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To obtain the vertical loading on a slab element which is modeled using a fairly fine mesh, users may implement the following process:
- For each loading patch, or set of patches which act together, select Define > Joint Pattern to define a joint pattern, as shown in Figure 1:
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Figure 1 - Name joint patterns
- Select joints which are contained within the patch or patches. Next, select Assign > Joint Pattern, then assign a dimensionless scale factor D, such as 1.0. This process is shown in Figure 2:
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Figure 2 - Pattern data
- Select the slab elements, then select Assign > Area Loads > Surface Pressure to assign pressure (force/area) such that it acts downward on the top face, according to the appropriate load pattern. This menu is shown in Figure 3:
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Figure 3 - Area surface pressure load
- The pressure on each element will be interpolated from the product between joint-pattern values and the pressure assigned, which is 5.0 kN/m in this example. If only one element joint has a non-zero pressure, a quarter of the load will be applied. Load pressure is multiplied by element tributary area such that users need not manually calculate nodal forces.
