Steel Plate Shear Walls in the Upcoming 2010 AISC Seismic Provisions and 2009 Canadian Standard S16
Bibliographic record
Abstract
Steel plate shear walls were introduced into US codes as "Special Plate Shear Walls" (SPSW) in the 2005 edition of the AISC Seismic Provisions for Structural Steel Buildings, also referred to as AISC 341; the provisions were derived from those in Canadian Standards Association (CSA) standard CAN/CSA-S16-01. Limit States Design of Steel Structures Steel plate shear wall provisions originally appeared in the 1994 edition of Canadian standard S16 as a non-mandatory appendix. Since this introduction, the system's use in the US and elsewhere, as well as design studies, has led to a refinement of several aspects of the design requirements, which are being considered for the 2010 AISC editions. Simultaneously, AISC 341 is being revised to clarify the desired behavior and basis of design for each system. These developments have resulted in the following changes for SPSW: explicit definition of the capacity-design mechanism; identification of expected regions of inelastic strain; simplification of the calculation of web-tension angle; clarification of strong-column/weak-beam design procedures; and inclusion of methodologies for perforated web plates and walls with reinforced corner cut-outs. Additionally, changes to AISC 341 that would permit design of columns considering expected forces below those corresponding to the sum of all member capacities are being considered. This paper presents some of the anticipated changes to the SPSW provisions in the context of the broader changes to AISC 341. Since their original introduction into CSA standard S16, steel plate shear wall design provisions have evolved as new research into their behavior has become available and field experience has been gained. In the upcoming 2009 edition of the standard, changes to the provisions are expected to be largely consistent with those being considered for incorporation into the new AISC seismic provisions, including such issues as improved capacity design guidance and the introduction of a means of design for steel plate shear walls with perforated infill plates. Some of the anticipated changes to S16 are also discussed below.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.008 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.004 | 0.003 |
| Scholarly communication | 0.004 | 0.002 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.003 | 0.004 |
| Insufficient payload (model declined to judge) | 0.022 | 0.012 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".