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OpenBIM Seismic Analysis•15 min read•Nov 2026

Automated IFC Structural Seismic Story Drift Analysis Architecture

Extracting lateral displacement matrices and computing inter-story drift ratios automatically from structural analysis properties embedded in IFC building models.

Evaluating structural earthquake safety requires checking relative lateral displacements between adjacent building storeys. Automating these computations from semantic IFC data models streamlines structural compliance verification.

1. Parsing Storey Elevation and Displacement Data

Traversing `IfcBuildingStorey` hierarchies and structural load analysis results retrieves nodal displacement vectors across horizontal floor diaphragms.

2. Computing Inter-Story Drift Ratios

Calculating the relative displacement difference between floor $i$ and floor $i-1$ divided by storey height evaluates drift limits against seismic code thresholds.

3. Visualizing Stress and Drift Heatmaps in Web Viewers

Mapping calculated drift ratios into vertex color attributes allows web-based IFC viewers to render instant structural safety heatmaps directly in the browser.