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Material yielding at member ends (Arclm101)

The optional YIELDEND entry in a SECT block selects material yielding in the element's ENOD order. 1 enables yielding and 0 keeps the end elastic:

         YIELDEND 1 0

Add this line to SECT 221 to use its existing NZMAX through MYMIN, EXP and EXQ at the first end only. The second end develops no plastic deformation and is not limited by those capacities. Its forces still change through member equilibrium and redistribution when the first end yields. The elastic stiffness and input connection springs/releases are retained.

Omitting the entry, or specifying YIELDEND 1 1, retains the previous behavior. YIELDEND 0 1 enables only the second end; YIELDEND 0 0 keeps both ends elastic. This setting applies to every member using that section. Check the order of the two node numbers in each member's ENOD entry; it is not inferred from height or coordinates. Different capacities or exponents at the two ends are not introduced by this option.

Rebuild the application, reload the .inp, extract the analysis frames again, and start Arclm101 with -init after changing this material setting. Do not continue an analysis with material history calculated under the old setting. The setting survives .inp and arclm section exports and section snapshots. It also applies to time-history analysis, which shares the material return solver. Older application versions do not implement YIELDEND.