Couple a FORTRAN library with Strurel (MinGW-compiler)

The latest version of Sturel allows you to couple external libraries with the application. In this post we show how to link a limit-state function written in FORTRAN to Comrel. As compiler we employ a variant of the free MinGW compiler (

Install the 64-bit MinGW compiler

First, you have to download the installer mingw-w64-install.exe from Thereafter, please execute the downloaded installer and select x86-64 as architecture (you do not have to modify the other settings).

Compile the FORTRAN limit-state function

We assume that you implemented your limit-state function of interest in FORTRAN. A FORTRAN limit-state function that you can use as template can be downloaded from:

In this tutorial, we will directly compile the above mentioned file. The function is compiled using the Windows command prompt (cmd.exe). In the command prompt, first go to the installation directory of mingw-w64 (you can change directories with the command cd) and execute the bat-file mingw-w64.bat. Thereafter, to the folder containing the FORTRAN limit-state function and execute the following commands:

gfortran -fno-underscoring -c Module.for
gfortran -O3 -shared -o FORDLL.dll Module.o

where Module.for is the name of the FORTRAN file to compile and FORDLL.dll is the name of the DLL-library to generate.

If you do not have the FORTRAN compiler installed, you can download the compiled library from:

Load the compiled library in Comrel

If you compiled the above mentioned template file without modifications, you can download the file Comrel file Pressure-Vessel.iti from:
Put the file in the same folder as the compiled library (e.g., FORDLL.dll), and open the file with Comrel to see how the library can be used to perform a reliability analysis.


Presented RELY at the SOFiSTiK Seminar

The 25th SOFiSTiK Seminar took place on Friday and Saturday last week. We presented the SOFiSTiK module RELY, a coupling of the kernel of Strurel with the finite element package SOFiSTiK.

Abstract: RELY is a novel SOFiSTiK module for reliability analysis. It allows to employ the full capabilities of the SOFiSTiK finite element package to model the engineering system of interest, in combination with a powerful stochastic model and analysis toolbox. The kernel of RELY is powered by Strurel, one of the leading reliability software tools.
We show how to apply RELY to perform reliability analysis of a conventionally driven tunnel. Model parameters that are subject to considerable uncertainty are represented stochastically. The first-order reliability method (FORM) is employed to estimate the reliability of the outer tunnel lining. Sensitivity information provided by FORM is used to quantify the relative importance of the stochastic model parameters.