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[SEAOC] MATS, etc. Software[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: [SEAOC] MATS, etc. Software
- From: BRBATES(--nospam--at)aol.com
- Date: Tue, 10 Sep 1996 14:42:49 -0400
An important consideration when evaluating software for mat foundation analysis is whether the finite element used is a THICK plate/shell element. In other words, does it accurately model out of plane (transverse) shear. The MATS program actually uses a THIN plate element(!), which may cause serious accuracy problems. Be sure that the program you're looking at does use an element that accurately models transverse shear; otherwise your results may be meaningless. GTSTRUDL, SAP90, SAFE and RISA-3D are some examples of programs with THICK plate/shell elements that accurately model transverse shear and thus are well suited for mat foundation analysis. The VisualAnalysis program mentioned in a prior posting uses a THIN plate formulation. I'm not familiar with the AnalysisGroup product (from the same company as VisualAnalysis), so I don't know what element they use in that product. Here's a simple test problem you can use to test a plate element for tranverse shear accuracy. Imagine a simply supported 10' beam with a 3'x3' cross section. Model this using a 10x3 grid of plate elements. This gives you a mesh of 1'x1' elements 3' thick (a very thick element). Apply a surface load of 1k/ft**2 to the plates. Now check the total shear at a distance of 6" from the support edge. This would be the center point for the three elements at the end. This shear should sum to 13.5 K. Bruce Bates ...
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