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Finite Element Analysis Using MATLAB Toolbox

AppendixDFinite Element Analysis UsingMATLAB ToolboxIn this section, a MATLAB3toolbox CALFEM4is introduced. This Toolbox is developedby Lund University in 1999 and can be downloaded free of charge from CALFEM provides functions that can be used for Finite elementanalysis of a variety of structures. Compared to other Finite Element programs, this tool-box has many advantages for education. Many commercial programs automatically per-form Finite Element process. Thus, the users do not understand the process of constructingelement stiffness matrices, assembling them, and applying boundary conditions. In thistoolbox, however, the users must provide every step of Finite Element process. The tool-box then provides functions that can perform particular step of Finite Element general, MATLAB toolboxes are stored in the Toolbox folder in MATLAB instal-lation folder. In order to access the Toolbox , the user must provide path information usingFile, Set Path.

392 Chapter D Finite Element Analysis Using MATLAB Toolbox. In order to assemble the element stiffness matrix into the global stiffness matrix, it is necessary to specify the relation between the local DOFs in the global DOFs. This infor-mation is stored in Edofarray. Thus, the first argument of ‘‘assem’’ function is the row

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