Numerical Modelling of Exposed Base Plate Connections and Their Influence on System-level Seismic Response
Bibliographic record
Abstract
Gravity columns with exposed base plate connections are often assumed as pinned in both analysis and design. However, past experiments have shown that base plate connections can provide a significant level of flexural strength and stiffness. This study investigates the influence that the effect of base plate flexural strength and stiffness have on the global seismic response of steel structures. To capture the nonlinear response of exposed base plate connections, a detailed and simplified approaches to model exposed base plate connections are developed. To validate the proposed modelling approach in ABAQUS and OpenSees, it is compared with available experimental data in the literature. The results show that both developed modelling approaches can capture the nonlinear cyclic response of exposed column base connections and that the simplified model is suitable for conducting nonlinear time-history analysis. \nTo investigate the influence of column base fixity on the system-level response of steel structures, the nonlinear dynamic response of a set of prototype single-story steel concentrically braced frames with flexible roof diaphragms was studied. The buildings are designed for a site in Vancouver, British Columbia and considered structures in regions with different hazard levels, soil classes and building dimensions to provide insight into the influence that the level of seismic demand and building geometry has on their response. Finite element models of each prototype structure were developed in OpenSees and were subjected to a series of ground motion records representative of the regional seismicity in Western Canada. Each prototype structure is subjected to the series of earthquakes with three different assumptions for the degree of base fixity: (1) pinned, (2) fixed, and (3) a realistic base plate connection. The results of the study show that the degree of column base fixity does not have a significant influence on the system-level response of the prototype structures, including maximum drift, residual drift, and maximum ductility demand on the bracing. These results suggest that a pinned base connection is a suitable assumption for single-storey steel braced frame structures.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".