KATAI 2D

Fatih Küçükkarakurt

doi:10.5281/zenodo.20692282

Desktop application · in development

The same verified engine, with a drawing board on top.

The open-source release of KATAI 2D is a command line and a Python package. On top of the same engine, a desktop application is being built for the engineer who would rather draw a section than script it: geometry, structures, mesh, construction stages, results and reports in one window. It is a separate track and not part of the open-source release. Everything below is a real capture from the development build — nothing is a mock-up.

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KATAI 2D desktop application showing a slope stability result: factor of safety 1.384 by phi-c reduction on the Griffiths and Lane Example 1 slope, total displacement contours from 0 to 0.2138 metres marking a curved slip surface on a mesh of 670 elements, with phases panel on the left and results panel on the right. — **Factor of safety 1.384.** The Griffiths & Lane (1999) Example 1 slope; the Bishop & Morgenstern chart value is 1.380. The contours are the displacement field at failure — the slip mechanism, found rather than assumed.

Five modes, in the order of the work

The window follows the sequence of an analysis, left to right: Soil, Structures, Mesh, Flow conditions, Staged construction — and one Calculate button. Each tab carries the standing of its step, so you can see at a glance whether the mesh is older than the geometry or the results are older than the model.

Draw with the mouse on a snapping grid, or type coordinates into a command line: poly, rect, plate, absolute, relative and polar points.
Import geometry from DXF.
Material sets for all seven constitutive models, with drainage type and permeability.
Light and dark themes; reports in English and Turkish.

A tied-back excavation, start to finish

Structures, mesh, seven construction phases, results.

KATAI 2D structures mode: an excavation in silt over sand over loam, supported by two retaining walls with interfaces and four inclined anchors, with a surcharge beside the pit, the groundwater level, a model tree and a toolbar of structural element tools. — **Structures.** Two walls with interfaces on both faces, two anchor levels a side, a surcharge and the water level, over silt, sand and loam.

KATAI 2D mesh mode: the same excavation meshed with 4371 six-node triangles and 8964 nodes, refined around the walls and anchors, with element size, element type, automatic refinement and mesh quality statistics in the side panel. — **Mesh.** One click: 4371 six-node elements, refined near structures and loads. Minimum angle 21.0°, mean quality 0.90, both reported.

KATAI 2D staged construction mode with results: seven phases from wall installation through excavation, anchor prestressing and dewatering, all marked calculated; vertical displacement contours showing heave of the pit floor of 22.5 millimetres and settlement behind the walls; a list of anchors and walls whose force diagrams can be displayed. — **Results.** Wall and load, dig to 27, top anchors at 500 kN, dig to 23, bottom anchors at 1000 kN, dig to 20 with dewatering. Pit-floor heave 22.5 mm; force diagrams for every anchor and wall.

KATAI 2D mesh mode showing the Griffiths and Lane slope meshed with triangular finite elements, with mesh statistics in the side panel. — **Every model the same way.** The slope of the first screenshot, at the meshing step.

When a model fails, it tells you what that means

A load that the ground cannot carry is not an error message to be dismissed. In the capture on the right a strip footing has been loaded past its bearing capacity. The phase is marked failed, and the panel explains: 86% of the applied load was equilibrated before a collapse mechanism formed; the stiffness parameter fell to 0.00073; that equilibrated fraction is the limit load; and because an earlier increment ran out of iterations, the figure may be an underestimate.

It then says what to do about it — increase strength, widen or embed the footing, reduce the load, or run a Safety phase. The same information is in the engine’s results file and in the Python API; the desktop application only makes it hard to overlook.

KATAI 2D after a strip footing on weightless Tresca clay was loaded to collapse: the load phase is marked failed and a message states that 86 percent of the applied load was equilibrated, the stiffness parameter fell to 0.00073, the body has softened into a mechanism, and the equilibrated fraction is the incremental limit load. — **Collapse, diagnosed.** The Prandtl benchmark taken past failure: what was reached, why it stopped, and how to read the number.

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