شكل البلاطة والأحمال

يمكن اعتبار أساسات بأي شكل وتحتوي على الفتحات، ‏شكل 36 . يمكن أيضا اعتبار أساسات ذات سمك متغير ‏شكل 37 . يمكن إدخال أنواع مختلفة من الأحمال سواء كانت أحمال مركزة أو عزوم أو أحمال خطيه أو عزوم خطية أو أحمال موزعة عند أي موقع على البلاطة دون الارتباط بالشبكة، ‏شكل 38 .

FE-Net

Different element types are developed to generate the FE-Net of the slab according to the Grid-based approach for both triangular and rectangular elements and according to Delaunay’s triangular generation for triangular elements. A new FE-Net is created. When choosing the File - New command and the following templates for different types of FE-Net appear (Figure 39). Using these templates, FE-Net can be generated according to the following features:
  • Generating the FE-Net for square, rectangular and irregular slabs using 6 different types of nets, Figure 40.
  • Generating the FE-Net for circular and ring slabs using 15 different types of nets, Figure 41.
  • Generating an irregular slab with openings and arc boundaries using a refined mesh, Figure 42.
  • It is possible to use combined rectangular, quadratic and triangular finite elements at the same time for the slab, Figure 43.
  • It is possible to create slab corners, opening corners, and reference corners graphically using CAD-style, which lets the definition of the net quick and easy, Figure 44.
  • In ELPLA, there are two alternative methods to define slab corners, opening, and references either by Mouse or by editing in a table, Figure 45.
  • It is possible to optimize the dimension of FE-Net by making all elements have nearly the same area as possible as by the option "Smoothing the mesh", Figure 46.
  • It is possible to direct and arrange all elements on the slab borders (Figure 47). This option is useful to present contact pressures at raft edges in a good manner when analyzing the raft by Continuum model, in which the contact pressures at raft edges are higher than that at the middle.
  • It is possible to refine the mesh in a specified region such as around supports, springs, and piles to present the concentration of stress, moment, and settlement in this region (Figure 48).
  • By selecting the "Merge Nets" command from the "Arrange" group, two or more nets (Figure 50) can be combined into a net, Figure 49.
  • By selecting the "Split Net" command from the "Arrange" group, the FE-Net (Figure 49) can be divided into two or more nets, Figure 50.
  • Reference points, reference lines, reference corners, Reference polylines, and curves (Figure 51) can be imported into ELPLA from a DXF file (AutoCAD Drawing Exchange File), Figure 52.
  • The user can generate a finite element mesh using the AutoCAD command as "3DFACE", Figure 53. 3D Face can be imported into ELPLA, Figure 54.
    An existed FE-Net can be added to the current "FE-Net". This option enables the user to analyze a system of many foundations together in one combined FE-Net, Figure 55.