# Pier Stem Deconstruction \[SIG] The Pier Stem Deconstruction workflow item removes one or more previously constructed pier stems (stem walls) from the structural model at a selected construction stage. From the selected stage onward, the stiffness contribution of the listed pier stems is deactivated so that staged construction and load cases reflect the demolished state of the substructure. ## Pier Stem Deconstruction **Stage:** Choose the Construction Stage at which the pier stems will be deconstructed. The stem-wall FE group is deactivated starting at this stage. **Pier Stems:** Pick one or more pier stems (stem walls) to deconstruct at the selected stage. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.openbrim.org/templates/steel-i-girder-bridge-workflow/construction-sig/substructure-deconstruction-sig/pier-stem-deconstruction-sig.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.