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ExplicitDifferenceStatic: document local damping options and behaviour - #201
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fmckenna merged 4 commits intoOct 9, 2026
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…ples The page described a fixed alpha = 0.59 and only the simple damping law. Document the options `integrator ExplicitDifferenceStatic <-alpha $alpha> <-simple>`, the default combined law acting on the assembled unbalance P - R(u), Tcl and Python availability, and add two verified examples: SDOF free-vibration decay and a pseudo-static hanging chain that relaxes to the static solution. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K524skQQ24A6JCFWNnb7G1
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K524skQQ24A6JCFWNnb7G1
…on-based damping, non-fatal options) Describe the damping in user terms (equivalent to F_d = -alpha |F| sign(v) on the unbalanced force for the lumped mass the scheme uses), note that it works with the parallel diagonal systems and is not disturbed by printB, add -vEps, state that invalid options are warned and ignored, and that the damping history resets on domain changes. Update the ExplicitBathe see-also to its current syntax. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K524skQQ24A6JCFWNnb7G1
…mping Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K524skQQ24A6JCFWNnb7G1
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Branch:
jaabell:fix/explicitdifferencestatic-damping→OpenSees/OpenSeesDocumentation:masterCode PR: OpenSees/OpenSees#1827
Updates the
ExplicitDifferenceStaticpage for the code PR above:integrator ExplicitDifferenceStatic <-alpha $alpha> <-simple> <-vEps $vEps>with a parameter table(defaults 0.59, combined law, 1e-4).
a lumped mass, use with parallel diagonal systems, and the lumped-mass limitation. Invalid options warn and are
ignored. Available from Tcl and Python.
analysis/codeExample/:example_sdof_decay.tcl: decay ratio 0.818161 vs exp(−2α) = 0.818731 for α = 0.1;example_pseudostatic.tcl: converges to the exact static displacements.this page.
Builds with Sphinx with no warnings from the changed files.
🤖 Generated with Claude Code
https://claude.ai/code/session_01K524skQQ24A6JCFWNnb7G1