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Slab on Risers

Model Details and Parameters

The purpose of this test case is to validate the plate/shell element solver in SkyCiv Structural 3D (S3D). The results were compared against a third-party analysis software. In this test case the following model parameters were used:

  • Analysis Type: Linear Static
  • Beam Material: Structural Steel
  • Beam Young’s Modulus: 200,000 MPa
  • Beam Poisson’s Ratio: 0.27
  • Slab Material: Concrete
  • Slab Young’s Modulus: 17,000 MPa
  • Slab Poisson’s Ratio: 0.20
  • Plate Type: Mindlin Plane Stress
  • Plate Size: 5m x 5m (offset 300mm to sit on top of the beams)
  • Plate Thickness: 300 mm
  • Corners Supports: FFFRRR (3D Pin) on the four corners
  • Pressure Load: 10 kPa normal to plate
  • Members: 5m Length, 300mm x 300mm x 20mm

slab-model

Results – 10×10 Structured Mesh

Result Location SkyCiv Third-Party 1 Difference 1 Third-Party 2 Difference 2
Max Member Displacement Y (mm) Node 69 -0.26661 -0.26625 0.14% -0.26660 0.00%
Max Plate Displacement Y (mm) Node 58 -0.93134 -0.92789 0.37% -0.93132 0.00%
Max Von Mises Stress – Element (MPa) Meshed Element 1 Top – Underside of Slab 1.13369 1.12261 0.99% 1.13930 -0.49%
Max Shear Stress, Tresca – Element (MPa) Meshed Element 1 Top – Underside of Slab 0.62417 0.61864 0.89% 0.62760 -0.55%
Reaction Y (kN) Node 1 62.50000 62.50000 0.00% 62.50000 0.00%
Reaction X (kN) Node 1 114.15130 115.52470 -1.19% 114.15270 0.00%
Member Moment Z (kN-m) Node 1 -8.97004 -8.46763 5.93% -8.97015 0.00%

Extra Considerations

  • This verification model was created and checked on 28 February 2020. Since this date, the plate solver and S3D software may have been further improved to achieved greater accuracy.
  • Plates are not exact elements like beam and frame elements and therefore the mesh plays a huge role in the results. Always try to use a structured mesh when it is possible to do so.
  • Results between software will never be exactly the same since different elements are used and the nature of plates are approximate
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