, p164.
thanks again for the info.
tom

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