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Planar Truss Example for Comrel Add-on RCP Consult, 2023-2025 Page 1The Planar Truss Example for Comrel-TI as Fortran based Add-onHere, a Strurel Add-Ons (*.sao) are described with the state function programmed inFORTRAN for Comrel-TI based on the more sophisticated example %u201cPlanar Truss%u201d from the paper Response surface augmented moment method for efficient reliability analysis. The collection of several files (input, FORTRAN source files and description) stored into two files FortranPlanarTrussGFOR.sao and FortranPlanarTrussGF90.sao using the STRUREL Add-on Creator 2 with binding to GNU Fortran compiler is briefly described. This example requires already sufficient familiarity with the theory underlying Comrel. It is therefore recommended that the user not familiar with the concepts and methods consultsInteractive Use and at least one Introductory example first. Additionally, a certain experience of programming in FORTRAN is required.Attention %u2013 to operate with data from FortranPlanarTrussGFOR.sao and FortranPlanarTrussGF90.sao your Comrel-TI distribution must contain the standard FORTRAN Interface as the file StrurelToFortran.sao.The Mechanical and Stochastic ModelThe definition of a problem to be analyzed by Comrel-TI is given by the state function and the input of the necessary data on one binary file (*.bti). Output from Comrel-TI will be on several files explained below.First the state function definition is described. Then the definition and input preparation of the stochastic model as well as the further program control data by means of the Windows based interactive pre- and post-processor Comrel will be explained.Next, run time and short output information to screen of this example are explained. Finally, the results of the post-processing part of Comrel are discussed.Figure: Planar Truss geometry and loading.We consider a planar truss that consists of 23 rods as depicted in Figure above. Horizontal and diagonal rods have cross-sections A1, A2 and Young%u2019s moduli E1, E2, respectively. The truss sustains 6 vertical point loads P1 - P6. The variables X = [A1; A2; E1; E2; P1; . . . ; P6] are